Event: Combined Banks and Insurance Chess League 2004-05

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Opponent	Rating	Result
David A Tidmarsh	0	0 - 1
Brendan Keenan	0	0 - 1
David MP Burford	0	0 - 1
Gary Callan	0	0 - 1

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

-400 = (0 + 400 * (0 - 4)) / 4)