Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Michael Johnson	135	1 - 0
Anthony Ibbitson	138	1 - 0
Mike R Stokes	170	0 - 1

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

281 = (443 + 400 * (2 - 1)) / 3)