Anticipation

There is one particular anticipation mistake that takes the cake. It's the simplest one, and the most common. In a headsup pot, when you bet or raise, your opponent can only fold, call, or raise. If he folds, your next betting decision is not until the next hand. If he calls, your next betting decision is not until the next street. If he raises - and only if he raises - you must act now. That is why, when you bet or raise, there is strategically nothing to anticipate except a raise, and therefore, if you have not anticipated a raise, you not only made a mistake, you made the only mistake possible.