Event: Simon Cup

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Opponent Rating Result
Steve Whatmore 1820 0 - 1
Stephen Luff 1480 0 - 1
Roger VH Butters 1878 1 - 0
David J Stuart 1349 0 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1593 = (5178 + 400 * (1 - 2)) / 3)

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