The most common variations of card counting in blackjack are based on statistical evidence that high cards (especially aces and 10s, and to a lesser extent 9s) benefit the player more than the dealer, while the low cards, (3s, 4s, 6s, and especially 5s, and to a lesser extent 2s and 7s) help the dealer while hurting the player. A higher concentration of high cards benefit the player in the following ways: