Event: York Club Championship

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Opponent	Rating	Result
Derek Toyne	1600	0 - 1
Ian Craig	1354	1 - 0
Stephen Donkin	1428	0 - 1
Norman G Andrews	1597	½ - ½
David Wm Smith	1718	0 - 1
John Foo	1492	1 - 0
Philippe Radault	1572	0 - 1
Paul Masiak	1406	0(def) - 1

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

1423 = (10761 + 400 * (2 - 4)) / 7)