[Wintermute]

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If called, how would you play a high flush card or low non-flush card (I assume a low flush card = fold?)

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Do we assume that these possible turn cards will induce someone else to bet into the OP? Let's say that is the case first. Then for the high flush card case, I'll usually call to try to fill up, but will fold if that misses and get bet into again on river. For low non-flush, I'll call a less-than-pot bet but not be happy about it, because no way can I scoop; a pot-bet is much tougher decision, you should fold but maybe call for Shania's sake, or if there are enough callers. For low flush card, if bet into, fold.

Many times, though, it will check around to you since you've taken the lead preflop and flop. In that case, the decision is easy: check behind.