README.md

metadata

license: cc0-1.0
dataset_info:
  features:
    - name: image
      dtype: image
    - name: board_state
      dtype: string
    - name: active_color
      dtype: string
    - name: castling_rights
      dtype: string
    - name: en_passant_target_square
      dtype: string
    - name: best_continuation
      dtype: string
  splits:
    - name: train
      num_bytes: 26061473408.474
      num_examples: 999999
    - name: validation
      num_bytes: 3293166231
      num_examples: 125000
    - name: test
      num_bytes: 3242260311
      num_examples: 125000
  download_size: 31940403915
  dataset_size: 32596899950.474
configs:
  - config_name: default
    data_files:
      - split: train
        path: data/train-*
      - split: validation
        path: data/validation-*
      - split: test
        path: data/test-*
language:
  - en
tags:
  - chess
  - chess puzzles
  - lichess
  - chess positions
  - chess board

Dataset Card for Chess Puzzles Images (large)

This dataset contains 1,249,999 chess board positions in JPG format, derived from Lichess puzzles. Each image is accompanied by a shortened FEN string, indication for the color to play as, castling and en passant availability, and best moves in standard algebraic notation. The fields are as follows:

• image: image, A visual representation of the chess board showing the current piece arrangement.
• board_state: string, A shortened FEN (Forsyth–Edwards Notation) string representing the piece placement on the board after the opponent's move. This state indicates the position from which the player must find the correct continuation.
• active_color: string, Indicates which player's turn it is to move. "w" for White to move and "b" for Black to move.
• castling_rights: string, Indicates the remaining castling options for both players. If neither side has the ability to castle, this field uses the character "-". Otherwise, this field contains one or more letters: "K" if White can castle kingside, "Q" if White can castle queenside, "k" if Black can castle kingside, and "q" if Black can castle queenside.
• en_passant_target_square: string, Specifies the square in algebraic notation where an en passant capture is possible. If no en passant capture is available, this field contains "-".
• best_continuation: string, The solution to the puzzle, consisting of "only moves" - moves that are significantly better than any alternatives. For mate-in-one puzzles, multiple solutions may exist if they all result in checkmate.