Event: Division One

Opponent Rating Result
Matthew J Harborne 2148 1 - 0
John A Edge 2087 ½ - ½
Mike J Groombridge 1709 1 - 0
Donald J Mason 2161 ½ - ½
Mark A Cundy 1957 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2172 = (10062 + 400 * (2 - 0)) / 5)

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