Event: Division One

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Opponent Rating Result
Nigel S Towers 1807 0 - 1
Tony Preece 1887 1 - 0
Dave M Davies 1720 ½ - ½
Derek Green 1592 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1752 = (7006 + 400 * (1 - 1)) / 4)

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