Event: Clough (Handicap)

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Opponent Rating Result
Peter D Ward 120 ½ - ½
Robert Derrington 0 1 - 0
Karim Khan 151 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

90 = (271 + 400 * (1 - 1)) / 3)

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