[Hince]

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It's never incorrect to raise with the best hand (ie. it is never -EV)

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This is simply not true. Should I open shove TT preflop? I'm way ahead of everyone's range. Of course I'm not ahead of their calling range and it's -EV. There are also plenty of cases where I can raise a hand like that which is ahead of their range but will only get called by better hands. That's what we call "turning your hand into a bluff". Furthermore, the "showdown value" of a hand does not matter if you can't get to showdown, and there are often cases where you believe you are ahead of someone's range but still folding is the most +EV decision. (an example might be if you have something like 88 on a 7-high flop with flush draw, you bet out and villain min raises in position. You're ahead of his range but should probably just fold).

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Did I say anything about being ahead of his range? No.. I don't think I did... I said we had the best hand. My quote is always true.

If he plays his hand face up, and you are ahead. Pushing is +EV (although it may not be the most +EV play).

Since he isn't playing his hand face up we put him on a range of hands. If we are ahead of that range it makes sense to raise an amount that will get called by lesser hands. We want to maximize our return, so when ahead we should be more willing to put in more money.

We win more money if we push our edges, and maximize our chances of winning a pot. Reraise preflop does that in both ways.