Event: Club Championship

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Opponent	Rating	Result
Steve Burnell	0	½ - ½
Joe Murray	0	½ - ½
Dennis A White	0	0 - 1
Ray Garside	0	1 - 0
Simon Matthews	0	0 - 1

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

-80 = (0 + 400 * (1 - 2)) / 5)