Aether

A modular chess engine written in Rust.

• Magic bitboard-based move generation
• Alpha-beta search with iterative deepening
• Transposition tables with Zobrist hashing
• Move ordering: TT move, SEE, MVV-LVA, killer moves, history heuristic
• Null move pruning and late move reductions (LMR)
• Aspiration windows
• Quiescence search with delta pruning
• UCI protocol support

aether/
├── core/       - Core types: BitBoard, Move, Piece, Square, etc.
├── attacks/    - Magic bitboards and attack lookup tables
├── board/      - Board representation, make/unmake, FEN parsing
├── movegen/    - Move generation, legality, perft
├── engine/     - Search and evaluation
└── interface/  - UCI protocol implementation

Requires Rust stable (Edition 2024).

cargo build --release

cargo run --release

The engine communicates via UCI protocol. Use with any UCI-compatible GUI (Arena, Cutechess, etc.).

cargo test --workspace

Run the move-generation correctness suite:

cargo test -p movegen --test perft --release

perft is also available inside a UCI session:

printf 'position startpos\nperft 6\nquit\n' | cargo run --release

Generate magic constants (only needed after modifying move generation):

cargo run -p attacks --features codegen --bin gen_magics

Output: attacks/src/magic_constants.rs