Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Jonathan Round	165	1 - 0
Paul May	154	½ - ½
Frank T Sheldrick	143	1 - 0
Michael Johnson	135	1 - 0

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

449 = (597 + 400 * (3 - 0)) / 4)