Deft Reversi

Deft Reversi is a strong Othello program. It consists of the following two parts:

• Deft Reversi Web

  This is the implementation of the Othello UI part.

• Deft Reversi Engine

  This is the AI part of the Othello program.

Deft Reversi Web

• Playing with AI

  Deft Reversi Web

• About the Levels

  There are levels from 0 to 22. Level 0 plays randomly. It is thought that most people cannot win even around level 3. Levels above 20 are not recommended because they are heavy.

• Build

  • Rust and wasm-pack are required.

    git clone https://github.com/ikepggthb/deft-reversi.git
    cd deft_reversi/deft-reversi-web
    wasm-pack build --target web
    

Deft Reversi Engine

• Features
  • bitboard
  • negascout search (PVS)
  • Transposition table
  • Multi Prob Cut
  • Move ordering
    • Shallow searches using evaluation functions for move ordering
    • Speed priority search
      • Searching from moves that limit the opponent's legal moves
      • Used in the endgame
    • Iterative deepening
      • Storing best move in the transposition table for use in the next search
  • Evaluation function using machine learning (linear regression)
    • Used board patterns and the difference in the number of legal moves as features.

License

MIT License.