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#1
09-17-2007, 07:41 PM
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blackjack doubling soft hands A,7
What's the point of doubling A,7 if you should stand if it's not permitted? If hitting it isn't a good idea, why would doubling it be better?
I'm not sure why doubling soft A,x in general is beneficial to the player since it removes the player's option to take more cards and even the main dealer bust cards, 4,5 and 6, have only about a 40% chance of busting. My guess is the expected value on computer simulations is positive. 
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#2
09-17-2007, 08:30 PM
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Re: blackjack doubling soft hands A,7
You only double in situations where the dealer has a very high probability of busting. Obviously, when the dealer busts, you win whether or not you've improved the hand. When doubling A7, there are 7 cards that will improve or not harm the hand vs 6 cards that will harm it. If you can't double your wager -- there's no value to a draw that keeps your hand the same, so now its 3 improve vs. 6 harm.
Strategy tables, in general, simply show plays that have a higher expectation than the other available alternatives.
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#3
09-17-2007, 09:17 PM
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Re: blackjack doubling soft hands A,7
Okay, seven cards, A,2 or 3 will improve the hand or T,J,Q or K will not harm it. And six cards 4,5,6,7,8 or 9 will harm it. So A/7/faceORten versus 6 is favorable to the player since 6 will bust or draw to 17 over 50% of the time?
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#4
09-17-2007, 11:24 PM
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Re: blackjack doubling soft hands A,7
The 6 vs. A7X doesn't have to bust or draw 17 > 50% -- the combined expectation of 6vA7X, 6vA7A, 6vA72, 6vA73 simply has to be less than one half of the next best option (options are standing on A7 or playing as 8) to justify doubling.
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