Event: Roger Goldsmith Div 1

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Opponent	Rating	Result
Mark Lim	1940	0 - 1
Ruben Evans	1821	0 - 1
David Short	1740	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1700 = (5501 + 400 * (1 - 2)) / 3)