Event: B&DCL Div 4

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Opponent	Rating	Result
Mike Rutter	1665	½ - ½
Chris Spence	1468	0 - 1
Ken Dixon	1477	0 - 1
Tony Sanderson	1591	0 - 1
Simon Errington	1550	0 - 1
John R Bowley	1599	0 - 1

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

1225 = (9350 + 400 * (0 - 5)) / 6)