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@konsolas konsolas released this 09 Jun 21:09
· 49 commits to master since this release
v0.7.0
9579fc2
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Learn about vigilant mode.

General

  • Optimised threefold repetition checking
  • Error messages are now printed to STDERR for easier logging
  • Significantly reduced memory overhead in general
  • Each thread now gets a thread local pawn hash (1MiB/thread)
  • The Move From Hash feature can no longer return empty moves (this was likely the cause of illegal moves in 5-piece Syzygy positions)
  • The Move From Hash feature will no longer be used if the hash move leads to threefold repetition
  • Updated GCC to 9.1.0 (MSYS2)
  • Added a znver2 compile for the upcoming Ryzen 3000 series.

Search

  • Quiescence root nodes are no longer counted twice

Evaluation

  • Moved pawn structure evaluation to a separate file
  • Retuned all parameters
  • Added a parameter for candidate passed pawns
  • Pawn structure evaluation is now performed setwise with bitboards
  • Entries in the pawn hash table have been reduced in size
  • King safety evaluation function now allows for attacks up to size 128

This should finally fix the illegal move issue.

Elo gains over 0.6.1 are reasonable, measured to be around +30 against a small gauntlet of 9 engines.

Assets 14
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