Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Jonathan Round	170	0 - 1
Mark Daley	171	½ - ½
Mark W Rogerson	174	0 - 1
E Gordon Marks	136	1 - 0
Mike R Stokes	188	½ - ½

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

88 = (839 + 400 * (1 - 2)) / 5)