>> I got 0.625 ohm by building a Ybus matrix (basically tells you the 
>> conductance between each pair of nodes) and inverting it.
>
> Right.
>
> Scott: 0.625 Ohms
> pyroman: 1.3141 Ohms
> hthall: 167294/195327 Ohms ( ~0.856 Ohms)
> phlip: 25265/33783 Ohms ( ~0.747861 Ohms)
> mu-zak: 0.77 Ohms
> EngPhys: 0.758 Ohms
> Kirby: 0.7479 Ohms
>
> So most people agree it's roughly 1 Ohm, but there's still a fair bit of 
> variation there...

OK so I should have checked my 14x14 matrix before asking Excel to invert 
it, apparently the numerical error is quite high in Excel's matrix inverse 
function (and this matrix is quite badly formulated).  Solving it with a 
Gauss solver I wrote before (probably for some random Project Euler problem) 
I get 0.7479 ohms, which is the same as Kirby.

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