atomic-movegen

A Rust library for legal move generation in atomic chess.

Features

Legal move generation (pseudo-legal + legality filtering)
FEN parsing and output
Perft (performance test) recursion
Blast-on-capture, COMMONER pseudo-royalty, pawn blast immunity

Usage (library)

use atomic_movegen::board::Board;
use atomic_movegen::perft;

let mut board = Board::new();
let nodes = perft(&mut board, 3);
assert_eq!(nodes, 8902);

Usage (CLI perft)

cargo run --example perft "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1" 4

Output: 197326

Verify against known perft values

The repository ships with 41 test positions and their expected node counts at depths 1–6 in perft_values.md. Use the verify_perft example to run all of them:

# Quick check at depth 3 (~5 s)
cargo run --example verify_perft 3

# Full verification at depth 6 — use --release for acceptable runtime
cargo run --example verify_perft --release

The tool exits with status 0 if every position matches, or 1 on any mismatch. Depth 6 traverses billions of nodes; the --release flag is essential for a timely result at that depth.

License