Make Me 21

Well check out how you are able to cheat! And you know how, by the way? After all, the strongest wins this game, the one who is friends with math and can count to 21. Quite simply, for that would defeat your opponent you need to get 21 points, but if you rack 20, for example, while your opponent will be 19, you still won. It's very simple, but be careful, if you will more than 21, you automatically lose.