figrid-board

A library for the Five-in-a-Row (Gomoku) game, and the first Gomoku engine written in Rust.

Maintainership

As of 2026-04-20, primary maintainership has been transferred from the original author wuwbobo2021 to nicotina04. Future development targets a stronger NNUE-based engine while preserving the existing board/rule/tree library surface.

Roadmap

• Gomocup 2026 (submission deadline 2026-05-29 UTC, tournament June 5–7). Goal: submit a substantially stronger successor engine powered by the noru NNUE core.
• Search strengthening before submission: VCF / VCT tactical search, iterative deepening, transposition table.
• Known technical debt from the 0.3.x series is tracked in docs/INHERITED_TODO.md.

Build

Local / development — target the host CPU for maximum performance:

RUSTFLAGS="-C target-cpu=native" cargo build --release

Gomocup submission — -C target-cpu=native is wrong here, because the binary must run on the tournament's machines, not yours. The Gomocup 2026 announcement guarantees SSE4.1, SSE4.2, POPCNT, AVX, and AVX2, which is exactly x86_64-v3. Link the C runtime statically so the submission is self-contained:

RUSTFLAGS="-C target-feature=+crt-static -C target-cpu=x86-64-v3" \
    cargo build --release --target x86_64-pc-windows-gnu \
    --bin pbrain-figrid

(An additional build with -C target-cpu=x86-64-v4 for AVX-512 hardware may be submitted as a second zip entry; GomocupJudge picks the fastest compatible binary.)

Legacy users

Users who need the pre-Rust figrid-board as a Linux alternative to Renlib can download tag v0.20.