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Socrates affirms a belief in gods in Plato's "Apology", where he says to the jurors that he acknowledges gods more than his accusers. For Plato's Socrates, the existence of gods is taken for granted; in none of his dialogues does he probe whether gods exist or not. In "Apology", a case for Socrates being agnostic can be made, based on his discussion of the great unknown after death, and in "Phaedo" (the dialogue with his students in his last day) Socrates gives expression to a clear belief in the immortality of the soul. He also believed in oracles, divinations and other messages from gods. These signs did not offer him any positive belief on moral issues; rather, they were predictions of unfavorable future events.
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In Xenophon's "Memorabilia", Socrates constructs an argument close to the contemporary teleological intelligent-design argument. He claims that since there are many features in the universe that exhibit "signs of forethought" (e.g., eyelids), a divine creator must have created the universe. He then deduces that the creator should be omniscient and omnipotent and also that it created the universe for the advance of humankind, since humans naturally have many abilities that other animals do not. At times, Socrates speaks of a single deity, while at other times he refers to plural "gods". This has been interpreted to mean that he either believed that a supreme deity commanded other gods, or that various gods were parts, or manifestations, of this single deity.
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It has been a source of puzzlement how Socrates's religious beliefs can be consistent with his strict adherence to rationalism. Philosophy professor Mark McPherran suggests that Socrates interpreted every divine sign through secular rationality for confirmation. Professor of ancient philosophy A. A. Long suggests that it is anachronistic to suppose that Socrates believed the religious and rational realms were separate.
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In several texts (e.g., Plato's "Euthyphro" 3b5; "Apology" 31c–d; Xenophon's "Memorabilia" 1.1.2) Socrates claims he hears a daimōnic sign—an inner voice heard usually when he was about to make a mistake. Socrates gave a brief description of this daimonion at his trial ("Apology" 31c–d): "...The reason for this is something you have heard me frequently mention in different places—namely, the fact that I experience something divine and daimonic, as Meletus has inscribed in his indictment, by way of mockery. It started in my childhood, the occurrence of a particular voice. Whenever it occurs, it always deters me from the course of action I was intending to engage in, but it never gives me positive advice. It is this that has opposed my practicing politics, and I think its doing so has been absolutely fine." Modern scholarship has variously interpreted this Socratic "daimōnion" as a rational source of knowledge, an impulse, a dream or even a paranormal experience felt by an ascetic Socrates.
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Socrates's theory of virtue states that all virtues are essentially one, since they are a form of knowledge. For Socrates, the reason a person is not good is because they lack knowledge. Since knowledge is united, virtues are united as well. Another famous dictum— "no one errs willingly"—also derives from this theory. In "Protagoras", Socrates argues for the unity of virtues using the example of courage: if someone knows what the relevant danger is, they can undertake a risk. Aristotle comments: " ... Socrates the elder thought that the end of life was knowledge of virtue, and he used to seek for the definition of justice, courage, and each of the parts of virtue, and this was a reasonable approach, since he thought that all virtues were sciences, and that as soon as one knew [for example] justice, he would be just..."
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Some texts suggest that Socrates had love affairs with Alcibiades and other young persons; others suggest that Socrates's friendship with young boys sought only to improve them and were not sexual. In "Gorgias", Socrates claims he was a dual lover of Alcibiades and philosophy, and his flirtatiousness is evident in "Protagoras", "Meno" (76a–c) and "Phaedrus" (227c–d). However, the exact nature of his relationship with Alcibiades is not clear; Socrates was known for his self-restraint, while Alcibiades admits in the "Symposium" that he had tried to seduce Socrates but failed.
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The Socratic theory of love is mostly deduced from "Lysis", where Socrates discusses love at a wrestling school in the company of Lysis and his friends. They start their dialogue by investigating parental love and how it manifests with respect to the freedom and boundaries that parents set for their children. Socrates concludes that if Lysis is utterly useless, nobody will love him—not even his parents. While most scholars believe this text was intended to be humorous, it has also been suggested that "Lysis" shows Socrates held an egoistic view of love, according to which we only love people who are useful to us in some way. Other scholars disagree with this view, arguing that Socrates's doctrine leaves room for non-egoistic love for a spouse; still others deny that Socrates suggests any egoistic motivation at all. In "Symposium", Socrates argues that children offer the false impression of immortality to their parents, and this misconception yields a form of unity among them. Scholars also note that for Socrates, love is rational.
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It is notable that Socrates, who claims to know only that he does not know, makes an exception (in Plato's "Symposium"), where he says he will tell the truth about Love, which he learned from a 'clever woman'. Classicist Armand D'Angour has made the case that Socrates was in his youth close to Aspasia, and that Diotima, to whom Socrates attributes his understanding of love in "Symposium", is based on her; however, it is also possible that Diotima really existed.
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While Socrates was involved in public political and cultural debates, it is hard to define his exact political philosophy. In Plato's "Gorgias," he tells Callicles: "I believe that I'm one of a few Athenians—so as not to say I'm the only one, but the only one among our contemporaries—to take up the true political craft and practice the true politics. This is because the speeches I make on each occasion do not aim at gratification but at what's best." His claim illustrates his aversion for the established democratic assemblies and procedures such as voting—since Socrates saw politicians and rhetoricians as using tricks to mislead the public. He never ran for office or suggested any legislation. Rather, he aimed to help the city flourish by "improving" its citizens. As a citizen, he abided by the law. He obeyed the rules and carried out his military duty by fighting wars abroad. His dialogues, however, make little mention of contemporary political decisions, such as the Sicilian Expedition.
