Event: Division 4

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Opponent Rating Result
Alan J Nelder 1645 0 - 1
Ronald Watson 1441 1 - 0
Francis Roe 1562 1 - 0
Andrew Thompson 1579 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1657 = (6227 + 400 * (2 - 1)) / 4)

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