Event: BCL Division 2

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Opponent	Rating	Result
James Grimditch	1536	0 - 1
John McNamara	1587	½ - ½
Humayun Mirza	1534	0 - 1
George Griffiths	1456	½ - ½
John E McKeon	1589	0 - 1
Damanjeet Singh	1945	0 - 1
Daven Patel	1493	1 - 0

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

1420 = (11140 + 400 * (1 - 4)) / 7)