Fairy-Stockfish 11.1

This release adds support for Janggi (장기, Korean chess), along with several improvements and bugfixes.

New

• Variants
  • Janggi (Korean Chess)
  • Makpong
  • Three Kings
  • Koedem
• Variant configuration options
  • Mobility area per piece type
  • Janggi related rules (passing, palace moves, bikjang)
  • piece drop restrictions
  • piece count for extinction variants
• Variant configuration checker
  • automatically identifies errors in variant configuration files

Improvements

• Significant improvement of Winboard/XBoard compatibility by highlighting legal moves
• Playing strength improvements, especially for extinction, nCheck, and capture the flag variants
• More partner communication in bughouse
• Extended range of available skill levels

Fixes

• Prohibit Sittuyin promotions that attack pieces
• Disable Makruk counting in presence of unpromoted pawns
• Start ASEAN counting at one
• Correct SFEN parsing for pieces in hand
• Use seconds as time unit for st command
• Clear search state on new in CECP protocol
• Prevent race condition in communication of holdings in bughouse

Thanks to all CPU contributors, and to @Fulmene for code contributions.

Files of the release

• .exe are Windows executables, the files without extensions are Linux binaries.
• Versions containing largeboard have support for board sizes >8x8, the others are faster but have less variants.
• Use bmi2 versions for best performance on modern hardware, or fairy-stockfish-largeboard_x86-64.exe for best compatibility.