Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Philip May	94	1 - 0
David Harasym	135	0 - 1
Paul Pritchard	161	0 - 1
Ian Carrigan	113	1 - 0

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

126 = (503 + 400 * (2 - 2)) / 4)