Event: League Division 3

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Opponent	Rating	Result
Keith J Riach	1670	1 - 0
David Morris	0	1 - 0
Steve DG Huxley	0	1 - 0

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

957 = (1670 + 400 * (3 - 0)) / 3)