2,3,4,5,6 = plus 1

10, J, Q, K, A = minus 1

7,8,9 = 0

Everytime a card is dealt you add or subtract from the running count. You should begin at the very start of a new shoe. A positive count means that there are more 10s in the deck, which is a favorable situation. You pump up your bet when the count is like +6 or better.

Counting combined with basic BJ strategy will give the player a sleight statistical advantage. However, just like poker there are bad beats and even when the count is favorable you can lose. MIT was up almost a million and lost most of it back because of a cold streak.

The above is the most basic counting strategy. The professionals can track cards and have some more advanced techniques.