Event: Guildford FIDE Congress

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Opponent	Rating	Result
Colin Purdon	0	0 - 1
Adam Sefton	0	0 - 1
David Carpenter	0	0 - 1
Timothy Foster	0	0 - 1
Sebastian Twisk	0	½ - ½

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

-320 = (0 + 400 * (0 - 4)) / 5)