Event: Division 3

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Opponent Rating Result
Dave J Williams 1710 ½ - ½
Oliver Thornley 1780 0 - 1
Andrew Milborrow 1405 1 - 0
Michael J Passmore 1654 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1637 = (6549 + 400 * (1 - 1)) / 4)

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