Event: William Jeffrey Cup - Margate 30

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Opponent	Rating	Result
Leon A Garfield	1275	1 - 0
Keith C Findley	1849	0 - 1
Michael H Micklethwaite	1700	½ - ½
Michael H Micklethwaite	1700	1 - 0
Leon A Garfield	1271	0 - 1
James Cole	1590	0 - 1
James Cole	1590	0 - 1

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

1454 = (10975 + 400 * (2 - 4)) / 7)