On Fri, 22 Jan 2016, Adrian Petrescu wrote:

Very cool! I find it interesting that the number is only about 1.2% of 3^361 
(though I realize 3^361 doesn't take symmetries into account).
On the surface it's counterintuitive to me that nearly 99% of random stone 
configurations are not legal Go positions!

The chance to violate the rule somewhere goes linearly with the area, so
quadratically with the size of the board.


On Fri, Jan 22, 2016 at 10:50 AM, Xavier Combelle <xavier.combe...@gmail.com> 
wrote:
      well done !

2016-01-22 5:18 GMT+01:00 John Tromp <john.tr...@gmail.com>:
      It's been a long journey, and now it's finally complete!

      http://tromp.github.io/go/legal.html

      has all the juicy details...

      regards,
      -John
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