Event: Harrogate Evening League 2022 season

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Opponent	Rating	Result
John Swiers	1378	1 - 0
David Halpin	0	1 - 0
Stuart Wild	0	1 - 0

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

859 = (1378 + 400 * (3 - 0)) / 3)