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I am using the chart from casinobonuswhores:
LINK When I have 20 and dealer has 8 exposed, why do I just 'stand' and not double? Seems counterintuitive?
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Why would that be counterintuitive? You're in good shape with 20 vs 8.
The reason you stand is that it's +EV compared to all other options. It is +EV since you'll win a lot more often.