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About the engine/ directory

Purpose

engine/ explores and ranks best moves once legal moves already exist.

This layer evaluates positions, searches the game tree, and returns the best move it can find.

Place in the architecture

flowchart TD

    Other1("`...`")
    Other2("`...`")
    MoveGen("`
        **Move Generation**
        Legal move generation and king safety
        -
        inlcude/bitbishop/movegen/*.hpp
    `")
    Moves("`
        **Move Execution**
        Reversible move execution and move history
        -
        inlcude/bitbishop/moves/*.hpp
    `")
    Engine("`
        **Search Engine**
        Evaluation and search
        -
        inlcude/bitbishop/engine/*.hpp
    `")
    Interface("`
        **Interface**
        UCI protocol and search orchestration
        -
        inlcude/bitbishop/interface/*.hpp
    `")

    MoveGen --> Other1

    Moves --> MoveGen

    Engine --> Moves
    Engine --> MoveGen

    Interface --> Engine

    Other2 --> Interface
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Responsibilities

  • Evaluate positions
  • Search the game tree
  • Choose the best move available within the current limits

Inputs

  • movegen/ for legal moves
  • moves/ for apply/revert history during search
  • Board and evaluation data from the core headers

Outputs

  • Best-move decisions
  • Scores used by the protocol layer or analysis tools