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Better algorithms and Evaluation function

 

11 Oct 2022

long time no see

3 am

  • well, there's a lot of small and big changes. i'll try to explain by checking the diff.
  • AI part:
    • replaced minimax with alpha-beta (similar to negamax version)
    • TODO: implement quiescence search
    • added piece-square table scoring in eval function
    • reduced branching in code
  • move generation part:
    • bugfix: moves like e1c1 were always interpreted as castling, fixed
    • changed board representation from string to char[64]
    • now king positions are incrementally saved, so faster to find kings
    • several optimizations in move generation
  • general:
    • now engine trys to avoid moves leading to repetitions (but it is not always optimal, so should do something better)
    • fixed several gui bugs in promotion and flipping
    • gui supports (some) premoves
    • fixed some bugs in move hints, still some remaining ig
    • faster makefile
  • BIGGEST UPDATES:
    • uci protocol working!
    • made a lichess bot running this engine!

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