Stockfish+

STOCKFISH+

February, 25 2026

WHAT IS STOCKFISH+?

Stockfish+ is basically the same Stockfish chess engine, with the ability to read Polyglot (.bin) book and Chessbase (.ctg) books. Its first version is paired with Stockfish 18 and can read up to two different books at the same time, of your choice, whether bin or ctg.

This chess engine is the successor of Stockfish Polyglot. The feature of reading both the kind of books was requested many times over the years.

AD: GOI 7 opening book for chess computers on sale.

DOWNLOAD:

Windows

Stockfish+ 1 64-bit

Stockfish+ 1 64-bit AVX2

Stockfish+ 1 64-bit ppc

Stockfish+ 1 64-bit SSE3-ppc

Stockfish+ 1 64-bit SSE41-ppc

Stockfish+ 1 64-bit SSSE3

Stockfish+ 1 64-bit BMI2

Stockfish+ 1 64-bit general

Stockfish+ 1 32-bit

Stockfish+ 1 32-bit ppc

Stockfish+ 1 32-bit sse2

Stockfish+ 1 32-bit sse41-ppc

Stockfish+ 1 32-bit general

Android

Stockfish+ 1 installable apk archive for both 64-bit and 32-bit

Linux

SPECIFICS:

- the checkboxes '(CTG) Book x Only Green' are unchecked by default, since not all the ctg books have the priorities (green moves) marked

- the limitation of a maximum 1024 threads has been removed since Stockfish 17

- all the chess programs in these packages have been built with the latest compiler versions available at the time of the release

- due to the increased size of the NNUE networks that Stockfish uses to gain strength, these chess programs have grown to up to 100 MBs per binary (network embedded)

- Stockfish+ can read bin or ctg opening databases at a depth of your choice, up to 255 plies. If at a given position in the book different moves have the same score, Stockfish+ will randomly choose one, with a maximum range of three candidate equal moves.

Examples of multi-book using:

Book 1 Path+File:
C:\Books\Goi 7.ctg

Book 2 Path+File
C:\Books\Cerebellum3Merge.bin

The path under Android is different. Example (Droidfish):

Book 1 Path+File:
/storage/emulated/0/DroidFish/book/Goi 7.ctg

Book 2 Path+File
/storage/emulated/0/DroidFish/book/Cerebellum3Merge.bin

NOTES:

The source code - as well as the list of all Stockfish developers - is included inside the packages you download here, in compliance with the GPL license.

THANKS:

I thank Khalid Omar for his ctg implementation, Marco Zerbinati for supporting me by correcting errors I made when modifying the source and for providing me the base to work with (thread here). I also thank ChatGPT, for helping with the compilation under the Linux environment, Gemini, for providing solid support in correcting and updating the base project to create an apk installer from the Stockfish source code and Archimedes of the OutSkirts Forum, for implementing such project and explained to me how it worked (thread here, project here).