Blind war...river checkraise?

[shemp]

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1. A river check raise will often cost you a bet when he has two pair and you would have got 3 bets and when he has one pair hands that plan to check behind.

2. Betting the river costs you a bet when he is on a bluff and doesn't bluff raise and when he has a one pair hand that planned to bet the river and call a check raise.

I think the answer is 2 and it isn't that close.

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I think your reasoning is only correct if he never river raises 2 pair, and I don't think that's a fair assumption.

Josh

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"A river check raise will often cost you a bet when he has two pair and you would have got 3 bets"

Is this not clear?