$10k Foxwoods - Small underpair multiway hand vs Danny Wong

[celticslegend]

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this is a good river to bluff raise, but as celtic mentioned if he is a sicko and a good hand reader he'll pick you off once in a while. His bet does look 100% like he's going to fold to a raise.

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how is this a good river to bluff raise? what hand is hero supposed to show up with a4? Maybe this is a good sized river bet to raise but it is certainly not a good river card to raise.