[SABR42]

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I'd check, as the flush got there. If he doesn't have it, he will afraid that you just hit it.

If the ace weren't a diamond this would be an easy shove with SB's stack size.

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i like a check behind

also, if the Ace isnt a diamond and you shove, what is he calling with that we can beat?

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SB has like half-pot left in his stack. He's called this far because he doesn't believe OP has a hand. He's likely to call again. The diamond does change things however.