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Socrates spent his time conversing with citizens, among them powerful members of Athenian society, scrutinizing their beliefs and bringing the contradictions of their ideas to light. Socrates believed he was doing them a favor since, for him, politics was about shaping the moral landscape of the city through philosophy rather than electoral procedures. There is a debate over where Socrates stood in the polarized Athenian political climate, which was divided between oligarchs and democrats. While there is no clear textual evidence, one widely held theory holds that Socrates leaned towards democracy: he disobeyed the one order that the oligarchic government of the Thirty Tyrants gave him; he respected the laws and political system of Athens (which were formulated by democrats); and, according to this argument, his affinity for the ideals of democratic Athens was a reason why he did not want to escape prison and the death penalty. On the other hand, there is some evidence that Socrates leaned towards oligarchy: most of his friends supported oligarchy, he was contemptuous of the opinion of the many and was critical of the democratic process, and "Protagoras" shows some anti-democratic elements. A less mainstream argument suggests that Socrates favoured democratic republicanism, a theory that prioritizes active participation in public life and concern for the city.
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Yet another suggestion is that Socrates endorsed views in line with liberalism, a political ideology formed in the Age of Enlightenment. This argument is mostly based on "Crito" and "Apology", where Socrates talks about the mutually beneficial relationship between the city and its citizens. According to Socrates, citizens are morally autonomous and free to leave the city if they wish—but, by staying within the city, they also accept the laws and the city's authority over them. On the other hand, Socrates has been seen as the first proponent of civil disobedience. Socrates's strong objection to injustice, along with his refusal to serve the Thirty Tyrants' order to arrest Leon, are suggestive of this line. As he says in "Critias", "One ought never act unjustly, even to repay a wrong that has been done to oneself." Ιn the broader picture, Socrates's advice would be for citizens to follow the orders of the state, unless, after much reflection, they deem them to be unjust.
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Socrates's impact was immense in philosophy after his death. With the exception of the Epicureans and the Pyrrhonists, almost all philosophical currents after Socrates traced their roots to him: Plato's Academy, Aristotle's Lyceum, the Cynics, and the Stoics. Interest in Socrates kept increasing until the third century AD. The various schools differed in response to fundamental questions such as the purpose of life or the nature of "arete" (virtue), since Socrates had not handed them an answer, and therefore, philosophical schools subsequently diverged greatly in their interpretation of his thought. He was considered to have shifted the focus of philosophy from a study of the natural world, as was the case for pre-Socratic philosophers, to a study of human affairs.
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Immediate followers of Socrates were his pupils, Euclid of Megara, Aristippus, and Antisthenes, who drew differing conclusions among themselves and followed independent trajectories. The full doctrines of Socrates's pupils are difficult to reconstruct. Antisthenes had a profound contempt of material goods. According to him, virtue was all that mattered. Diogenes and the Cynics continued this line of thought. On the opposite end, Aristippus endorsed the accumulation of wealth and lived a luxurious life. After leaving Athens and returning to his home city of Cyrene, he founded the Cyrenaic philosophical school which was based on hedonism, and endorsing living an easy life with physical pleasures. His school passed to his grandson, bearing the same name. There is a dialogue in Xenophon's work in which Aristippus claims he wants to live without wishing to rule or be ruled by others. In addition, Aristippus maintained a skeptical stance on epistemology, claiming that we can be certain only of our own feelings. This view resonates with the Socratic understanding of ignorance. Euclid was a contemporary of Socrates. After Socrates's trial and death, he left Athens for the nearby town of Megara, where he founded a school, named the Megarians. His theory was built on the pre-Socratic monism of Parmenides. Euclid continued Socrates's thought, focusing on the nature of virtue.
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The Stoics relied heavily on Socrates. They applied the Socratic method as a tool to avoid inconsistencies. Their moral doctrines focused on how to live a smooth life through wisdom and virtue. The Stoics assigned virtue a crucial role in attaining happiness and also prioritized the relation between goodness and ethical excellence, all of which echoed Socratic thought. At the same time, the philosophical current of Platonism claimed Socrates as its predecessor, in ethics and in its theory of knowledge. Arcesilaus, who became the head of the Academy about 80 years after its founding by Plato, radically changed the Academy's doctrine to what is now known as Academic Skepticism, centered on the Socratic philosophy of ignorance. The Academic Skeptics competed with the Stoics over who was Socrates's true heir with regard to ethics. While the Stoics insisted on knowledge-based ethics, Arcesilaus relied on Socratic ignorance. The Stoics' reply to Arcesilaus was that Socratic ignorance was part of Socratic irony (they themselves disapproved the use of irony), an argument that ultimately became the dominant narrative of Socrates in later antiquity.
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While Aristotle considered Socrates an important philosopher, Socrates was not a central figure in Aristotelian thought. One of Aristotle's pupils, Aristoxenus even authored a book detailing Socrates's scandals.
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The Epicureans were antagonistic to Socrates. They attacked him for superstition, criticizing his belief in his "daimonion" and his regard for the oracle at Delphi. They also criticized Socrates for his character and various faults, and focusing mostly on his irony, which was deemed inappropriate for a philosopher and unseemly for a teacher.
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The Pyrrhonists were also antagonistic to Socrates, accusing him of being a prater about ethics, who engaged in mock humility, and who sneered at and mocked people.
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Socratic thought found its way to the Islamic Middle East alongside that of Aristotle and the Stoics. Plato's works on Socrates, as well as other ancient Greek literature, were translated into Arabic by early Muslim scholars such as Al-Kindi, Jabir ibn Hayyan, and the Muʿtazila. For Muslim scholars, Socrates was hailed and admired for combining his ethics with his lifestyle, perhaps because of the resemblance in this regard with Muhammad's personality. Socratic doctrines were altered to match Islamic faith: according to Muslim scholars, Socrates made arguments for monotheism and for the temporality of this world and rewards in the next life. His influence in the Arabic-speaking world continues to the present day.
