Chessmont Open Database

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Chessmont Open Database

Access millions of chess games from Chess.com, Lichess, TWIC and PGN Mentor. Files compressed in .zst format (use zstd to decompress).

Explore Data 🔧 GitHub 📊 Kaggle
📊
16
files available
🌐
4
Sources
♟️
PGN/TSV
Format
📦
ZST
Compressed

Available Datasets

Explore our collection of chess data from various sources, carefully processed and optimized for analysis. High-level games (2400+ ELO) and long formats (3 minutes minimum).

🏆 Final Dataset

The ultimate chess dataset

Chessmont 3 files

chessmont.pgn.zst
21.5+ million unique games (no duplicates) - Merged Lichess 2500+ ELO history, Chess.com Top 10K blitz 2500+, TWIC, PGN Mentor
21.5M Games
chessmont-pgi.tsv.zst
1.8+ billion indexed positions linked to original game IDs
1.8B Index
fens-all.tsv.zst
1.35+ billion unique FEN positions with occurrence statistics
1.35B Positions

Chess.com Games 3 files

chesscom-2400.pgn.zst
Chess.com games 2400+ ELO
2400+ ELO
chesscom-2400-180.zst
Chess.com games 2400+ ELO (3 minutes minimum)
2400+ ELO, 3min+
chesscom-2500-180.pgn.zst
Chess.com games 2500+ ELO (3 minutes minimum)
2500+ ELO, 3min+

Lichess Games 4 files

lichess-2400.pgn.zst
Lichess games 2400+ ELO
2400+ ELO
lichess-2400-eval.pgn.zst
Lichess games 2400+ ELO with evaluations
2400+ ELO, Analyzed
lichess-2400-180.pgn.zst
Lichess games 2400+ ELO (3 minutes minimum)
2400+ ELO, 3min+
lichess-2500-180.pgn.zst
Lichess games 2500+ ELO (3 minutes minimum)
2500+ ELO, 3min+

Chess Positions (FEN) 2 files

fens-onlyrecurrent.tsv.zst
Recurrent FEN positions
Filtered
fens-withoutone.tsv.zst
FEN positions without singles
Filtered

External Sources 3 files

pgnmentor.pgn.zst
PGN Mentor games
Archive
twic.pgn.zst
The Week in Chess
Weekly
twic-pgnmentor.pgn.zst
Combined TWIC + PGN Mentor
Combined

Opening Theory 1 file

openings.tsv
Opening database
Reference