A synthetic dataset of 25,003,202 individual chess moves across 92,733 fully legal games, generated move-by-move with real chess-rules validation (every move is legal, every game is genuinely playable from start to finish, and every move is recorded in standard algebraic notation).
Important note on play quality: these games are fully legal but NOT master-level play — each move is chosen uniformly at random from the set of legal moves available… See the full description on the dataset page:
https://huggingface.co/datasets/ziadatalabs/FreeChessGames25M.
