A Chess Engine written in Rust .

Related tags

Game development game rust chess-engine chess
Overview

Kelp

Rust-CI

Kelp

Kelp is a UCI compatible chess engine written in Rust Using standard chess algorithms.

Kelp is work in progress. Currently, it can be used as a UCI engine But evaluation needs a lot of work to be done especially the endgame evaluation.

Play Against It

Lichess:- https://lichess.org/@/KelpBot

Kelp is UCI compatible it should work with any UCI compatible gui, so far kelp has been tested on Pychess, BanskaiGUI, Arena and cutechess.

Example

Example

Installation

Kelp Binary can be downloaded from Releases page for Windows and Linux.

Build

cargo build --release

About

Board

  • A bitboard[12] array is used to represent the board. Each piece is mapped to a bitboard.
  • standard make/unmake move functions are used, unmake move use move history to unmake instead of copy/take approach.

Search

  • Iterative deepening with aspiration windows.
  • Negamax with alpha-beta pruning.
  • Principal Variation Search.
  • Late Move Reduction.
  • Null Move Pruning.
  • Quiescence Search.
  • Transposition Table.
  • Move Ordering
    • MVV-LVA
    • Killer Moves
    • History Heuristic
    • PV Table

Evaluation

  • Piece Square Tables
  • Tapered Eval
  • Basic King Safety
  • Mobility & Basic Mop Up Evaluation
  • Passed Pawns, Isolated Pawns, Doubled Pawns

TODO

  • Pawn Structure
  • Endgame Evaluation
  • Better King Safety and Pawn Shield
  • Better Mobility
  • Better Mop Up Evaluation
  • fix threefold repetition completely (sometimes it doesn't work)
  • fix bad evaluation and moves (sometimes it makes bad moves)
  • Opening Book
  • Better Move Ordering using hash ordering
  • Refactor code and make modules private
  • Complete Library support
  • Better Time Management
  • Integrate Syzygy Endgame Tablebases
  • Integrate Stockfish's NNUE

Tests

Kelp Implements some basic tests suchs as perft test, fen parsing and incremental update of zobrist hash. Perft results are compared with Perft Results and incremental update of zobrist hash is compared with scratch generation of zobrist hash.

cargo test

References & Resources

Resources that helped me a lot in making this engine.

License

Kelp is licensed under the GNU General Public License v3.0. See LICENSE for details.

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