Event: u1850 County Championship

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Opponent	Rating	Result
Richard McMorran	1688	½ - ½
Colin A Roberts	1755	0 - 1
Ed Kirkham	1741	½ - ½
Nimish Shah	0	1 - 0

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

1296 = (5184 + 400 * (1 - 1)) / 4)