Event: Division 2

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Opponent Rating Result
Colin R Ramage 1931 0 - 1
Mark R A Murrell 1857 0 - 1
Neville H Twitchell 1868 ½ - ½
Paul R Barclay 1797 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1663 = (7453 + 400 * (0 - 2)) / 4)

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