Back when he was serving as Buffalo’s goaltending coach in the early 2000s, Jim Corsi wanted to devise an accurate barometer for measuring a goalie’s true workload. Reasoning that his netminders had to physically react to a broader range of on-ice stimuli than merely shots on goal, Corsi decided to track missed shot attempts and blocked shots as well.
Little did he realize at the time that his calculation would spark a revolution in the field of hockey analytics. Soon his brainchild served as the basis for a number of puck possession stats, including the Corsi for.