I'm reading Beat the Dealer and I'm confused why you hit when holding a hard twelve against a dealer up card of two or three. You stand on a hard twelve if the dealer shows a 4-6. Can someone explain why this is so?
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When the dealer has a two or three showing, it's less likely the he'll bust than if he has a four to six showing. You have to do lots of calculations to see when exactly when you're better off hitting or standing, but that's the basic reason.