Event: u1850 County Championship

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Opponent	Rating	Result
Andrew Maclaren	1818	½ - ½
David E McLean	1791	½ - ½
Francis J Bowers	1843	1 - 0
Michelle Ngo Yu Chan	1822	0 - 1
David E McLean	1791	½ - ½
Peter Barkas	1788	1 - 0

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

1876 = (10853 + 400 * (2 - 1)) / 6)