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[Calling and using the button to play way ahead/way behind is easy.

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Not with 33. You're NEVER WA by definition when you hold 33. This is precisely the point.

FTOP says that YOU will be the most likely to make mistakes, not your opponents, due to the lack of flops that look favorable to you. Absent a set, your hand value will necessarily be ambiguous on all streets.

Your opponent, by contrast, will make a pair 1 in 3 flops, and if he's holding big overs, or ace-rag, he'll often peel the turn and make a pair bigger than your 33 about 10% of the time. So he'll like many boards by the turn.

Three betting this preflop means that under FTOP, your opponent is going to be more likely to make mistakes, because he will put YOU on the wrong hand, and will sometimes fold a better hand on a scary flop or turn.