Event: Division 2

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Opponent Rating Result
Malcolm H Cooper 1818 ½ - ½
Derek R Johnson 2013 0 - 1
Alastair Mitchell-Baker 1908 1 - 0
Mark Payne 526 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1566 = (6265 + 400 * (1 - 1)) / 4)

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