Accurate assessment of your winning chances is necessary when considering the cost of playing versus the payoff with pot odds. Hand evaluation uses the opponent models and game state to calculate estimates of the winning chances of your hand. However, since there are more cards to come on the flop and turn, the present strength of a hand is insufficient information. For this reason, post-flop hand evaluation is broken into two parts: strength and potential. Strength is the probability of a hand currently being the strongest and potential is the probability of the hand becoming the strongest (or of losing that status to another hand) after future cards have been dealt. Due to the computational complexity of potential for the pre-flop (the first two cards), evaluation in this stage of the game is given special treatment.