You would have done your money - the favourite won. Dutching all except favourite on Betfair seems pointless - why not just "lay" the favourite if you think it wont win? Personally I can't see the point of dutch betting multiple runners in most cases - you usually end up with "odds-on" returns but generally a lower winning chance than if you just backed real odds-on chances. But thats just personal preference I guess.

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"Computers can do that????" - Homer Simpson