Event: Division 2

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Opponent Rating Result
John Foo 1487 0 - 1
Stefan H Reiss 1371 ½ - ½
John Foo 1505 1 - 0
Thomas Rampling 1759 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1431 = (6122 + 400 * (1 - 2)) / 4)

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