Event: Division 4

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Opponent Rating Result
Brian Wagstaff 94 ½ - ½
Martin Gill 119 ½ - ½
Philip N Birks 138 ½ - ½
Simon Layhe 117 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

17 = (468 + 400 * (0 - 1)) / 4)

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