If you are on the ice and your team scores a goal you get a + if you are on the ice and the other team scores you get a minus...
Example if you are on the ice when your team scores 2 goals and on the ice when the other team scores 1 goal you would be a +1
but if you are on the ice when your team scores 1 goal and the other team scores 2 you would be a -1 likewise if the number is the same you would be a +/- 0.
Just add and subtract the numbers at the end of the game and you get your +/- for the game, do the same for the season and you get the +/- for the season, just add/subtract the +/- from each game
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