Event: GP4 - December

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Opponent	Rating	Result
Rose Burgess	1324	0 - 1
Samuel Merchant	1550	0 - 1
Steve Merchant	1523	1 - 0

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

1332 = (4397 + 400 * (1 - 2)) / 3)