Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Arthur Thompson	0	0 - 1
Andrew Zigmond	129	1 - 0
John Swiers	0	0 - 1

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

-90 = (129 + 400 * (1 - 2)) / 3)