New Version of The Baron (v3.43) plus The Baron’s Polyglot Opening Book

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Richard Pijl has been kind enough to released The Baron 3.43. This is almost identical to the version that played in the 2018 WCCC. Here are Richard’s release notes:

Changes since 3.42:

Bugs solved:

  • Pin detection in evaluation only detected close pins.
  • Handle spaces in the syzygy path
  • Slightly more restrictive in playing easy moves
  • Fixed singular extensions bug
  • Increased search stack size

Improvement:

  • Detecting pins to the queen
  • Evaluation tuning
  • Better use of time, especially on short time controls
  • More selective in quiescence
  • Reduced aspiration window

Changes since 3.41:

Bugs solved:

  • UCI mode possible from the command prompt
  • Handling missing dtz files correctly (I hope)
  • Show Refutations is disabled as I did not have the time yet to look at it.

Improvement:

  • Changed scoring on TB hits
  • Keep probing TB during search on reaching TB positions
  • Added Syzygy path option to UCI
  • Ported to Raspberry Pi
  • Full functionality available in native Linux version
  • Refactoring of several classes

You can download it here. There is also The Baron’s opening book (in Polyglot format).