Event: Burton one-hour tournament

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Opponent	Rating	Result
Vinod M Fernando	0	0 - 1
Piotr Natoniewski	1438
Nigel Beard	1550	1 - 0
David J Pickering	1735
Ryan L. Smith	0
Joe Parker	1469
Roger Bird	0
Anushka M. Ramawickrama	0
Trevor C Bould	0
Graeme Drayton	1316

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

775 = (1550 + 400 * (1 - 1)) / 2)