Using Countif and avoiding duplicates

Hi,

I'm trying to count up the cumulative wins and losses of a respective teams schedule. However, since teams play each other more often than once, there are repeat records. What I would like is to add up the number of wins and losses on the schedule I've attached but not referencing the same teams record more than once. I.e. if you play Seattle 3 times, you only count there wins and losses once, not 3 times. This is going to be a growing data sheet since teams play almost everyday. Also, since it is early in the season, there will be more teams added to the schedule as the games are played. Not sure if this matters...

Thanks!

-Dan