Random player works by pressing r once the gui of the game has started.
Alpha Beta player works by pressing b once the gui of the game has started.

If you have python 2.5 you might get an error with TKinter. just modify the import call from tkinter to Tkinter


Need Help on ExpectiMax.py
http://iamkush.me/an-artificial-intelligence-for-the-2048-game/
that's my source for the pseudo code.