# Re: [Computer-go] Alphago and solving Go

```  BTW, if anyone is wondering about the "roughly" part,
361! = 1.438 * 10^768 while L19 = 2.081681994 * 10^170.```
```
On Sun, Aug 06, 2017 at 07:14:42PM -0700, David Doshay wrote:
> Yes, that zeroth order number (the one you get to without any thinking about
> how the game’s rules affect the calculation) is outdated since early last
> year when this result gave us the exact number of legal board positions:
>
> https://tromp.github.io/go/legal.html <https://tromp.github.io/go/legal.html>
>
> So, a complete game tree for 19x19 Go would contain about 2.08 * 10^170
> unique nodes (see the paper for all 171 digits) but some number of duplicates
> of those nodes for the different paths to each legal position.
>
> In an unfortunate bit of timing, it seems that many people missed this result
> because of the Alpha Go news.
>
> Cheers,
> David G Doshay
>
> ddos...@mac.com
>
>
>
>
>
> > On 6, Aug 2017, at 3:17 PM, Gunnar Farnebäck <gun...@lysator.liu.se> wrote:
> >
> > On 08/06/2017 04:39 PM, Vincent Richard wrote:
> >> No, simply because there are way to many possibilities in the game,
> >> roughly (19x19)!
> >
> > Can we lay this particular number to rest? Not that "possibilities in the
> > game" is very well defined (what does it even mean?) but the number of
> > permutations of 19x19 points has no meaningful connection to the game of go
> > at all, not even "roughly".
> >
> > /Gunnar
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>

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--
Petr Baudis, Rossum
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If we fail, I'd rather fail really hugely.  -- Moist von Lipwig
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