Event: Lytham Club Championship

PDF Excel

Opponent	Rating	Result
Paul A Evans	181	0 - 1
Dennis Davies	109	0 - 1
Graham Taylor	118	1 - 0
Colin Wilks	102	0 - 1
Yvonne S Taylor	44	1 - 0

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

31 = (554 + 400 * (2 - 3)) / 5)