Event: Roger Goldsmith Div 1

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Opponent Rating Result
Jan Balogh 1990 ½ - ½
Oliver J Lenton 1968 0 - 1
Jan Balogh 1998 ½ - ½
Alan PH Norman 1677 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1908 = (7633 + 400 * (1 - 1)) / 4)

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