The knockout stage is a single-elimination tournament involving the sixteen teams that qualified from the Group stage of the tournament. There are four rounds of matches, with each round eliminating half of the teams entering that round. The successive rounds are: Round of 16, Quarter-finals, Semi-finals, Final. There is also a play-off to decide third/fourth place. For each game in the knockout stage, a draw is followed by thirty minutes of extra time (two fifteen minute halves); if scores are still level there is a penalty shootout (at least five penalties each, and more if necessary) to determine who progresses to the next round. Scores after extra time are indicated by (AET), and penalty shoot outs are indicated by (PSO).