Event: u1850 County Championship

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Opponent	Rating	Result
Paul Spencer	1748	0 - 1
Andrew Maclaren	1755	½ - ½
John R Wickham	1707	½ - ½
Stephen C Pride	1608	½ - ½
Francois Swiegers	1729	0 - 1
Armando Galletti	1675	1 - 0

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

1637 = (10222 + 400 * (1 - 2)) / 6)