Event: Roger Goldsmith Div 2

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Opponent	Rating	Result
William McGinn	70	1 - 0
Robert Lepley	93	½ - ½
Michael MJ Osborn	106	0 - 1

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

90 = (269 + 400 * (1 - 1)) / 3)