Event: Division 4B

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Opponent Rating Result
John D Robinson 1585 1 - 0
Alastair JD Marston 1704 0 - 1
Peter Marks 1747 ½ - ½
Frank De Vocht 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1259 = (5036 + 400 * (1 - 1)) / 4)

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