Dataset · Hugging Face

burmich/ChessFENS

Name: ChessFENS
Creator: burmich
Keywords: size_categories:100M<n<1B, format:parquet, modality:text, modality:timeseries, library:datasets, library:dask, library:polars, library:mlcroissant, region:us

📘 Chess FEN Dataset with WDL & Policy Vectors This dataset contains 732 million rows of chess positions stored in Parquet format. Each row includes the following fields: fen: A standard FEN string representing the current board position. wdl: A 3-element vector [win_prob, draw_prob, lose_prob] representing the win/draw/loss probabilities for the side to move. policy: A vector of 1858 elements representing the probability distribution over legal moves for the current position, based… See the full description on the dataset page: https://huggingface.co/datasets/burmich/ChessFENS.

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Author / organization	burmich
Downloads	169 (as reported by Hugging Face)
Likes	0
Created	17 March 2026
Last updated at source	17 March 2026

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