; XTIC112, GAMES, X version of a simple but tricky board game      RULES   A     The board is made up of 4x4 squares and 16 pieces. The pieces $     carry 4 properties each, namely:          o Black or brown         o Horizontal or vertical         o Solid or hollow        o Round or square  B     This makes a total of 16 possible pieces and there are exactly?     one piece of each type (so each piece can be represented by !     a binary number of length 4).   D     Initially, the board is empty and it is successively filled with?     pieces. The game is over when a row, a column or a diagonal ?     has four pieces carrying a common property in it, e.g. four >     black pieces. The player who places the fatal piece loses.  C     The game is a two-player game, although in the current release, 5     only the human-computer combination is supported. J     Player 1 (the human by default) chooses one of the 16 pieces. Player 2@     (the computer by default) places this piece on one of the 16A     squares of the board and chooses a piece out of the remaining :      15 pieces which he gives to player 1, who places this@      piece on one of the remaining 15 squares on the board, etc.  ?     As mentioned above, the game is over when a player places a :     piece in such a way that a row, a column or a diagonalD     (but see below) contains four pieces carrying a common property.G     The player who places this piece loses. If there is no empty square 0     left, we have a draw (yes, this can happen).     AUTHOR       Mattias Jonsson,     Dept of Mathematics,"     Royal Institute of Technology,     S-100 44 Stockholm,      Sweden.        email: mjo@math.kth.se, $     URL: http://www.math.kth.se/~mjo    