Event: Division 4

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Opponent Rating Result
Neville Layhe 137 0 - 1
Kenneth J McNulty 129 ½ - ½
Stephen J Emmerton 131 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-1 = (397 + 400 * (0 - 1)) / 3)

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