Benedikt Huber wrote:

> This is impossible for players which do not cheat.
> You can't give any predictions on the next move of a random player.
> Therefore you have a 1/3 prop. to choose a winning,losing or drawing move.
> 
> Here is another 'cheater' (which does not redefine a method):

This is similar to my solution, but mine does also copy the state of its 
enemy.