thomas-schweich/lichess-1800-1900

---
license: cc0-1.0
task_categories:
- other
tags:
- chess
- lichess
size_categories:
- 10M<n<100M
configs:
- config_name: default
data_files:
- split: train
path: data/*.parquet
---

# Lichess 1800-1900 Elo Games

Filtered subset of the [Lichess open database](https://database.lichess.org/) where
**both** players are rated 1800-1900.

## Usage

```python
from datasets import load_dataset

ds = load_dataset("thomas-schweich/lichess-1800-1900")
game = ds["train"][0]
print(game["pgn"]) # move text
print(game["white_elo"]) # 1847
print(game["headers"]) # full PGN headers (for parser compatibility)
```

## Schema

| Column | Type | Description |
|--------|------|-------------|
| `pgn` | string | Move text (SAN) |
| `headers` | string | Full PGN header block |
| `white_elo` | int16 | White player Elo |
| `black_elo` | int16 | Black player Elo |
| `result` | string | Game result (1-0, 0-1, 1/2-1/2) |
| `time_control` | string | Time control (e.g. 600+0) |
| `opening` | string | Opening name |
| `date` | string | Game date (YYYY.MM.DD) |
| `month` | string | Source month (YYYY-MM) |

## Stats

- **Total games:** 11,246,063
- **Elo range:** 1800-1900 (both players)
- **Source months:** 2025-01, 2025-02

## License

[CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/), consistent with the
[Lichess database license](https://database.lichess.org/).

## Attribution

Data sourced from the [Lichess open database](https://database.lichess.org/).
Lichess is a free, open-source chess server: [lichess.org](https://lichess.org).