Chess Engines

Laser – UCI-compliant chess engine

Laser is a UCI-compliant chess engine.

This is a command-line engine only. To have a graphical interface, the executable can be used with any UCI chess GUI such as XBoard.

Laser is released under an open source license.

Features include:

  • Lazy SMP up to 128 threads.
  • Fancy magic bitboards for a 4.5 sec PERFT 6 @2.2 GHz (no bulk counting).
  • Evaluation:
    • Tuned with reinforcement learning, coordinate descent, and a variation of Texel’s Tuning Method.
    • Piece square tables.
    • King safety, pawns shields and storms.
    • Isolated/doubled/passed/backwards pawns.
    • Mobility.
    • Outposts.
    • Basic threat detection and pressure on weak pieces.
  • A two-bucket transposition table with Zobrist hashing, 16 MB default size.
  • An evaluation cache.
  • Syzygy tablebase support.
  • Fail-soft principal variation search:
    • Adaptive null move pruning, late move reduction.
    • Futility pruning, razoring, move count based pruning (late move pruning).
    • Check and singular extensions.
  • Quiescence search with captures, queen promotions, and checks on the first two plies.
  • Move ordering:
    • Internal iterative deepening when a hash move is not available.
    • Static exchange evaluation (SEE) and Most Valuable Victim / Least Valuable Attacker (MVV/LVA) to order captures.
    • Killer and history heuristics to order quiet moves.

Developer: Jeffrey An, Michael An
License: GNU General Public License v3.0

Laser is written in C++. Learn C++ with our recommended free books and free tutorials.

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