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The most basic (and arguably the most effective) card counting system is the "plus minus" circle. All cards are assigned a significance. Low cards, 2-6, are assigned a worth of plus one. Medium cards, 7-9, are discounted, with something of nil. High cards, 10-A, are assigned a value of negative one. Even though the game proceeds, the total count is named a the running count. The running count divided coming from the number of decks already in play is named the true cou