The High Low count is one of the earliest devised card counting systems. It is one of the simplist systems out there and is the most commonly used.

Betting Correlation 0.97
Playing Efficiency 0.52
Insurance Correlation 0.76
Balanced Count? Yes
Side Counts? No
True Count Divisor 1 Deck
Take Insurance at +3 TC

Card Values

Card 2 3 4 5 6 7 8 9 T A
Value +1 +1 +1 +1 +1 0 0 0 -1 -1

Charts