Event: Roger Goldsmith Div 2

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Opponent	Rating	Result
Simon Marsden	1603	½ - ½
Peter Newton	1597	0 - 1
Nathan Weersing	1547	0 - 1

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

1316 = (4747 + 400 * (0 - 2)) / 3)