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In medieval times, little of Socrates's thought survived in the Christian world as a whole; however, works on Socrates from Christian scholars such as Lactantius, Eusebius and Augustine were maintained in the Byzantine Empire, where Socrates was studied under a Christian lens. After the fall of Constantinople, many of the texts were brought back into the world of Roman Christianity, where they were translated into Latin. Overall, ancient Socratic philosophy, like the rest of classical literature before the Renaissance, was addressed with skepticism in the Christian world at first.
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During the early Italian Renaissance, two different narratives of Socrates developed. On the one hand, the humanist movement revived interest in classical authors. Leonardo Bruni translated many of Plato's Socratic dialogues, while his pupil Giannozzo Manetti authored a well-circulated book, a "Life of Socrates". They both presented a civic version of Socrates, according to which Socrates was a humanist and a supporter of republicanism. Bruni and Manetti were interested in defending secularism as a non-sinful way of life; presenting a view of Socrates that was aligned with Christian morality assisted their cause. In doing so, they had to censor parts of his dialogues, especially those which appeared to promote homosexuality or any possibility of pederasty (with Alcibiades), or which suggested that the Socratic "daimon" was a god. On the other hand, a different picture of Socrates was presented by Italian Neoplatonists, led by the philosopher and priest Marsilio Ficino. Ficino was impressed by Socrates's un-hierarchical and informal way teaching, which he tried to replicate. Ficino portrayed a holy picture of Socrates, finding parallels with the life of Jesus Christ. For Ficino and his followers, Socratic ignorance signified his acknowledgement that all wisdom is God-given (through the Socratic "daimon").
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In early modern France, Socrates's image was dominated by features of his private life rather than his philosophical thought, in various novels and satirical plays. Some thinkers used Socrates to highlight and comment upon controversies of their own era, like Théophile de Viau who portrayed a Christianized Socrates accused of atheism, while for Voltaire, the figure of Socrates represented a reason-based theist. Michel de Montaigne wrote extensively on Socrates, linking him to rationalism as a counterweight to contemporary religious fanatics.
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In the 18th century, German idealism revived philosophical interest in Socrates, mainly through Hegel's work. For Hegel, Socrates marked a turning point in the history of humankind by the introduction of the principle of free subjectivity or self-determination. While Hegel hails Socrates for his contribution, he nonetheless justifies the Athenian court, for Socrates's insistence upon self-determination would be destructive of the "Sittlichkeit" (a Hegelian term signifying the way of life as shaped by the institutions and laws of the State). Also, Hegel sees the Socratic use of rationalism as a continuation of Protagoras' focus on human reasoning (as encapsulated in the motto "homo mensura": "man is the measure of all things"), but modified: it is our reasoning that can help us reach objective conclusions about reality. Also, Hegel considered Socrates as a predecessor of later ancient skeptic philosophers, even though he never clearly explained why.
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Søren Kierkegaard considered Socrates his teacher, and authored his master's thesis on him, "The Concept of Irony with Continual Reference to Socrates". There he argues that Socrates is not a moral philosopher but is purely an ironist. He also focused on Socrates's avoidance of writing: for Kierkegaard, this avoidance was a sign of humility, deriving from Socrates's acceptance of his ignorance. Not only did Socrates not write anything down, according to Kierkegaard, but his contemporaries misconstrued and misunderstood him as a philosopher, leaving us with an almost impossible task in comprehending Socratic thought. Only Plato's "Apology" was close to the real Socrates, in Kierkegaard's view. In his writings, he revisited Socrates quite frequently; in his later work, Kierkegaard found ethical elements in Socratic thought. Socrates was not only a subject of study for Kierkegaard, he was a model as well: Kierkegaard paralleled his task as a philosopher to Socrates. He writes, "The only analogy I have before me is Socrates; my task is a Socratic task, to audit the definition of what it is to be a Christian", with his aim being to bring society closer to the Christian ideal, since he believed that Christianity had become a formality, void of any Christian essence. Kierkegaard denied being a Christian, as Socrates denied possessing any knowledge.
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Friedrich Nietzsche resented Socrates's contributions to Western culture. In his first book, "The Birth of Tragedy" (1872), Nietzsche held Socrates responsible for what he saw as the deterioration of ancient Greek civilization during the 4th century BC and after. For Nietzsche, Socrates turned the scope of philosophy from pre-Socratic naturalism to rationalism and intellectualism. He writes: "I conceive of [the Presocratics] as precursors to a reformation of the Greeks: but not of Socrates"; "with Empedocles and Democritus the Greeks were well on their way towards taking the correct measure of human existence, its unreason, its suffering; they never reached this goal, thanks to Socrates". The effect, Nietzsche proposed, was a perverse situation that had continued down to his day: our culture is a Socratic culture, he believed. In a later publication, "The Twilight of the Idols" (1887), Nietzsche continued his offensive against Socrates, focusing on the arbitrary linking of reason to virtue and happiness in Socratic thinking. He writes: "I try to understand from what partial and idiosyncratic states the Socratic problem is to be derived: his equation of reason = virtue = happiness. It was with this absurdity of a doctrine of identity that he fascinated: ancient philosophy never again freed itself [from this fascination]". From the late 19th century until the early 20th, the most common explanation of Nietzsche's hostility towards Socrates was his anti-rationalism; he considered Socrates the father of European rationalism. In the mid-20th century, philosopher Walter Kaufmann published an article arguing that Nietzsche admired Socrates. Current mainstream opinion is that Nietzsche was ambivalent towards Socrates.
