Event: Division 2

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Opponent Rating Result
Stephen D Blewitt 1889 1 - 0
Derek Cosens 1677 ½ - ½
Ian Dennis 1674 ½ - ½
Michael K Taylor 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1510 = (5240 + 400 * (2 - 0)) / 4)

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