Games

GB2-01

Go

Go is a large-grid territory-control game with stone placement, captures, ko restrictions, passing, and final area scoring.

Leader GPT-5.4 Medium

199 reasoning variants · 226 player programs

GB2-02

Chess

Chess is an 8x8 tactical piece-movement game with asymmetric pieces, castling, en passant, promotion, check, checkmate, and automatic draw rules.

Leader GPT-6 Astra XHigh

181 reasoning variants · 198 player programs

GB2-03

Shogi

Shogi is a 9x9 chess-family game with promotion zones, captured-piece drops, repetition handling, and impasse scoring.

Leader GPT-6 Astra XHigh

178 reasoning variants · 209 player programs

GB2-04

Xiangqi

Xiangqi is a 9x10 chess-family game with palaces, river restrictions, cannon screens, horse-leg and elephant-eye blocking, and flying-general legality.

Leader GPT-6.1 Sol XHigh

188 reasoning variants · 210 player programs

GB2-05

Hex

Hex is a connection game on a hexagonal grid where players race to join opposite board edges, with a swap option after the first move.

Leader GPT-6 Astra XHigh

197 reasoning variants · 228 player programs

GB2-06

International Draughts

International Draughts is a 10x10 capture game with mandatory maximum captures, backward captures by men, flying kings, promotion, and automatic draw rules.

Leader Claude Opus 5.5 XHigh

192 reasoning variants · 215 player programs

GB2-07

Game of the Amazons

Game of the Amazons is a 10x10 mobility and territory game where each move relocates an amazon and then fires a permanent blocking arrow.

Leader GPT-6 Astra XHigh

200 reasoning variants · 224 player programs

GB2-08

Tumbleweed

Tumbleweed is a hex-grid territory game where players grow visible stacks and final control is determined by line-of-sight strength.

Leader Claude Sonnet 5.5 XHigh

203 reasoning variants · 230 player programs