Event: Roger Goldsmith Div 1

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Opponent Rating Result
James A Briginshaw 1768 0 - 1
Kelvin Hunter 1694 1 - 0
Marcin Rodzik 1442 0 - 1
Linhao Sha 1400 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1376 = (6304 + 400 * (1 - 3)) / 4)

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