Well... if when you say competently are you talk about know the rule, and some strategy to play, I can say that I play so many poker variants, but if you are talking about be profitable, I can't say, cause I am a middle player, I have played a lot of styles, and I don't take it so serious, in generally I play more freerolls, and because of this I actually don't have much options, but some time ago, in PS I had played so many variations, I like theses poker variantes, but there are no much options, few rooms have these games.