Event: Division A

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Opponent Rating Result
Peter Barrow 0 0 - 1
Geoffrey Pennington 1749 ½ - ½
Paul N Fearnhead 1750 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

900 = (3499 + 400 * (0 - 2)) / 3)

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