Event: Haslemere Trophy

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Opponent Rating Result
Geoffrey A Foxon 1775 0 - 1
Peter J Horlock 1566 1 - 0
Geoffrey A Foxon 1775 ½ - ½
Peter J Horlock 1566 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1571 = (6682 + 400 * (1 - 2)) / 4)

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