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At a NEUTRAL count with A 10 against a 6, your EV to double down is +0.666, while claiming a 6-to-5 blackjack will give you an EV of +1.2, which means it’s clearly not worth it. Even as you go into positive counts, at true 4, doubling 21 will give you an EV of about +0.774, making it not worth it still