Event: John Davis 6200 League

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Opponent	Rating	Result
Steven Scullion	1418	0 - 1
Ben Gannon	1395	0 - 1
James Redman	1300	0 - 1

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

971 = (4113 + 400 * (0 - 3)) / 3)