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Continental philosophers Hannah Arendt, Leo Strauss and Karl Popper, after experiencing the horrors of World War II, amidst the rise of totalitarian regimes, saw Socrates as an icon of individual conscience. Arendt, in "Eichmann in Jerusalem" (1963), suggests that Socrates's constant questioning and self-reflection could prevent the banality of evil. Strauss considers Socrates's political thought as paralleling Plato's. He sees an elitist Socrates in Plato's "Republic" as exemplifying why the "polis" is not, and could not be, an ideal way of organizing life, since philosophical truths cannot be digested by the masses. Popper takes the opposite view: he argues that Socrates opposes Plato's totalitarian ideas. For Popper, Socratic individualism, along with Athenian democracy, imply Popper's concept of the "open society" as described in his "Open Society and Its Enemies" (1945).
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Chess is a board game between two players. It is sometimes called international chess or Western chess to distinguish it from related games, such as xiangqi (Chinese chess) and shogi (Japanese chess). The current form of the game emerged in Spain and the rest of Southern Europe during the second half of the 15th century after evolving from chaturanga, a similar but much older game of Indian origin. Today, chess is one of the world's most popular games, played by millions of people worldwide.
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Chess is an abstract strategy game and involves no hidden information. It is played on a chessboard with 64 squares arranged in an eight-by-eight grid. At the start, each player controls sixteen pieces: one king, one queen, two rooks, two bishops, two knights, and eight pawns. The player controlling the white pieces moves first, followed by the player controlling the black pieces. The object of the game is to checkmate the opponent's king, whereby the king is under immediate attack (in "check") and there is no way for it to escape. There are also several ways a game can end in a draw.
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Organized chess arose in the 19th century. Chess competition today is governed internationally by FIDE (International Chess Federation). The first universally recognized World Chess Champion, Wilhelm Steinitz, claimed his title in 1886; Magnus Carlsen is the current World Champion. A huge body of chess theory has developed since the game's inception. Aspects of art are found in chess composition, and chess in its turn influenced Western culture and art, and has connections with other fields such as mathematics, computer science, and psychology.
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One of the goals of early computer scientists was to create a chess-playing machine. In 1997, Deep Blue became the first computer to beat the reigning World Champion in a match when it defeated Garry Kasparov. Today's chess engines are significantly stronger than the best human players and have deeply influenced the development of chess theory.
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The rules of chess are published by FIDE (Fédération Internationale des Échecs), chess's international governing body, in its "Handbook". Rules published by national governing bodies, or by unaffiliated chess organizations, commercial publishers, etc., may differ in some details. FIDE's rules were most recently revised in 2018.
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Chess pieces are divided into two different colored sets. While the sets may not be literally white and black (e.g. the light set may be a yellowish or off-white color, the dark set may be brown or red), they are always referred to as "white" and "black". The players of the sets are referred to as and , respectively. Each set consists of 16 pieces: one king, one queen, two rooks, two bishops, two knights, and eight pawns. Chess sets come in a wide variety of styles; for competition, the Staunton pattern is preferred.
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The game is played on a square board of eight rows (called ) and eight columns (called ). By convention, the 64 squares alternate in color and are referred to as and squares; common colors for chessboards are white and brown, or white and dark green.
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The pieces are set out as shown in the diagram and photo. Thus, on White's first rank, from left to right, the pieces are placed in the following order: rook, knight, bishop, queen, king, bishop, knight, rook. On the second rank is placed a row of eight pawns. Black's position mirrors White's, with an equivalent piece on the same file. The board is placed with a light square at the right-hand corner nearest to each player. The correct positions of the king and queen may be remembered by the phrase "queen on her own color" ─ i.e. the white queen begins on a light square and the black queen on a dark square.
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In competitive games, the piece colors are allocated to players by the organizers; in informal games, the colors are usually decided randomly, for example by a coin toss, or by one player concealing a white pawn in one hand and a black pawn in the other, and having the opponent choose.
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White moves first, after which players alternate turns, moving one piece per turn, except for castling, when two pieces are moved. A piece is moved to either an unoccupied square or one occupied by an opponent's piece, which is captured and removed from play. With the sole exception of "en passant", all pieces capture by moving to the square that the opponent's piece occupies. Moving is compulsory; a player may not skip a turn, even when having to move is detrimental.
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Each piece has its own way of moving. In the diagrams, the dots mark the squares to which the piece can move if there are no intervening piece(s) of either color (except the knight, which leaps over any intervening pieces). All pieces except the pawn can capture an enemy piece if it is located on a square to which they would be able to move if the square was unoccupied. The squares on which pawns can capture enemy pieces are marked in the diagram with black crosses.
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When a king is under immediate attack, it is said to be . A move in response to a check is legal only if it results in a position where the king is no longer in check. This can involve capturing the checking piece; interposing a piece between the checking piece and the king (which is possible only if the attacking piece is a queen, rook, or bishop and there is a square between it and the king); or moving the king to a square where it is not under attack. Castling is not a permissible response to a check.
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The object of the game is to checkmate the opponent; this occurs when the opponent's king is in check, and there is no legal way to get it out of check. It is never legal for a player to make a move that puts or leaves the player's own king in check. In casual games, it is common to announce "check" when putting the opponent's king in check, but this is not required by the rules of chess and is not usually done in tournaments.
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Once per game, each king can make a move known as . Castling consists of moving the king two squares toward a rook of the same color on the same rank, and then placing the rook on the square that the king crossed.
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When a pawn makes a two-step advance from its starting position and there is an opponent's pawn on a square next to the destination square on an adjacent file, then the opponent's pawn can capture it "en passant" ("in passing"), moving to the square the pawn passed over. This can be done only on the turn immediately following the enemy pawn's two-square advance; otherwise, the right to do so is forfeited. For example, in the animated diagram, the black pawn advances two squares from g7 to g5, and the white pawn on f5 can take it "en passant" on g6 (but only immediately after the black pawn's advance).
