*Casino game associated with the sum of this puzzle's shaded squares (9)

I believe the answer is:

blackjack

(Other definitions for blackjack that I've seen before include "Vingt-et-un - pirates' ensign" , "A card game in which the object is to beat the bank" , "2 8 [CASINO GAME]" , "Club" , "Casino card game" .)

I've seen this clue in The New York Times.

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