Event: Club Championship

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Opponent	Rating	Result
John G Cooper	1923	0 - 1
John Regan	1510	1 - 0
Darren Pickering	1567	½ - ½
Graham Smith	0	0 - 1
John Cox	1521	1 - 0

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

1304 = (6521 + 400 * (2 - 2)) / 5)