This question is more like asking whether a card game qualifies as poker. There is no natural boundary with which to say that a game has so many variants from

This question is more like asking whether a card game qualifies as poker. There is no natural boundary with which to say that a game has so many variants from Platonic poker as to no longer qualify. Any abstraction proposed as a criterion for classification is just that, an abstraction, since poker is a socially-constructed category.