[king_of_drafts]

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I think that a random two pair like 45 bets a lot bigger on turn for fear of being counterfeited or for fear of a spade coming and either giving him the losing hand or killing his action. I also think that top pair strong kicker bets bigger on the turn for similar reasons. As to whether this could be a stone-cold bluff I think the chances are probably better than you think but I agree it is not a huge part of his range.

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While this may be true (I don't really think it is), it is not an important enough point to hinge your decision on it.