Event: Silver Rook

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Opponent Rating Result
Mark Shelmerdine 127 1 - 0
Dean Hepworth 109 ½ - ½
Peter Gregory 102 0 - 1
Elinor Gorrell 89 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

107 = (427 + 400 * (1 - 1)) / 4)

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