Combusken – UCI-compliant chess engine

Combusken is a UCI-compliant open source chess engine using Alpha-beta algorithm.

The software saw its first release in 2020.

Combusken is free and open source software.

Features include:

  • Bitboards
  • Plain Magic Bitboards
  • Search:
    • Lazy SMP.
    • Iterative Deepening.
    • Aspiration Windows.
    • Alpha-Beta.
    • Transposition Table.
    • Selectivity:
      • Check Extensions.
      • Castling Extension.
      • Singular Extensions.
      • Late Move Reductions.
      • Null Move Pruning.
      • Futility Pruning.
      • Reverse Futility Pruning.
      • Late Move Pruning.
      • Static Exchange Evaluation Pruning.
    • Move Ordering:
      • Hash Move.
      • Internal Iterative Deepening.
      • MVV/LVA.
      • Static Exchange Evaluation.
      • Killer Heuristic.
      • History Heuristic.
      • Countermove Heuristic.
      • Follow Up History.
  •  Evaluation:
    • Tapered Eval.
    • Material.
    • Bishop Pair.
    • Piece-Square Tables.
    • Mobility.
    • Outposts.
    • Rook on (Half) Open File.
    • Pawn-King Hash Table.
    • Pawn Structure:
      • Passed Pawn.
      • Isolated Pawn.
      • Doubled Pawn.
      • Backward Pawn.
      • Straggler.
      • Connected Pawns.
    • King Safety:
      • Pawn Shield.
      • Pawn Storm.
      • Attacking King Zone.
    • Hanging Pieces.
    • Tempo.
    • Automated Tuning using Gradient Descent.

Developer: Marcin Henryk Bartkowiak
License: GNU General Public License v3.0

Combusken is written in Go and C. Learn Go with our recommended free books and free tutorials.

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