Event: Roger Goldsmith Div 1

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Opponent Rating Result
Robin Ewbank 1384 1 - 0
Peter Newton 1629 0 - 1
Daniel Finch 1274 1 - 0
Marcin Rodzik 1200 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1572 = (5487 + 400 * (3 - 1)) / 4)

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