Criticisms
While Corsi may provide a more accurate evaluation of players' contributions to a winning effort than plus-minus (giving a plus to players who are on the ice when a goal is scored and a minus to players who are on the ice when a goal is scored on their own net), it does have its own criticisms. For example, a player is on the ice for 30 shots on net and 20 shots against. Based on this, his Corsi number will be +10, but based on his actual play on the ice, he really created five shot attempts and gave up 15 shot attempts to the other team, meaning his Corsi number should actually be -10. This is because he was playing with better players around him and that boosted his Corsi number. Essentially, a good player playing consistently with bad players will have a lower Corsi number, while a good player playing with great players will get a boost.
Schaut´s ihm ganz einfach zu ....