Event: Hereford KO

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Opponent	Rating	Result
Will Slater	1712	1 - 0
Henry Spedding	1800	0 - 1
Roger Aris	1647	0 - 1

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

1586 = (5159 + 400 * (1 - 2)) / 3)