Event: SCCA Division 1

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Opponent	Rating	Result
Piotr Dolewka	1546	½ - ½
Angus Irving	1750	0 - 1
Graeme Jones	1788	0 - 1
Mark A Pulman	1623	½ - ½
Robert W Stephens	1775	½ - ½
Angus Irving	1750	0 - 1
Laurie Pott	0	0 - 1

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

1233 = (10232 + 400 * (0 - 4)) / 7)