README.md

metadata

tags:
  - trl
license: cc0-1.0

Chess Puzzles Dataset

Summary

The Chess Puzzles dataset is a processed version of the Lichess puzzle database: 6 million positions from real games, each with a single winning move, rated by how hard Lichess players found them. Each puzzle is a prompt showing the board, its FEN and the legal moves, and a completion with the first move of the solution in UCI notation.

Data Structure

• Format: Conversational
• Type: Prompt-completion

Columns:

• "prompt": The puzzle: the side to move, the board, its FEN and the legal moves.
• "completion": The first move of the solution, in UCI notation (for example e2e4).
• "PuzzleId", "Rating", "Themes": The Lichess puzzle ID, its rating, and its themes (mateIn2, fork, ...).

The test split holds 1,000 puzzles. Lichess also accepts any move that mates, so a model that answers with another mating move solves the puzzle too.

Generation script

The script used to generate this dataset can be found here.