You can play a few games first and try to guess how the computer thinks.
I wrote a strategy for the computer based on research on this game (you can search for articles). There are three cases:
- The computer loses. He uses a "win-stay, lose-shift" strategy. So he changes his play, to the one that will win, to which he failed. Because usually people don't change their actions if they win.
- The computer won. The same "win-stay, lose-shift" strategy, but a bit more complicated. The computer will choose the action that will win the player's action if player plays the "win-stay, lose-shift" strategy. x_x
- Draw. Most people prefer rock. Therefore, the computer will choose paper. :D
P.s. and it can play completely randomly if you want it to.