Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Michael Carrigan	54	½ - ½
Charles Usher	22	1 - 0
Peter Gregory	112	0 - 1
Cameron Funnel	134	0 - 1

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

-20 = (322 + 400 * (1 - 2)) / 4)