Event: Div2

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Opponent	Rating	Result
Kevin J Dalley	163	1 - 0
Jonah B Willow	200	0 - 1
Mike Allen	122	1 - 0
Antony M Allen	143	1 - 0
Philip Sheldon	139	½ - ½
Kevin J Gallagher	126	1 - 0
Graham J Pace	119	1 - 0
David Hoddy	141	1 - 0
Jaime Castro	157	0 - 1
Robert H Willoughby	126	½ - ½
John D Hoddy	140	½ - ½
Andre Cockburn	105	1 - 0

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

307 = (1681 + 400 * (7 - 2)) / 12)