Event: D&DCL Div 2

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Opponent	Rating	Result
Chris A Fraser	1539	0 - 1
Paul Kelman	1603	0 - 1
Paul Kelman	1592	½ - ½
Matthew Caswell	1631	0 - 1
John S Shaw	1777	0 - 1
John S Shaw	1751	0 - 1
Garry Sands	1559	1 - 0
Mike P Maher	1627	½ - ½

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

1435 = (13079 + 400 * (1 - 5)) / 8)