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---
license: cc0-1.0
configs:
- config_name: default
data_files:
- split: train
path: data/**/train-*
---
> [!CAUTION]
> This dataset is still a work in progress and some breaking changes might occur.
## Note
The `FEN` column has 961 unique values instead of the expected 960, because some rematches were [recorded with invalid castling rights in their starting FEN](https://github.com/lichess-org/database/issues/54) in November 2023.
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