Event: Division 2

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Opponent Rating Result
Donna Chadwick 1297 1 - 0
William Earnshaw 1047 ½ - ½
Grieg Ichim 1521 0 - 1
James Parker 873 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1285 = (4738 + 400 * (2 - 1)) / 4)

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