Event: Division 4

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Opponent Rating Result
Roger Bray 1520 ½ - ½
Philip Sykes 1523 0 - 1
Peter Rose 1465 1 - 0
Tony Brothwood 1610 0 - 1
Kevin Brooks 1548 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1373 = (7666 + 400 * (1 - 3)) / 5)

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