TriGo
Keywords: Variant
TriGo is implemented at iggamecenter. Its full rules are described
here.
Essentially, it is go played on a triangular lattice within a hexagon. Each move consists of playing two stones (except for the first move of the game, where only one stone is played).
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Strategy
One difference to Go is that, since one is allowed to place two stones in one turn, it is necessary for groups to have three eyes to be alive.