Event: Lytham Club Championship

PDF Excel

Opponent	Rating	Result
Patrick N Coleman	104	1 - 0
Keith Sansom	91	1 - 0
Peter A Wilson	145	½ - ½
Paul A Evans	184	0 - 1
John G Cooper	170	0 - 1

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

139 = (694 + 400 * (2 - 2)) / 5)