[Azhrarn]

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Your call will probably make CO think it isn't worth a call. If he were ahead of you no way would I overcall, but I think the only way he rivered a straight is with Td or 6d.

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He's very loose pre-flop. 76 and T9 would both flop OESDs, and they are definitely within his coldcalling range, suited and offsuit. Also, I don't think he would fold a pair on the flop, so add 65, T8, and JT.

Anyway, there's no way he folds a better hand than mine on the river, and he would call with quite a few worse ones.