Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Paul Pritchard	161	0 - 1
E Gordon Marks	136	0 - 1
David Halpin	61	1 - 0
David Harasym	138	0 - 1

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

-76 = (496 + 400 * (1 - 3)) / 4)