Event: Combined Banks and Insurance Chess League 2008-09

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Opponent	Rating	Result
Imran Ahmad	0	0 - 1
Martin D Leanse	0	1 - 0
John S Shaw	0	0 - 1
Geoff W Naldrett	0	½ - ½

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

-100 = (0 + 400 * (1 - 2)) / 4)