This is a game historycal source taken from http://web.archive.org/web/20050212180221/http://www.vis.inf.ethz.ch/~andy/Oberon.html

It serves as an example of XYplane module usage.

build by typing:

make

run by ./Vier <number>

Start Vier gewinnt with Vier.HitMe a~
       a Points to quit the program

   During the game, the following keys are availiable:

 Player One:
         q ... move left
         w ... move right
         a ... mark field
 Player Two:
         o ... move left
         p ... move right
         l ... mark field
 General keys:
         h ... abort

