I don't know the answer for this. But I know long ago there was a T3 or Tthree here who made a fortune on Spanish 21 using his created side count Am2c (A minus 2 count). Maybe 7m9c works on Blackjack like Am2c works on Spanish 21. I don't use Am2c, but I respect Tthree. So if he said Am2c works, I accept his words. Meanwhile, bjanalyst did not show his knowledge on Blackjack yet, so I am skeptical on his claim.
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