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Thank you for making this thread. It's a concept that everyone in the BC should study (me too). Nice to see Vinland getting his head around it too.
This is marginal hand play, something that I myself have only recently started to apply, but yes this will turbo boost your winrate once you start to use it.
I find this comes in most useful on the river, but it applies to every single street, including preflop.
If you have a moderate hand with some showdown value, you want that hand to go to showdown in a lot of cases. Look at Renton's ABCD theorem - we want to come out betting with our strong hands (because worse hands will call) and our bluffs (because we want them to fold), but not with the middle hands. We lose value whenever someone plays correctly and folds the worst hand to our bet, and we lose value when they call and we know we're beat. By betting with medium strength hands, we essentially turn them into a bluff hand (we don't want a call). So the better move is to try to keep our villain's worse hands in, and try to get some more value from them.
This thread is a good example. We see that Micro2macro has played to the river with tptk ip without raising, and then on the river he sees that he can't raise his tptk for value. Why? because the only hands that would call a river raise would be hands that beat TPTK, so he could never gain any additional money by raising here, it's just spewing chips. He has to just call.
But yes, being OOP on the river is a classic example. Say you have QQ, an overpair to the board, you're pretty sure you're ahead. But then an A comes on the river. You can't bet this ace, because your villain will only call if he's got the ace himself. You have to check/call (if you think they will bluff) or check/fold if they're honest. Only a hand that beats your queens would call that river bet, and worse hands will fold, making the river bet here very -ev.
Buy Theory of Poker and read up on river play, it will blow your mind.
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