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---
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](https://lichess.org/training/themes) 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. |