Event: Division 1

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Opponent Rating Result
Nigel Birtwistle 202 0 - 1
Dragoljub Sudar 159 1 - 0
Murray D Smith 194 0 - 1
John T Swain 167 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

81 = (722 + 400 * (1 - 2)) / 4)

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