Event: Division 4

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Opponent Rating Result
Neville Layhe 137 0 - 1
Philip N Birks 138 0 - 1
Philip Wright 90 1 - 0
Paul Clapham 106 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

18 = (471 + 400 * (1 - 2)) / 4)

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