[Isura]

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I am sure CO doesn't have a made flush or straight at this point, but other than that, who knows

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I cringe when I hear statements like this. Your statement is contradictory. You say that you are able to eliminate a large range of CO's hands but yet have no idea what he could have. Unless you are Helmuth and can see into your opponents soul (sarcasm), you're basing your decision on too narrow of a hand range for your opponents, especially at this limit. Anyways, fold.