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Release V1.40

V1.40 was released on 05-Apr-2020 and is the current stable version. You can download the release ZIP file (5 MB):

Changes from V1.34

  • More aggressive pruning in search.
  • Increased value of rook vs. minor and pawns if both sides have pawns.
  • Improved handling of king and queen vs. king and rook.
  • Simplified code for king, knight and bishop vs. king.
  • Compressed the bitbase for king and pawn vs. king from 32 kB to 24 kB.
  • The mate searching mode is about 30% faster, and opponent mate search has been removed.
  • More opening book knowledge.
  • Improved protection against false opening book hits.
  • Added option for aggregate castling rights in the position editor.


  • The Android build chain has been updated from NDK r18b to r21.

Raspberry Pi

  • The GCC build chain has been updated from 4.6.3 (Wheezy) to 8.3.0 (Buster).

Known issues

There are no known issues in V1.40.

Note: issues are fixed with new releases only – there are no backports. However, if an issue is found, it will be listed for the previous releases where applicable.