Event: u1850 County Championship

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Opponent	Rating	Result
Andrew J Donnelly	1834	½ - ½
Antony C Hall	1849	0 - 1
Roger H Gordonsmith	1835	½ - ½
Stephen W Ruthen	1843	1 - 0
Antony C Hall	1849	½ - ½
Sean Burton	1823	0 - 1

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

1772 = (11033 + 400 * (1 - 2)) / 6)