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Update README.md
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README.md
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pretty_name: Lichess puzzles
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tags:
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- chess
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pretty_name: Lichess puzzles
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tags:
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- chess
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---
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# Dataset Card for Lichess Puzzles
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<!-- Provide a quick summary of the dataset. -->
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4,062,423 chess puzzles, rated and tagged. See them in action on [Lichess](https://lichess.org/training/themes).
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## Dataset Details
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```python
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Dataset({
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features: ['PuzzleId', 'FEN', 'Moves', 'Rating', 'RatingDeviation', 'Popularity', 'NbPlays', 'Themes', 'GameUrl', 'OpeningTags'],
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num_rows: 4062423
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})
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```
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```json
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{'PuzzleId': '00008',
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'FEN': 'r6k/pp2r2p/4Rp1Q/3p4/8/1N1P2R1/PqP2bPP/7K b - - 0 24',
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'Moves': 'f2g3 e6e7 b2b1 b3c1 b1c1 h6c1',
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'Rating': 1931,
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'RatingDeviation': 76,
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'Popularity': 94,
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'NbPlays': 6319,
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'Themes': 'crushing hangingPiece long middlegame',
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'GameUrl': 'https://lichess.org/787zsVup/black#47',
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'OpeningTags': None}
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```
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### Dataset Creation
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Generating these chess puzzles took more than 50 years of CPU time. We went through 300,000,000 analyzed games from the Lichess database, and re-analyzed interesting positions with Stockfish 12/13/14/15 NNUE at 40 meganodes. The resulting puzzles were then [automatically tagged](https://github.com/ornicar/lichess-puzzler/tree/master/tagger). To determine the rating, each attempt to solve is considered as a Glicko2 rated game between the player and the puzzle. Finally, player votes refine the tags and define popularity.
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## Dataset Structure
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<!-- This section provides a description of the dataset fields, and additional information about the dataset structure such as criteria used to create the splits, relationships between data points, etc. -->
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### Dataset
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