Event: Senior School House Chess Competition

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Opponent	Rating	Result
William Rishmawy	1202	0 - 1
Zail Gill	0	0 - 1
Joseph Garrett	0	1 - 0

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

267 = (1202 + 400 * (1 - 2)) / 3)