Event: Summer League Division 4

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Opponent	Rating	Result
Oliver Gray	1487	0 - 1
Emirasan Umerov	1185	½ - ½
Stephen Gibson	1509	0 - 1
David Margerison	1459	0 - 1
Emirasan Umerov	1185	0 - 1
Dale Bannister-Gregory	1493	1 - 0
Ben J Fletcher	1271	0 - 1

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

1141 = (9589 + 400 * (1 - 5)) / 7)