Event: Guildford Qualifier

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Opponent	Rating	Result
Percy Godfrey	0	0 - 1
Devon Connor	0	0 - 1
Antony Siow	0	0 - 1

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

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