Both Hands

Five wins, but three loses

Both Hands uses a hexagonal board of 61 cells. Light opens with one stone; every later turn contains two placements, and each new stone must touch a stone already on the board.

A straight line of five or more wins immediately. An exact line of three loses just as quickly, including when the first placement of a two-stone turn creates it, so every attack also carries a trap.

The opponent answers in pairs

The opponent is a Monte Carlo tree-search engine compiled to WebAssembly. The tested opening placed one light stone in the center; the engine returned two dark stones, raised the move counter from zero to three, and handed back a full two-placement turn.

A four with a gap is especially dangerous because filling or blocking that gap can consume both placements. Choose whether to play first or second, then raise the AI budget when the quick setting stops finding enough defensive lines.

A rule set selected by self-play

The published result resembles Yavalath but doubles the pace with two stones after the opener. A documented URL code can also load any of the other searched rule sets for players who want to examine how one changed rule reshapes the board.