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XTIC(1) 		     General Commands Manual			 XTIC(1)

NAME
     xtic - X version of a simple but tricky board game

RULES
     The board is made up of 4x4 squares and 16 pieces. The pieces carry 4 prop-
     erties each, namely:

     o Black or brown

     o Horizontal or vertical

     o Solid or hollow

     o Round or square

     This makes a total of 16 possible pieces and there are exactly one piece of
     each  type  (so  each piece can be represented by a binary number of length
     4).

     Initially, the board is empty and it is successively  filled  with  pieces.
     The  game is over when a row, a column or a diagonal has four pieces carry-
     ing a common property in it, e.g. four black pieces. The player who  places
     the fatal piece loses.

     The  game	is  a two-player game, although in the current release, only the
     human-computer combination is supported.  Player 1 (the human  by	default)
     chooses  one  of  the  16 pieces. Player 2 (the computer by default) places
     this piece on one of the 16 squares of the board and chooses a piece out of
     the remaining 15 pieces which he gives to player 1, who places  this  piece
     on one of the remaining 15 squares on the board, etc.

     As mentioned above, the game is over when a player places a piece in such a
     way that a row, a column or a diagonal (but see below) contains four pieces
     carrying  a  common  property.   The player who places this piece loses. If
     there is no empty square left, we have a draw (yes, this can happen).

MENU COMMANDS
     There are two menus, the Actions Menu and the Options Menu.

Actions Menu
     New game - You start
	     Starts a new game of xtic, ending the  previous  one  abruptly  and
	     letting the human start.

     New game - I start
	     Identical	to  "New game - You start" except that the computer will
	     begin the next game.

     Quit    Exist from xtic.

Options Menu
     Level trivial
	     The easiest level. The computer only tries to  place  the	selected
	     piece  in	a way that it does not lose immediately, and chooses any
	     free piece to give away, i.e. it thinks only one move ahead.

     Level easy
	     The computer thinks two moves ahead.

     Level medium
	     The computer thinks three moves ahead.

     Level hard
	     The computer thinks four moves ahead.

     Level very hard
	     The computer thinks five moves ahead.

     Level don't try
	     The computer thinks six moves ahead. This can be  quite  slow  (and
	     hard).

     Game Type: normal
	     In  addition  to  the  rows and columns, the two main diagonals are
	     dangerous (can make the game end).

     Game Type: nodiags
	     Only the rows and columns are dangerous.

     Game Type: torus
	     All 8 "diagonals" are dangerous. This corresponds to playing  on  a
	     torus.

BUGS
     Probably plenty. Report any you find to mjo@math.kth.se

AUTHOR
     Mattias  Jonsson, Dept of Mathematics, Royal Institute of Technology, S-100
     44 Stockholm, Sweden.

     email: mjo@math.kth.se, URL: http://www.math.kth.se/~mjo

Mattias Jonsson, KTH		       X11				 XTIC(1)

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