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SPECS.MD

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Board representation

  • 0x88 board representation
  • 32-bit Zobrizt hashing
  • piece lists

Move generator

  • on the fly attacks
  • incremental updates of position on make move/take back
  • move stack for storing board state variables

Evaluation

  • based on simplified evaluation by Tomasz Michniewski
  • material + PST only obtained by Texel's tuning method
  • tapared evaluation
  • insufficient material detection

Search

  • 50 move rule detection
  • 3 fold repetition detection
  • stand pat quiescence
  • on the fly move sorting
  • MVV_LVA/killer/history/PV move ordering
  • Evaluation pruning
  • NMP (Null move pruning)
  • Razoring
  • Futility pruning
  • LMR (Late move reduction)
  • PVS (Principal variation search)

Interfaces

  • UCI protocol
  • Web browser