Event: u1850 County Championship

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Opponent	Rating	Result
Tom Gordon	1691	1 - 0
Hazel Bowler	1809	½ - ½
Cameron J Little	1804	0 - 1
Laurie Pott	1805	0 - 1

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

1677 = (7109 + 400 * (1 - 2)) / 4)