Event: Lytham Club Championship

PDF Excel

Opponent	Rating	Result
Robert Tinton	125	0 - 1
Philip N Raynor	142	0 - 1
Yvonne S Taylor	44	1 - 0
Graham Taylor	118	0 - 1
Keith Sansom	91	½ - ½

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

-56 = (520 + 400 * (1 - 3)) / 5)