Event: Roger Goldsmith Div 1

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Opponent Rating Result
Michael Kowalczyk 1422 1 - 0
Charles J Richmond 1583 1 - 0
Simon Marsden 0 0 - 1
Marcin Rodzik 1200 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1251 = (4205 + 400 * (3 - 1)) / 4)

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