In Norm's book (Modern Blackjack) within Chapter Minus 1, Section "Variations/Double Down Rules/Double After Split (DAS)" the last sentence says "You must change your strategy to realize the full gain in advantage". Could someone please expand upon this. I play these Double Downs like I would any other Double Down (e.g. dd on a 9 vs a dealer 3 thru 6) but Norm's statement suggest there is more that I need to know. Thanks in advance !!!!
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