Event: Derby & District Division 1

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Opponent	Rating	Result
Simon N Gilmore	2067	½ - ½
Kieran Redhead	1642	½ - ½
Andrew Robins	1791	0 - 1
Andrew Toothill	1910	½ - ½
Ranjit Nath	1743	½ - ½
Kevin J Dalley	1845	1 - 0
Michael J Alderson	1973	1 - 0

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

1910 = (12971 + 400 * (2 - 1)) / 7)