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he delayed for almost 25 second before calling with 8 [img]/images/graemlins/spade.gif[/img],7 [img]/images/graemlins/spade.gif[/img]

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As you probably know this is a common technique/ploy to try to get a free card, when someone has a draw.

I think a call on the turn and check/call the river is an OK play. Pushing I think is incorrect unless you think he will pay you off with a set or 2 pair.