Event: Silver Rook

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Opponent	Rating	Result
James Annan	1807	½ - ½
Anthony A Gilpin	1760	0 - 1
Elinor Gorrell	1688	½ - ½
Brendan Briggs	1424	1 - 0
Paul Butterworth	1876	0 - 1
Angel Monterde	1751	½ - ½
David Booth	1783	0 - 1

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

1613 = (12089 + 400 * (1 - 3)) / 7)