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When a pawn advances to its eighth rank, as part of the move, it is and must be exchanged for the player's choice of queen, rook, bishop, or knight of the same color. Usually, the pawn is chosen to be promoted to a queen, but in some cases, another piece is chosen; this is called underpromotion. In the animated diagram, the pawn on c7 can be advanced to the eighth rank and be promoted. There is no restriction on the piece promoted to, so it is possible to have more pieces of the same type than at the start of the game (e.g., two or more queens). If the required piece is not available (e.g. a second queen) an inverted rook is sometimes used as a substitute, but this is not recognized in FIDE-sanctioned games.
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In competition, chess games are played with a time control. If a player's time runs out before the game is completed, the game is automatically lost (provided the opponent has to deliver checkmate). The duration of a game ranges from long (or "classical") games, which can take up to seven hours (even longer if adjournments are permitted), to bullet chess (under 3 minutes per player for the entire game). Intermediate between these are rapid chess games, lasting between one and two hours per game, a popular time control in amateur weekend tournaments.
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Time is controlled using a chess clock that has two displays, one for each player's remaining time. Analog chess clocks have been largely replaced by digital clocks, which allow for time controls with increments.
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Time controls are also enforced in correspondence chess competitions. A typical time control is 50 days for every 10 moves.
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Historically, many different notation systems have been used to record chess moves; the standard system today is short-form algebraic notation. In this system, each square is uniquely identified by a set of coordinates, – for the files followed by – for the ranks. The usual format is:
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The pieces are identified by their initials. In English, these are (king), (queen), (rook), (bishop), and (knight; N is used to avoid confusion with king). For example, Qg5 means "queen moves to the g-file, 5th rank" (that is, to the square g5). Different initials may be used for other languages. In chess literature figurine algebraic notation (FAN) is frequently used to aid understanding independent of language.
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To resolve ambiguities, an additional letter or number is added to indicate the file or rank from which the piece moved (e.g. Ngf3 means "knight from the g-file moves to the square f3"; R1e2 means "rook on the first rank moves to e2"). For pawns, no letter initial is used; so e4 means "pawn moves to the square e4".
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If the piece makes a capture, "x" is usually inserted before the destination square. Thus Bxf3 means "bishop captures on f3". When a pawn makes a capture, the file from which the pawn departed is used to identify the pawn making the capture, for example, exd5 (pawn on the e-file captures the piece on d5). Ranks may be omitted if unambiguous, for example, exd (pawn on the e-file captures a piece somewhere on the d-file). A minority of publications use ":" to indicate a capture, and some omit the capture symbol altogether. In its most abbreviated form, exd5 may be rendered simply as ed. An "en passant" capture may optionally be marked with the notation "e.p."
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If a pawn moves to its last rank, achieving promotion, the piece chosen is indicated after the move (for example, e1=Q or e1Q). Castling is indicated by the special notations 0-0 (or O-O) for castling and 0-0-0 (or O-O-O) for castling. A move that places the opponent's king in check usually has the notation "+" added. There are no specific notations for discovered check or double check. Checkmate can be indicated by "#". At the end of the game, "1–0" means White won, "0–1" means Black won, and "½–½" indicates a draw.
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Chess moves can be annotated with punctuation marks and other symbols. For example: "!" indicates a good move; "!!" an excellent move; "?" a mistake; "??" a blunder; "!?" an interesting move that may not be best; or "?!" a dubious move not easily refuted.
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For example, one variation of a simple trap known as the Scholar's mate (see animated diagram) can be recorded:
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Variants of algebraic notation include long form algebraic, in which both the departure and destination square are indicated; abbreviated algebraic, in which capture signs, check signs, and ranks of pawn captures may be omitted; and Figurine Algebraic Notation, used in chess publications for universal readability regardless of language.
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Portable Game Notation (PGN) is a text-based file format for recording chess games, based on short form English algebraic notation with a small amount of markup. PGN files (suffix .pgn) can be processed by most chess software, as well as being easily readable by humans.
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Until about 1980, the majority of English language chess publications used descriptive notation, in which files are identified by the initial letter of the piece that occupies the first rank at the beginning of the game. In descriptive notation, the common opening move 1.e4 is rendered as "1.P-K4" ("pawn to king four"). Another system is ICCF numeric notation, recognized by the International Correspondence Chess Federation though its use is in decline.
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In competitive games, players are normally required to keep a score (record of the game). For this purpose, only algebraic notation is recognized in FIDE-sanctioned events; game scores recorded in a different notation system may not be used as evidence in the event of a dispute.
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Contemporary chess is an organized sport with structured international and national leagues, tournaments, and congresses. Thousands of chess tournaments, matches, and festivals are held around the world every year catering to players of all levels.
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Tournaments with a small number of players may use the round-robin format, in which every player plays one game against every other player. For a large numbers of players, the Swiss system may be used, in which each player is paired against an opponent who has the same (or as similar as possible) score in each round. In either case, a player's score is usually calculated as 1 point for each game won and one-half point for each game drawn. Variations such as "football scoring" (3 points for a win, 1 point for a draw) may be used by tournament organizers, but ratings are always calculated on the basis of standard scoring. There are different ways to denote a player's score in a match or tournament, most commonly: P/G (points scored out of games played, e.g. 5½/8); P–A (points for and points against, e.g. 5½–2½); or +W−L=D (W wins, L losses, D draws, e.g. +4−1=3).
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The term "" refers not to an individual game, but to either a series of games between two players, or a team competition in which each player of one team plays one game against a player of the other team.
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Chess's international governing body is usually known by its French acronym FIDE (pronounced FEE-day) (French: Fédération internationale des échecs), or International Chess Federation. FIDE's membership consists of the national chess organizations of over 180 countries; there are also several associate members, including various supra-national organizations, the International Braille Chess Association (IBCA), International Committee of Chess for the Deaf (ICCD), and the International Physically Disabled Chess Association (IPCA). FIDE is recognized as a sports governing body by the International Olympic Committee, but chess has never been part of the Olympic Games.
