Event: William Jeffrey Cup - Margate 30

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Opponent	Rating	Result
James Cole	1506	0 - 1
John L Clarke	1384	½ - ½
John L Clarke	1384	1 - 0
Josh Glanville	1057	0 - 1
Keith C Findley	1755	0 - 1
Keith C Findley	1755	0 - 1
James Cole	1552	1 - 0

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

1370 = (10393 + 400 * (2 - 4)) / 7)