Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
David Halpin	63	1 - 0
Richard Tate	103	1 - 0
Michael Carrigan	54	1 - 0

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

473 = (220 + 400 * (3 - 0)) / 3)