Event: Roger Goldsmith Div 2

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Opponent Rating Result
James A Briginshaw 1795 0 - 1
Charles J Richmond 1617 1 - 0
Stephen Spurgeon 1500 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1637 = (4912 + 400 * (1 - 1)) / 3)

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