Event: Guildford FIDE Congress

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Opponent	Rating	Result
Joseph Morrison	0	½ - ½
Mark J Fulleylove	0	½ - ½
Louis Buckland	0	0 - 1
Julien M Shepley	0	0 - 1
Nathaniel Butcher	0	½ - ½

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

-160 = (0 + 400 * (0 - 2)) / 5)