Event: Division 1

Opponent Rating Result
Ian R White 157 1 - 0
A Clive Walley 157 1 - 0
Robert Ashworth 159 1 - 0
Alun Richards 135 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

452 = (608 + 400 * (3 - 0)) / 4)

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