Event: Chessmaster Challenge 80/10

PDF Excel

Opponent	Rating	Result
Paul Rutter	1405	0 - 1
Shaun Betts	0	0 - 1
Roger Clarke	0	0 - 1
Tony Gill	0	0 - 1
Keith May	1002	0 - 1

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

81 = (2407 + 400 * (0 - 5)) / 5)