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FIDE's most visible activity is organizing the World Chess Championship, a role it assumed in 1948. The current World Champion is Magnus Carlsen of Norway. The reigning Women's World Champion is Ju Wenjun from China.
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Other competitions for individuals include the World Junior Chess Championship, the European Individual Chess Championship, the tournaments for the World Championship qualification cycle, and the various national championships. Invitation-only tournaments regularly attract the world's strongest players. Examples include Spain's Linares event, Monte Carlo's Melody Amber tournament, the Dortmund Sparkassen meeting, Sofia's M-tel Masters, and Wijk aan Zee's Tata Steel tournament.
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The World Chess Solving Championship and World Correspondence Chess Championships include both team and individual events; these are held independently of FIDE.
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In order to rank players, FIDE, ICCF, and most national chess organizations use the Elo rating system developed by Arpad Elo. An average club player has a rating of about 1500; the highest FIDE rating of all time, 2882, was achieved by Magnus Carlsen on the March 2014 FIDE rating list.
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The above titles are open to both men and women. There are also separate women-only titles; Woman Grandmaster (WGM), Woman International Master (WIM), Woman FIDE Master (WFM) and Woman Candidate Master (WCM). These require a performance level approximately 200 Elo rating points below the similarly named open titles, and their continued existence has sometimes been controversial. Beginning with Nona Gaprindashvili in 1978, a number of women have earned the open GM title.
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FIDE also awards titles for arbiters and trainers. International titles are also awarded to composers and solvers of chess problems and to correspondence chess players (by the International Correspondence Chess Federation). National chess organizations may also award titles.
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Chess has an extensive literature. In 1913, the chess historian H.J.R. Murray estimated the total number of books, magazines, and chess columns in newspapers to be about 5,000. B.H. Wood estimated the number, as of 1949, to be about 20,000. David Hooper and Kenneth Whyld write that, "Since then there has been a steady increase year by year of the number of new chess publications. No one knows how many have been printed." Significant public chess libraries include the John G. White Chess and Checkers Collection at Cleveland Public Library, with over 32,000 chess books and over 6,000 bound volumes of chess periodicals; and the Chess & Draughts collection at the National Library of the Netherlands, with about 30,000 books.
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Chess theory usually divides the game of chess into three phases with different sets of strategies: the opening, typically the first 10 to 20 moves, when players move their pieces to useful positions for the coming battle; the middlegame; and last the endgame, when most of the pieces are gone, kings typically take a more active part in the struggle, and pawn promotion is often decisive.
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A chess opening is the group of initial moves of a game (the "opening moves"). Recognized sequences of opening moves are referred to as and have been given names such as the Ruy Lopez or Sicilian Defense. They are catalogued in reference works such as the "Encyclopaedia of Chess Openings". There are dozens of different openings, varying widely in character from quiet (for example, the Réti Opening) to very aggressive (the Latvian Gambit). In some opening lines, the exact sequence considered best for both sides has been worked out to more than 30 moves. Professional players spend years studying openings and continue doing so throughout their careers, as opening theory continues to evolve.
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Most players and theoreticians consider that White, by virtue of the first move, begins the game with a small advantage. This initially gives White the initiative. Black usually strives to neutralize White's advantage and achieve , or to develop in an unbalanced position.
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The middlegame is the part of the game which starts after the opening. There is no clear line between the opening and the middlegame, but typically the middlegame will start when most pieces have been developed. (Similarly, there is no clear transition from the middlegame to the endgame; see start of the endgame.) Because the opening theory has ended, players have to form plans based on the features of the position, and at the same time take into account the tactical possibilities of the position. The middlegame is the phase in which most combinations occur. Combinations are a series of tactical moves executed to achieve some gain. Middlegame combinations are often connected with an attack against the opponent's king. Some typical patterns have their own names; for example, the Boden's Mate or the Lasker–Bauer combination.
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Specific plans or strategic themes will often arise from particular groups of openings which result in a specific type of pawn structure. An example is the , which is the attack of queenside pawns against an opponent who has more pawns on the queenside. The study of openings is therefore connected to the preparation of plans that are typical of the resulting middlegames.
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Another important strategic question in the middlegame is whether and how to reduce material and transition into an endgame (i.e. ). Minor material advantages can generally be transformed into victory only in an endgame, and therefore the stronger side must choose an appropriate way to achieve an ending. Not every reduction of material is good for this purpose; for example, if one side keeps a light-squared bishop and the opponent has a dark-squared one, the transformation into a bishops and pawns ending is usually advantageous for the weaker side only, because an endgame with bishops on opposite colors is likely to be a draw, even with an advantage of a pawn, or sometimes even with a two-pawn advantage.
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In chess, tactics in general concentrate on short-term actions – so short-term that they can be calculated in advance by a human player or a computer. The possible depth of calculation depends on the player's ability. In positions with many possibilities on both sides, a deep calculation is more difficult and may not be practical, while in positions with a limited number of variations, strong players can calculate long sequences of moves.
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Theoreticians describe many elementary tactical methods and typical maneuvers, for example: pins, forks, skewers, batteries, discovered attacks (especially discovered checks), zwischenzugs, deflections, decoys, sacrifices, underminings, overloadings, and interferences. Simple one-move or two-move tactical actions – threats, exchanges of , and double attacks – can be combined into more complicated sequences of tactical maneuvers that are often forced from the point of view of one or both players. A forced variation that involves a sacrifice and usually results in a tangible gain is called a . Brilliant combinations – such as those in the Immortal Game – are considered beautiful and are admired by chess lovers. A common type of chess exercise, aimed at developing players' skills, is a position where a decisive combination is available and the challenge is to find it.
