Event: Harrogate Evening League 2022 season

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Opponent	Rating	Result
John Swiers	1371	1 - 0
Richard Tate	1526	½ - ½
John Tate	0	1 - 0
Jacqui Boothman	0	1 - 0
David Halpin	1167	1 - 0

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

1133 = (4064 + 400 * (4 - 0)) / 5)