Event: York Club Championship

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Opponent	Rating	Result
Stephen Donkin	0	1 - 0
Paul A Johnson	1911	½ - ½
Norman G Andrews	1602	1 - 0
Ewen Miller	1798	0 - 1
Jack Howorth	1647	0 - 1
Adam Ismail	1913	0 - 1
Ian Craig	1424	1 - 0
Derek Toyne	1595	1 - 0

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

1536 = (11890 + 400 * (4 - 3)) / 8)