[GabrielBen]

A game of Go can be legally infinite due to recaptures. (player passes 360 times, then eats the entire board and it starts over).

It's also a natural infinite game due to Kos which can be the best move to play. This requires a set of extra rules to prevent. (Ko, superKo, triple kos, etc)

[tromp]

I assume superko as is standard in several rulesets to prevent infinite play.