Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Peter Gregory	102	0 - 1
Alan Riddle	79	0 - 1
John Swiers	0	1 - 0
David Harasym	138	0 - 1
Arthur Thompson	0	1 - 0

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

-16 = (319 + 400 * (2 - 3)) / 5)