[piiop]

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If we lead and get raised by the preflop raiser, what does this do in terms of us getting calls from sets after that raise (before it gets back to us)? I think it lessens the chances that we get a call there. Also we don't even know the preflop raiser is very likely to have the nutflush, until he bets the flop. The checkraise line definitely will put more fear into the nutflush guy, but I don't think he ever folds anyway. However in the plus column, checkraising allows the pot to be huge back to anybody who just called the preflop raiser's bet (ie sets) and for them to close the action getting good odds on drawing. Therefore I think the checkraise line is actually better in this particular case.

*Edit* Actually the set person won't really be "closing" the action, but clearly looking at a better picture in terms of our commitment to the pot by the time we've checkraised. In my experience, top set (the most likely by far for someone to have) will optimistically put us both on calling hands he's drawing live against, one on the nutflush, the other on 2nd nutflush/lower set, and will go with us 3-way ai IF he's relatively sure a 3-way ai is reliable. IMO the checkraise makes this look much more likely than if we lead, get raised, and then he must call this raise unsure of if we're sweetening the pot.

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No.

If someone has a set they will call a flop bet then call the raise from pfr much more readily then they would if you c/r'ed the pfr.