Event: Roger Goldsmith Div 1

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Opponent Rating Result
Paul McMahon 1905 0 - 1
Haroon Majeed 1970 ½ - ½
Haroon Majeed 1904 0 - 1
Paul McMahon 1944 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1831 = (7723 + 400 * (1 - 2)) / 4)

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