Event: Roger Goldsmith Div 2

Opponent Rating Result
Greg Thompson 1613 1 - 0
James Irwin 1793 0 - 1
Steven M Ashworth 1515 1 - 0
Simon Marsden 1577 1 - 0
Charles J Richmond 1600 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1860 = (8098 + 400 * (4 - 1)) / 5)

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