Event: u1850 County Championship

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Opponent	Rating	Result
Colin R Payne	1657	1 - 0
John WF McAllister	1718	1 - 0
Alan PH Norman	1664	1 - 0
Armando Galletti	1675	1 - 0
Andrew J Donnelly	1834	0 - 1
Declan Rice	1747	½ - ½

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

1916 = (10295 + 400 * (4 - 1)) / 6)