[SGS]

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He didn't check the turn through with a hand that beats QQ

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I have seen people do this before with KK or AA where they are fearing the turn checkraise.

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Quite likely he has the AK/AQ flush draw in diamonds and is calling because of the pot size and your possible weakness

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I really doubt he is calling the river with either of these hands. Especially with a possible caller behind him that capped pre-flop and bet the flop.

SGS