Event: Durham League Division B

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Opponent	Rating	Result
Ilya Bowman	1450	0 - 1
Sam Ball	1429	0 - 1
Nick Tadd	1177	1 - 0
Andy Proudfoot	1531	0 - 1

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

1197 = (5587 + 400 * (1 - 3)) / 4)