After having seen Brazil win its match against Chile 3-2 on penalties, I was wondering how the overtime is played.
Is that sudden death?
There is no sudden death in football, overtime (OT), or extra time (not to be confused with stoppage/additional time) as it's called in soccer context, is played in two halves 2 x 15 mins.
FIFA tried the sudden death concept several years back, it was called Golden Goal. The idea was that the first goal in the OT would be the tiebreaker. It got quite a bit negative critique and this was replaced with Silver Goal (see the same link above), which was a thought to be a decent compromise between a sudden death and regular OT.
Both the golden goal and silver goal were removed from the Laws of the Game eventually.
No, this is not sudden death. Overtime is only played in the knockout stage (any match after group stage).
If the score is tied at the end of regulation, Overtime will be played. OT is 30 minutes, which is divided into two halves. At the end of OT if the score is still tied, teams move on to penalty shoot-outs. Notice that this means that in OT each team can score multiple goals!
The penalty shoot-outs work as the following: Each team has 5 tries and teams alternate their shots. A team wins if they score more goals than their opponent during these first 5 tries. Otherwise teams move on to sudden death, each getting one try at a time. If both teams score, or both miss in the try, they go for another round until a team scores while the other team fails to do so. The scoring team is the winner of the game.
"Overtime" is played after the 90 minute regulation time and this is 30 minutes long, split into 2 15 minute halves, if both teams are still drawing when this time is over, teams will then go to a penalty shoot out. the penalty shoot out works like this; both team take it in turns to take 5 penalties alternately each, and whoever has scored the most penalties wins, if both teams are still equal then sudden death penalties are taken. This is when both teams take it in turns to take a penalty, if the first team scores then the other team must score or they lose the game.
Hope this helped.