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README.md
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---
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license: cc0-1.0
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tags:
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- lichess
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- chess
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- puzzles
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- datasets
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---
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# Lichess Puzzle Database …
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# Lichess Puzzle Database ▸ Mate‑in‑1/2/3 Subset
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A 10k slice of the official Lichess puzzle corpus.
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**Note: The board is updated to the position that arises after the opponent blunders.**
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## Source
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* Original dataset: [https://huggingface.co/datasets/Lichess/chess-puzzles](https://huggingface.co/datasets/Lichess/chess-puzzles)
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## What’s Inside
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| Category | Count |
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| --------- | -------- |
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| Mate‑in‑1 | 3333 |
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| Mate‑in‑2 | 3333 |
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| Mate‑in‑3 | 3333 |
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| **Total** | **9999** |
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## Format Improvements
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| Field | Old | New |
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| -------- | -------- | ------------------------------- |
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| Position | FEN | **FEN** & **PGN** |
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| Solution | UCI move | **UCI move** & **SAN move** |
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## License
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Data and code released under **CC0‑1.0** — no rights reserved.
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