Event: Division 1

Opponent Rating Result
Clive A Frostick 2148 ½ - ½
Roger Emerson 2185 ½ - ½
Peter Hasson 2073 ½ - ½
Colin Purdon 2088 ½ - ½
Derek R Johnson 2013 1 - 0
Nigel White 2095 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2167 = (12602 + 400 * (1 - 0)) / 6)

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