Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Brian D Corner	103	1 - 0
Richard Tate	103	1 - 0
David Harasym	135	0 - 1

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

247 = (341 + 400 * (2 - 1)) / 3)