There practically isn't a way to beat the computer... since it scores 40 each time it wins and you only score 20. Stupid really it should be the same for both players.
Unless you are really really good then you won't beat it. My current high score is 273
Hellbread, Hellsibad, Hellbird, Hellbead, Hellisbad, Hellibred
Just a few of the ways of talking to our fellow poster Hellbeard!