Maybe you can create your own:
https://rebel13.nl/download/books.html
Polyglot opening books
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Jun 26, 2021
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#2
Jun 28, 2021
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#3
Somebody else provided these links:
I found two sources for Polyglot opening books:
- Richard Pijl has released his opening book alongside The Baron 3.43, which he says is almost identical to the version that played in the 2018 WCCC. Read more about these here.
- Sourceforge claims to have a polyglot book collection for download here. The main page is here.
EDIT: Found two more here.
The openings book "Human.bin".
This "polyglot book" is a part of Deep Saros and play very aggressive and fun line of openings, like: Grob Attack, Blackmar-Dietmer Gambit, Englund Gambit, Greco Gambit, Albin Counter Gambit, Goering Gambit, Borg Defence, Polish Defence, Damiano Defence, From Gambit, Amar/Paris Opening, Fred Defence, Barnes Opening, etc...
and
The openings book "Titans.bin".
This "polyglot book" was prepared by Flavio Martin, an Italian chess player and has been very strong. Is an excellent tool for analysis, preparation and training, and a viable alternative to other openings books. It's certainly being testing!
I'm looking for open-source polyglot opening books to help exclude opening moves from a tool I'm developing which analyzes games from PGN.