Event: Macclesfield Individual Championship

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Opponent	Rating	Result
Martin R Olsson	156	½ - ½
John Paul J Taylor	155	1 - 0
Philip J Colville	153	½ - ½
Carl Gartside	153	½ - ½
Geoff Laurence	146	½ - ½
Geoff Laurence	146	½ - ½
James P Heppell	177	0 - 1

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

155 = (1086 + 400 * (1 - 1)) / 7)