Event: Cumnor Players Cup

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Opponent	Rating	Result
Nick Burrows	2021	1 - 0
Mark Sayers	1862	0 - 1
Mark Sayers	1862	½ - ½
Liam Glenn	1795	½ - ½
Liam Glenn	1795	1 - 0
Nigel J Moyse	2035	1 - 0
Ian Bush	1943	0 - 1
Ian Bush	1943	½ - ½

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

1957 = (15256 + 400 * (3 - 2)) / 8)