Event: Durham League Division B

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Opponent	Rating	Result
Chris Clynes	1608	½ - ½
Nicholas Webb	1888	0 - 1
John Reddington	1543	1 - 0
Daniel Williams	1602	½ - ½
Oliver Belcher	1359	1 - 0
Haran Subrahmaniyam	0	1 - 0
Stephen Carter	1737	1 - 0

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

1562 = (9737 + 400 * (4 - 1)) / 7)