Event: Harrogate Evening League 2021 season

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Opponent	Rating	Result
David Thorn	0	1 - 0
Jacob Smith	0	1 - 0
Andrew Zigmond	0	1 - 0

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

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