Event: Division B

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Opponent Rating Result
David E Aspinall 1719 ½ - ½
Sean Fitzgibbon 1780 0 - 1
Patrick N Coleman 1511 0 - 1
Graham Smith 1450 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1515 = (6460 + 400 * (1 - 2)) / 4)

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