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Folks, division at this level is fourth grade math! If you can't multiply and divide then you have a fundamental obstacle to learning to play advantage blackjack. You are making this harder than it needs to be.

Time better spent learning to accurately estimate remaining decks.

One deck resolution at 6 and 8 deck. Perhaps more granular at deep penetrations.

Half deck resolution at 2 deck. Determine true count by multiplying running count by 2 (# half decks in a deck) and divide by number of half decks remaining.

Quarter deck resolution at one deck. Determine true count by multiplying running count by 4 (# quarter decks in a deck) and divide by number of quarter decks remaining.

The hard and risky part is determining an accurate number of decks remaining not the math.

Luck is nothing more than probability taken personally!

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