Event: DCL Div 2

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Opponent	Rating	Result
Nicholas B Stout	133	1 - 0
Steve Blake	131	0 - 1
Stephen M Pollyn	140	0 - 1
Robert Halse	145	½ - ½
Chris JP Leeson	143	0 - 1
Julian C Cherryson	138	1 - 0
Julian C Cherryson	138	½ - ½

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

81 = (968 + 400 * (2 - 3)) / 7)