[pbmserv] Re: ninuki rules

[<msmammel@starpower.net>]

The move shown in your example was legal because the stone
placed was not part of both threes, it revealed one of the
threes by capturing a blocking stone of an existing three.

Additional description of the rules not seen in all help files:

A move that forms a 3-3 due to capturing is not allowed, but a
capturing move that reveals a 3-3 is allowed.

forms 3-3  (forbidden)
  14  - - - - - - - - - - - - - - - - - - -  
  13  - - - - - - x - - x - - - - - - - - -  
  12  - - - - - - x - x - - - - - - - - - -  
  11  - - - - - - - - - - - - - - - - - - -        
  10  - - - - - - X - - - - - - - - - - - -  
   9  - - - - - o o - - - - - - - - - - - -  
   8  - - - - o - o - - - - - - - - - - - -  
   7  - - - x - - x - - - - - - - - - - - -  
   6  - - - - - - - - - - - - - - - - - - -  

not part of the 3-3 (allowed)
  14  - - - - - - - - - - - - - - - - - - -  
  13  - - - - - - x - - x - - - - - - - - -  
  12  - - - - - - x - x - - - - - - - - - -        
  11  - - - - - - - - - - - - - - - - - - -  
  10  - - - - - - x - - - - - - - - - - - -  
   9  - - - - X o o x - - - - - - - - - - -  
   8  - - - - - - - - - - - - - - - - - - -