Event: Division 4

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Opponent Rating Result
Isaac Oakes 0 0 - 1
Susan E Chadwick 1468 ½ - ½
David Bradley 1364 1 - 0
Thomas Williams 1526 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1190 = (4358 + 400 * (2 - 1)) / 4)

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