When playing
3D tic-tac-toe it is possible for the person going first to always
win, simply by choosing the centre square as their first move. This is a
radical departure from traditional
two dimensional tic-tac-toe, where the game can always be brought to a draw but can never be won.
This can be easily proved with a simple mathematical proof - something that is very easy to show with
pen and paper but rather more difficult to do with
ASCII art.