Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Chris Tatham	123	1 - 0
Brian H Coop	165	1 - 0
John Grasham	139	1 - 0

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

542 = (427 + 400 * (3 - 0)) / 3)