Update README.md

README.md

@@ -21,7 +21,7 @@ dataset_info:
     num_bytes: 477938253.5
     num_examples: 12500
   - name: test
-    num_bytes: 479103793.0
+    num_bytes: 479103793
     num_examples: 12500
   download_size: 4435938030
   dataset_size: 4776986468.652
@@ -34,4 +34,23 @@ configs:
     path: data/validation-*
   - split: test
     path: data/test-*
+license: cc0-1.0
+language:
+- en
+tags:
+- chess
+- chess puzzles
+- lichess
+- chess positions
+- chess board
 ---
+# Dataset Card for Chess Puzzles Images (mini)
+This dataset contains 124,999 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.