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Consider
the entry for hard 16 vs. a dealer 9. The Preferred strategy
matrix entry is A, meaning we stand if the running count
is greater than or equal to this value, and hit otherwise.
Regardless of the number of decks in play, the value of
A is always +4. This means that if we're holding a hard
16 and the dealer has a 9 up, we stand if the RC is +4 or
more; otherwise we hit.
Is this logical? Recall that basic strategy for this play
is to hit. We'd expect to deviate from the basic strategy
and stand if there were a large fraction of high cards left
in the deck. Our +4 pivot indicates that a large number
of high cards remain. Since our chance of busting is large,
it makes sense in this case to stand.
A study of the other strategic plays will convince you that
these, too, are made only at opportune (and logical) times.
In particular, most of the double downs are made when the
count is high and there's a correspondingly high chance
of drawing a ten to the doubled hand.
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