Event: Lytham Club Championship

PDF Excel

Opponent	Rating	Result
David E Aspinall	140	½ - ½
John Regan	104	½ - ½
Marvin Carbin	121	1 - 0
Patrick N Coleman	104	0 - 1
Paul A Evans	184	0 - 1

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

51 = (653 + 400 * (1 - 2)) / 5)