The "Rule of 12" memory shortcut is a good way for beginners to get their soft doubles right.
It works for player A-2 thru A-7 and dealer up-card from 2-6
Basically you take the dealer's up-card, DOUBLE its value, and ADD the value of your non-Ace card:
If the total is 12 or more, you DOUBLE
If the total is less than 12, just HIT
Examples:
Dealer: 2, You: A-7. 2 x 2 = 4 + 7 = 11... so you don't double
Dealer: 4, You: A-4. 4 x 2 = 8 + 4 = 12... so you double
Dealer: 3, You: A-5. 3 x 2 = 6 + 5 = 11... so you don't double
etc. etc.
There's only a couple exceptions where it doesn't work: player A-7 vs dealer 2 on H17 shoe games, and A-3 vs 4 in double deck H-17...
-DBJT
P.S. Fred Renzey wrote about the "Rule of 9" similar memory trick for soft doubles too...
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