Event: Club Championship

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Opponent Rating Result
Robert J Arthurton 1630 0 - 1
Keith May 986 0 - 1
Paul Terry 1722 0 - 1
Roger Clarke 1337 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1219 = (5675 + 400 * (1 - 3)) / 4)

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