Event: Club Championship

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Opponent	Rating	Result
John B Atherton	1918	0 - 1
David Erwee	1473	0 - 1
Chris Cummins	1294	1 - 0

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

1428 = (4685 + 400 * (1 - 2)) / 3)