Free Chess Opening Books

Click each book to begin downloading right away

BIN (Polyglot)

Cerebellum_Light_3Merge_200916.7z (source)
gm2001.bin (source)
komodo.bin (source)
rodent.bin (source)
Titans.bin (source)
Human.bin (source)

CTG (Chessbase)

HiarcsBookRef2550Lite-ctg.zip (source)

Multi (Archives containing multiple formats)

Perfect 2021.7z (source) (ABK, CTG, BIN, BKT)