Event: Div1

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Opponent	Rating	Result
John E Shannon	182	½ - ½
Mike Alcock	173	½ - ½
Steven J Burke	175	0 - 1
Paul Madden	195	½ - ½
Peter M Collins	160	½ - ½
Alan F Downham	172	½ - ½
James R Shore	138	½ - ½
Mike Alcock	168	½ - ½
Gary Haime	152	1 - 0
Alan F Downham	168	1 - 0
John S Shaw	133	1 - 0
Geoffrey D Brown	151	0 - 1

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

197 = (1967 + 400 * (3 - 2)) / 12)