Event: Friendly Matches

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Opponent	Rating	Result
Blaine McGrady	130	0 - 1
Patrick N Coleman	106	½ - ½
Brant R Nuttall	142	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-7 = (378 + 400 * (0 - 1)) / 3)