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Chess strategy is concerned with the evaluation of chess positions and with setting up goals and long-term plans for future play. During the evaluation, players must take into account numerous factors such as the value of the pieces on the board, control of the center and centralization, the pawn structure, king safety, and the control of key squares or groups of squares (for example, diagonals, open files, and dark or light squares).
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The most basic step in evaluating a position is to count the total value of pieces of both sides. The point values used for this purpose are based on experience; usually, pawns are considered worth one point, knights and bishops about three points each, rooks about five points (the value difference between a rook and a bishop or knight being known as the exchange), and queens about nine points. The king is more valuable than all of the other pieces combined, since its checkmate loses the game. But in practical terms, in the endgame, the king as a fighting piece is generally more powerful than a bishop or knight but less powerful than a rook. These basic values are then modified by other factors like position of the piece (e.g. advanced pawns are usually more valuable than those on their initial squares), coordination between pieces (e.g. a pair of bishops usually coordinate better than a bishop and a knight), or the type of position (e.g. knights are generally better in with many pawns while bishops are more powerful in ).
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Another important factor in the evaluation of chess positions is (sometimes known as the ): the configuration of pawns on the chessboard. Since pawns are the least mobile of the pieces, pawn structure is relatively static and largely determines the strategic nature of the position. Weaknesses in pawn structure include isolated, doubled, or backward pawns and ; once created, they are often permanent. Care must therefore be taken to avoid these weaknesses unless they are compensated by another valuable asset (for example, by the possibility of developing an attack).
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The endgame (also or ) is the stage of the game when there are few pieces left on the board. There are three main strategic differences between earlier stages of the game and the endgame:
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Endgames can be classified according to the type of pieces remaining on the board. Basic checkmates are positions in which one side has only a king and the other side has one or two pieces and can checkmate the opposing king, with the pieces working together with their king. For example, king and pawn endgames involve only kings and pawns on one or both sides, and the task of the stronger side is to promote one of the pawns. Other more complicated endings are classified according to pieces on the board other than kings, such as "rook and pawn versus rook" endgames.
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The earliest texts referring to the origins of chess date from the beginning of the 7th century. Three are written in "Pahlavi" (Middle Persian) and one, the "Harshacharita", is in Sanskrit. One of these texts, the "Chatrang-namak", represents one of the earliest written accounts of chess. The narrator Bozorgmehr explains that "Chatrang", the Pahlavi word for chess, was introduced to Persia by 'Dewasarm, a great ruler of India' during the reign of Khosrow I.
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The oldest known chess manual was in Arabic and dates to about 840, written by al-Adli ar-Rumi (800–870), a renowned Arab chess player, titled "Kitab ash-shatranj" (The Book of Chess). This is a lost manuscript, but is referenced in later works. Here also, al-Adli attributes the origins of Persian chess to India, along with the eighth-century collection of fables Kalīla wa-Dimna. By the twentieth century, a substantial consensus developed regarding chess's origins in northwest India in the early 7th century. More recently, this consensus has been the subject of further scrutiny.
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The early forms of chess in India were known as (), literally "four divisions" [of the military] – infantry, cavalry, elephants, and chariotry – represented by pieces which would later evolve into the modern pawn, knight, bishop, and rook, respectively. Chaturanga was played on an 8×8 uncheckered board, called . Thence it spread eastward and westward along the Silk Road. The earliest evidence of chess is found in the nearby Sasanian Persia around 600 A.D., where the game came to be known by the name (). Chatrang was taken up by the Muslim world after the Islamic conquest of Persia (633–51), where it was then named (; ), with the pieces largely retaining their Persian names. In Spanish, "shatranj" was rendered as "ajedrez" ("al-shatranj"), in Portuguese as "xadrez", and in Greek as ζατρίκιον ("zatrikion", which comes directly from the Persian "chatrang"), but in the rest of Europe it was replaced by versions of the Persian "shāh" ("king"), from which the English words "check" and "chess" descend. The word "checkmate" is derived from the Persian "shāh māt" ("the king is dead").
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Xiangqi is the form of chess best-known in China. The eastern migration of chess, into China and Southeast Asia, has even less documentation than its migration west, making it largely conjectured. The word was used in China to refer to a game from 569 A.D. at the latest, but it has not been proven if this game was or was not directly related to chess.
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The first reference to Chinese chess appears in a book entitled "Xuán guaì lù" ("Record of the Mysterious and Strange"), dating to about 800. A minority view holds that western chess arose from xiàngqí or one of its predecessors, although this has been contested. Chess historians Jean-Louis Cazaux and Rick Knowlton contend that xiangqi's intrinsic characteristics make it easier to construct an evolutionary path from China to India/Persia than the opposite direction.
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The oldest archaeological chess artifacts – ivory pieces – were excavated in ancient Afrasiab, today's Samarkand, in Uzbekistan, Central Asia, and date to about 760, with some of them possibly being older. Remarkably, almost all findings of the oldest pieces come from along the Silk Road, from the former regions of the Tarim Basin (today's Xinjiang in China), Transoxiana, Sogdiana, Bactria, Gandhara, to Iran on one end and to India through Kashmir on the other.
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The game reached Western Europe and Russia via at least three routes, the earliest being in the 9th century. By the year 1000, it had spread throughout both the Muslim Iberia and Latin Europe. A Latin poem called "Versus de scachis" ("Verses on Chess") dated to the late 10th century, has been preserved at Einsiedeln Abbey in Switzerland.
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The game of chess was then played and known in all European countries. A famous 13th-century Spanish manuscript covering chess, backgammon, and dice is known as the "Libro de los juegos", which is the earliest European treatise on chess as well as being the oldest document on European tables games. The rules were fundamentally similar to those of the Arabic shatranj. The differences were mostly in the use of a checkered board instead of a plain monochrome board used by Arabs and the habit of allowing some or all pawns to make an initial double step. In some regions, the Queen, which had replaced the Vizier, and/or the King could also make an initial two-square leap under some conditions.
