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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Moonfish Chess</title>
<link rel="stylesheet" href="https://unpkg.com/@chrisoakman/chessboardjs@1.0.0/dist/chessboard-1.0.0.min.css">
<style>
* { box-sizing: border-box; }
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
color: #fff;
min-height: 100vh;
margin: 0;
padding: 20px;
}
.container {
max-width: 800px;
margin: 0 auto;
}
h1 {
text-align: center;
margin-bottom: 10px;
}
.subtitle {
text-align: center;
color: #888;
margin-bottom: 30px;
}
.subtitle a { color: #4da6ff; }
#board-container {
width: 100%;
max-width: 500px;
margin: 0 auto 20px;
}
#board { width: 100%; }
.info-panel {
background: rgba(255,255,255,0.1);
border-radius: 8px;
padding: 15px;
margin-bottom: 15px;
}
.status { font-size: 1.2em; margin-bottom: 10px; }
.controls { display: flex; gap: 10px; flex-wrap: wrap; }
button {
background: #4da6ff;
color: #fff;
border: none;
padding: 10px 20px;
border-radius: 5px;
cursor: pointer;
font-size: 1em;
}
button:hover { background: #3d8bd9; }
button:disabled { background: #555; cursor: not-allowed; }
.move-history {
background: rgba(0,0,0,0.3);
border-radius: 5px;
padding: 10px;
max-height: 150px;
overflow-y: auto;
font-family: monospace;
}
.thinking { color: #ffd700; }
.error { color: #ff6b6b; }
.win { color: #4ade80; }
.loss { color: #f87171; }
.draw { color: #fbbf24; }
select {
background: #2a2a4a;
color: #fff;
border: 1px solid #555;
padding: 8px;
border-radius: 5px;
font-size: 1em;
}
</style>
</head>
<body>
<div class="container">
<h1>♟️ Moonfish Chess</h1>
<p class="subtitle">Play against the <a href="https://github.com/luccabb/moonfish" target="_blank" rel="noopener">Moonfish</a> chess engine</p>
<div id="board-container">
<div id="board"></div>
</div>
<div class="info-panel">
<div class="status" id="status">Loading...</div>
<div class="controls">
<button id="newGame">New Game</button>
<select id="playerColor">
<option value="white">Play as White</option>
<option value="black">Play as Black</option>
</select>
<select id="difficulty">
<option value="1">Easy</option>
<option value="2" selected>Medium</option>
<option value="3">Hard</option>
</select>
</div>
</div>
<div class="info-panel">
<strong>Move History:</strong>
<div class="move-history" id="moveHistory">-</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script src="https://unpkg.com/@chrisoakman/chessboardjs@1.0.0/dist/chessboard-1.0.0.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chess.js/0.10.3/chess.min.js"></script>
<script>
const API_BASE = window.location.origin;
let board = null;
let game = new Chess();
let playerColor = 'white';
let isThinking = false;
function updateStatus(msg, className = '') {
const el = document.getElementById('status');
el.textContent = msg;
el.className = 'status ' + className;
}
function updateMoveHistory() {
const moves = game.history();
let html = '';
for (let i = 0; i < moves.length; i += 2) {
const moveNum = Math.floor(i / 2) + 1;
html += moveNum + '. ' + moves[i];
if (moves[i + 1]) html += ' ' + moves[i + 1];
html += ' ';
}
document.getElementById('moveHistory').textContent = html || '-';
}
function onDragStart(source, piece) {
if (game.game_over()) return false;
if (isThinking) return false;
if ((playerColor === 'white' && piece.search(/^b/) !== -1) ||
(playerColor === 'black' && piece.search(/^w/) !== -1)) {
return false;
}
if ((game.turn() === 'w' && playerColor !== 'white') ||
(game.turn() === 'b' && playerColor !== 'black')) {
return false;
}
return true;
}
async function makeEngineMove() {
if (game.game_over()) return;
isThinking = true;
updateStatus('Moonfish is thinking...', 'thinking');
try {
// Get legal moves for engine
const moves = game.moves({ verbose: true });
if (moves.length === 0) return;
// Call our API to get the best move
const fen = game.fen();
const response = await fetch(API_BASE + '/engine-move', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
fen: fen,
depth: parseInt(document.getElementById('difficulty').value)
})
});
if (!response.ok) throw new Error('Engine error');
const data = await response.json();
const move = game.move({
from: data.move.substring(0, 2),
to: data.move.substring(2, 4),
promotion: data.move.length > 4 ? data.move[4] : undefined
});
if (move) {
board.position(game.fen());
updateMoveHistory();
}
} catch (err) {
console.error('Engine error:', err);
// Fallback: make a random legal move
const moves = game.moves({ verbose: true });
if (moves.length > 0) {
const randomMove = moves[Math.floor(Math.random() * moves.length)];
game.move(randomMove);
board.position(game.fen());
updateMoveHistory();
}
}
isThinking = false;
checkGameOver();
}
function checkGameOver() {
if (game.in_checkmate()) {
const winner = game.turn() === 'w' ? 'Black' : 'White';
const isPlayerWin = (winner.toLowerCase() === playerColor);
updateStatus(winner + ' wins by checkmate!', isPlayerWin ? 'win' : 'loss');
} else if (game.in_stalemate()) {
updateStatus('Draw by stalemate', 'draw');
} else if (game.in_threefold_repetition()) {
updateStatus('Draw by repetition', 'draw');
} else if (game.insufficient_material()) {
updateStatus('Draw - insufficient material', 'draw');
} else if (game.in_draw()) {
updateStatus('Draw', 'draw');
} else if (game.in_check()) {
updateStatus(game.turn() === 'w' ? 'White is in check' : 'Black is in check');
} else {
updateStatus(game.turn() === 'w' ? 'White to move' : 'Black to move');
}
}
function onDrop(source, target) {
const move = game.move({
from: source,
to: target,
promotion: 'q'
});
if (move === null) return 'snapback';
updateMoveHistory();
checkGameOver();
if (!game.game_over()) {
setTimeout(makeEngineMove, 250);
}
}
function onSnapEnd() {
board.position(game.fen());
}
async function newGame() {
playerColor = document.getElementById('playerColor').value;
game.reset();
board.start();
board.orientation(playerColor);
updateMoveHistory();
updateStatus(playerColor === 'white' ? 'Your turn (White)' : 'Moonfish is thinking...',
playerColor === 'black' ? 'thinking' : '');
if (playerColor === 'black') {
setTimeout(makeEngineMove, 500);
}
}
// Initialize
const config = {
draggable: true,
position: 'start',
onDragStart: onDragStart,
onDrop: onDrop,
onSnapEnd: onSnapEnd,
pieceTheme: 'https://chessboardjs.com/img/chesspieces/wikipedia/{piece}.png'
};
board = Chessboard('board', config);
$(window).resize(() => board.resize());
document.getElementById('newGame').addEventListener('click', newGame);
document.getElementById('playerColor').addEventListener('change', newGame);
updateStatus('White to move - drag a piece to play!');
</script>
</body>
</html>
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