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Announcing a new Pente variant :   ninuki
Ninuki-Renju is an old Japanese variant of gomoku that was the basis for 
Pente (captures are allowed). In ninuki, double threes and double fours 
are not allowed.
challenge mmammel you ninuki
or vice versa...

Help For Ninuki

Introduction

   Welcome to the network Ninuki server. The rules of Ninuki-Renju are 
below.
   Ninuki-Renju is an old Japanese game which was the basis for Pente.
   Ninuki has some additional movement restrictions to balance the game.
   The commands are the same for all pbmserv games.
  
The Rules of Ninuki-Renju

Object of the Game

   On a 19x19 board, the two players try to be the first to create a
   "perfect" line of 5 stones in a row of their color *or* try to
   capture 5 pairs of their opponents stones. You capture a pair of
   stones any time you sandwich the stones between a pair of your stones.
  
Movement Rules

   On your turn, you place a piece of your colour wherever you desire on
   the board.
          A B C D E F G H J K L M N O P Q R S T
      19  . . . . . . . . . . . . . . . . . . .  19
      18  . . . . . . . . . . . . . . . . . . .  18
      17  . . . . . . . . . . . . . . . . . . .  17
      16  . . . . . . . . . . . . . . . . . . .  16
      15  . . . . . . . . . . . . . . . . . . .  15
      14  . . . . . . . . . . . . . . . . . . .  14
      13  . . . . . . . . . . . . . . . . . . .  13
      12  . . . . . . . . . . . . . . . . . . .  12
      11  . . . . . . . . . . . . . . . . . . .  11
      10  . . . . . . . . . . . . . . . . . . .  10
       9  . . . . . . . . . . . . . . . . . . .   9
       8  . . . . . . . . . . . . . . . . . . .   8
       7  . . . . . . . . . . . . . . . . . . .   7
       6  . . . . . . . . . . . . . . . . . . .   6
       5  . . . . . . . . . . . . . . . . . . .   5
       4  . . . . . . . . . . . . . . . . . . .   4
       3  . . . . . . . . . . . . . . . . . . .   3
       2  . . . . . . . . . . . . . . . . . . .   2
       1  . . . . . . . . . . . . . . . . . . .   1
          A B C D E F G H J K L M N O P Q R S T

              Figure 1 -- Empty Ninuki Board.
  
Capture Examples

        . . . . . .        . . . . . .
        . . . . x .        . . . . x .
        . . . o . .        . . . . . .
        . . o . . .   =>   . . . . . .
        . A o o x .        . x . . x .
        . . . . . .        . . . . . .

   An 'x' piece placed at A results in the capture of 2 pairs of Ohs men.
        . . . . . .        . . . . . .
        . . . . x .        . . . . x .
        . . . o . .        . . . o . .
        . . B . . .   =>   . . o . . .
        . x . . . .        . x . . . .
        . . . . . .        . . . . . .

   An 'o' piece placed at B does *not* result in the capture of a pair of
   Ohs men. Eks must do the "sandwich"ing to capture the Ohs men.

Opening Rules:
   The first move of the game (by Eks) is automatically made to the 
center K10.
   The second move, made by Ohs, must be adjacent to the center move, 
that is restricted to [J-L][9-11].
   The third move (Eks) must *not* be within 2 spaces of the piece at 
K10, that is OUTSIDE of [H-M][8-12].
  
Additional movement rules:

   If a five is made and after that the opponent captures and destroys
   the five there is no win. This is called an "unperfect 5". The 
destroying
   of the unperfect five must be made with the move immediately following
   the five.

   Neither player is allowed to form a double-three, unless the move 
also makes a five,
   or it is necessary to do so when destroying an "unperfect 5" or 
blocking an opponent's four.


  14  - - - - - - - - - - - - - - - - - - - 
  13  - - - - - - - - - - - - - - - - - - - 
  12  - - - - - - - - - - - o - - - - - - - 
  11  - - - - - - - - x - x o o - - - - - - 
  10  - - - - - - x o o o o O - - - - - - - 
   9  - - - - - - - - - - o - - - - - - - -  
   8  - - - - - - - - - - - - - - - - - - -  
   7  - - - - - - - - - - - - - - - - - - -  

  5-3-3 is allowed.

  Forming a double three while blocking or capturing a four or
  unperfect five is forbidden if there are other allowed defenses.
    14  - - - - - - - - - - - - - - - - - - - 
  13  - - - - - - - - - - - - - - - - - - - 
  12  - - - - - - - - - - - - - - - - - - - 
  11  - - - - - - - - x - - - - - - - - - - 
  10  - - - - - - x o o o o 1 - - - - - - - 
   9  - - - - - - - - - - o - - - - - - - -  
   8  - - - - - - - - - - o X - - - - - - -  
   7  - - - - - - - - - - - - - - - - - - -  
   6  - - - - - - - - - x - x - - - - - - -  
   5  - - - - - - - - x - - x - - - - - - -  
   4  - - - - - - - - - - - - - - - - - - -
 
  X is prohibited because 1 defends the four without forming a 3-3.


    14  - - - - - - - - - - - - - - - - - - - 
  13  - - - - - - x - - x - - - - - - - - - 
  12  - - - - - - x - x - 1 - - - - - - - - 
  11  - - - - - - - - - - o - - - - - - - - 
  10  - - - - - - X o o o o x - - - - - - - 
   9  - - - - - - - - - - x - - - - - - - - 
   8  - - - - - - - - - - - - - - - - - - -

   X is prohibited because 1 is allowed.

   An "overline" (six or more stones in a row) does not win and remains 
neutral.

   A rare case occurs when a fifth capture gives the opponent a five.
   This occurs when one stone is captured away from a 6-in-a-row,
   leaving 5. In this case, the game is draw.

References
   http://renju.nu/r1rulhis2.htm

Implementation: by jeanp-a