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Around 1200, the rules of shatranj started to be modified in Spain and the rest of Southern Europe, culminating, several major changes later, in the emergence of modern chess practically as it is known today. A major change was the modern piece movement rules, which began to appear in intellectual circles in Valencia, Spain, around 1475, which established the foundations and brought it very close to current Chess. These new rules then were quickly adopted in Italy and Southern France before diffusing into the rest of Europe. Pawns gained the ability to advance two squares on their first move, while bishops and queens acquired their modern movement powers. The queen replaced the earlier vizier chess piece toward the end of the 10th century and by the 15th century had become the most powerful piece; in light of that, modern chess was often referred to at the time as "Queen's Chess" or "Mad Queen Chess". Castling, derived from the "king's leap", usually in combination with a pawn or rook move to bring the king to safety, was introduced. These new rules quickly spread throughout Western Europe.
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Writings about chess theory began to appear in the 15th century. The "Repetición de Amores y Arte de Ajedrez" ("Repetition of Love and the Art of Playing Chess") by Spanish churchman Luis Ramírez de Lucena was published in Salamanca in 1497. Lucena and later masters like Portuguese Pedro Damiano, Italians Giovanni Leonardo Di Bona, Giulio Cesare Polerio and Gioachino Greco, and Spanish bishop Ruy López de Segura developed elements of opening theory and started to analyze simple endgames.
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In the 18th century, the center of European chess life moved from Southern Europe to mainland France. The two most important French masters were François-André Danican Philidor, a musician by profession, who discovered the importance of pawns for chess strategy, and later Louis-Charles Mahé de La Bourdonnais, who won a famous series of matches against Irish master Alexander McDonnell in 1834. Centers of chess activity in this period were coffee houses in major European cities like "Café de la Régence" in Paris and "Simpson's Divan" in London.
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At the same time, the intellectual movement of romanticism had had a far-reaching impact on chess, with aesthetics and tactical beauty being held in higher regard than objective soundness and strategic planning. As a result, virtually all games began with the Open Game, and it was considered unsportsmanlike to decline gambits that invited tactical play such as the King's Gambit and the Evans Gambit. This chess philosophy is known as Romantic chess, and a sharp, tactical style consistent with the principles of chess romanticism was predominant until the late 19th century.
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The rules concerning stalemate were finalized in the early 19th century. Also in the 19th century, the convention that White moves first was established (formerly either White or Black could move first). Finally, the rules around castling and en passant captures were standardized – variations in these rules persisted in Italy until the late 19th century. The resulting standard game is sometimes referred to as or , particularly in Asia where other games of the chess family such as xiangqi are prevalent. Since the 19th century, the only rule changes, such as the establishment of the correct procedure for claiming a draw by repetition, have been technical in nature.
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As the 19th century progressed, chess organization developed quickly. Many chess clubs, chess books, and chess journals appeared. There were correspondence matches between cities; for example, the London Chess Club played against the Edinburgh Chess Club in 1824. Chess problems became a regular part of 19th-century newspapers; Bernhard Horwitz, Josef Kling, and Samuel Loyd composed some of the most influential problems. In 1843, von der Lasa published his and Bilguer's "Handbuch des Schachspiels" ("Handbook of Chess"), the first comprehensive manual of chess theory.
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The first modern chess tournament was organized by Howard Staunton, a leading English chess player, and was held in London in 1851. It was won by the German Adolf Anderssen, who was hailed as the leading chess master. His brilliant, energetic attacking style was typical for the time. Sparkling games like Anderssen's Immortal Game and Evergreen Game or Morphy's "Opera Game" were regarded as the highest possible summit of the art of chess.
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Deeper insight into the nature of chess came with the American Paul Morphy, an extraordinary chess prodigy. Morphy won against all important competitors (except Staunton, who refused to play), including Anderssen, during his short chess career between 1857 and 1863. Morphy's success stemmed from a combination of brilliant attacks and sound strategy; he intuitively knew how to prepare attacks.
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Prague-born Wilhelm Steinitz laid the foundations for a scientific approach to the game, the art of breaking a position down into components and preparing correct plans. In addition to his theoretical achievements, Steinitz founded an important tradition: his triumph over the leading German master Johannes Zukertort in 1886 is regarded as the first official World Chess Championship. This win marked a stylistic transition at the highest levels of chess from an attacking, tactical style predominant in the Romantic era to a more positional, strategic style introduced to the chess world by Steinitz. Steinitz lost his crown in 1894 to a much younger player, the German mathematician Emanuel Lasker, who maintained this title for 27 years, the longest tenure of any world champion.
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After the end of the 19th century, the number of master tournaments and matches held annually quickly grew. The first Olympiad was held in Paris in 1924, and FIDE was founded initially for the purpose of organizing that event. In 1927, the Women's World Chess Championship was established; the first to hold the title was Czech-English master Vera Menchik.
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A prodigy from Cuba, José Raúl Capablanca, known for his skill in endgames, won the World Championship from Lasker in 1921. Capablanca was undefeated in tournament play for eight years, from 1916 to 1924. His successor (1927) was the Russian-French Alexander Alekhine, a strong attacking player who died as the world champion in 1946. Alekhine briefly lost the title to Dutch player Max Euwe in 1935 and regained it two years later.
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In the interwar period, chess was revolutionized by the new theoretical school of so-called hypermodernists like Aron Nimzowitsch and Richard Réti. They advocated controlling the of the board with distant pieces rather than with pawns, thus inviting opponents to occupy the center with pawns, which become objects of attack.
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After the death of Alekhine, a new World Champion was sought. FIDE, which has controlled the title since then, ran a tournament of elite players. The winner of the 1948 tournament was Russian Mikhail Botvinnik.
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