Event: Division 4A

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Opponent Rating Result
Dan German 1633 0 - 1
Richard Barnes 1466 ½ - ½
Jack Britton 1993 1 - 0
Juan Pastuszak 1431 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1631 = (6523 + 400 * (1 - 1)) / 4)

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