Event: Burton one-hour tournament

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Opponent	Rating	Result
Trevor C Bould	0	0 - 1
Piotr Natoniewski	1438
Graeme Drayton	1316	1 - 0
David J Pickering	1735
Vinod M Fernando	1919
Ryan L. Smith	0
Nigel Beard	1550
Roger Bird	0
Edmund M. Jones	0
Joe Parker	1469

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

658 = (1316 + 400 * (1 - 1)) / 2)