---
license: cc0-1.0
tags:
  - lichess
  - chess
  - puzzles
  - datasets
---

# Lichess Puzzle Database …

# Lichess Puzzle Database ▸ Mate‑in‑1/2/3 Subset

A 10k slice of the official Lichess puzzle corpus.

**Note: The board is updated to the position that arises after the opponent blunders.**

## Source

* Original dataset: [https://huggingface.co/datasets/Lichess/chess-puzzles](https://huggingface.co/datasets/Lichess/chess-puzzles)

## What’s Inside

| Category  |  Count   |
| --------- | -------- |
| Mate‑in‑1 |  3333     |
| Mate‑in‑2 |  3333    |
| Mate‑in‑3 |  3333   |
| **Total** |  **9999** |

## Format Improvements

| Field    | Old      | New                             |
| -------- | -------- | ------------------------------- |
| Position | FEN      | **FEN** & **PGN**   |
| Solution | UCI move | **UCI move** & **SAN move** |

## License

Data and code released under **CC0‑1.0** — no rights reserved.