Event: 4-board Division 3

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Opponent Rating Result
William I Wright 1610 0 - 1
Matthew Bell 1400 0 - 1
Jonathan R Slater 1550 0 - 1
Dan Malbon 1300 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1265 = (5860 + 400 * (1 - 3)) / 4)

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