Event: U1850

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Opponent	Rating	Result
Peter R Laundy	1840	½ - ½
Hazel Bowler	1800	½ - ½
Greg Billenness	1780	0 - 1

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

1673 = (5420 + 400 * (0 - 1)) / 3)