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Release V1.43

V1.43 was released on 2021-Aug-29. You can download the release ZIP file (4 MB):

Changes from V1.42

  • Added late move pruning near the main search leaves.
  • Simplified quiescence search.
  • Quiescence delta pruning cuts off remaining moves if the current one has no hope of improving alpha.
  • The “en passant” square is cleared before a null move search and restored afterwards.
  • Null move search is skipped if the null depth is zero and the static node evaluation below beta.
  • Always reward the right to move, not only in the opening.
  • Added hash and PV move priorisation in early move generation.
  • Improved bishop corner capture with enemy pawn.
  • Enabled multi-page PV display in “pretty print” format.
  • Changed the dialogue display order from OK/CL to CL/OK.
  • Fixed a bug where undoing moves and then entering a new position would not clear the move list in the main screen.
  • Fixed winning KBN:K.

UCI versions

  • More strength throtteling at the low end around 1000 Elo.


  • The Android build chain has been updated from NDK r21e to r23.

Known issues

All versions

  • Capturing a castling enabled rook and then recapturing with another rook keeps the castling rights.

Embedded target

  • The firmware is not compatible with the Olimex H405 mainboard variant that has a GigaDevice GD32F405 controller instead of an STMicroelectronics STM32F405.

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.