Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Mike R Stokes	188	0 - 1
Brian H Coop	159	½ - ½
Frank T Sheldrick	143	0 - 1
David W Adam	143	0 - 1

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

-142 = (633 + 400 * (0 - 3)) / 4)