Event: Division 1 - Open

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Opponent Rating Result
David J Archer 1997 0 - 1
Martin Goldschmidt 1930 ½ - ½
George A Darling 1912 1 - 0
David J Archer 1997 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1959 = (7836 + 400 * (1 - 1)) / 4)

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