Event: Roger Goldsmith Div 2

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Opponent	Rating	Result
Nathan Weersing	1538	½ - ½
Anthony Chan	1726	0 - 1
Daniel Pugh	1637	½ - ½
Daniel Pugh	1600	1 - 0
Greg Thompson	1600	0 - 1

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

1540 = (8101 + 400 * (1 - 2)) / 5)