Event: Preston Club Championship

Opponent Rating Result
Andrew R De Santos 99 ½ - ½
Chris Soames 100 1 - 0
Geoffrey Pennington 143 ½ - ½
Graham J Ashcroft 163 0 - 1
Charalampos Patsos 100 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

201 = (605 + 400 * (2 - 1)) / 5)

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