Event: Roger Goldsmith Div 2

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Opponent	Rating	Result
Anthony Chan	1600	0 - 1
Michael MJ Osborn	1548	1 - 0
Laurie Pott	1791	½ - ½

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

1646 = (4939 + 400 * (1 - 1)) / 3)