Event: Burton one-hour tournament

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Opponent	Rating	Result
Piotr Natoniewski	1438
Roger Bird	0
Vinod M Fernando	2038
Ryan L. Smith	1868
Nigel Beard	1530
David J Pickering	1735
Trevor C Bould	1998
Edmund M. Jones	1756
Anushka M. Ramawickrama	1679

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

0 = (0 + 400 * (0 - 0)) / 0)