Event: Division 4

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Opponent Rating Result
Sean Smithson 1643 ½ - ½
Jerry Herrington 1931 ½ - ½
Andy While 1523 1 - 0
John A Amison 1600 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1774 = (6697 + 400 * (1 - 0)) / 4)

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