Labs

Rock-paper-scissors

If you are predictable, someone can exploit you. A random mix cannot be beaten.

5 minutes · trains Be unpredictable · points only, never money

Rock beats scissors, scissors beats paper, paper beats rock. The bot starts by throwing at random, and watches what you throw. Try to beat it over 30 rounds, and see how quickly it learns your habits.

Round
0 of 30
You won
0
Bot won
0
Draws
0

Choose your first throw.

The last 10 rounds
You
Bot

Try it yourself

In rock-paper-scissors, you often follow rock with paper. You have just thrown rock. What does a watchful opponent throw next?

3 questions, a minute or two. Nothing to finish first.

Want more? Practise Be unpredictable.

Read more

  • Mixed strategy Choosing between options with set probabilities, so the other side cannot predict and exploit you.
  • Be unpredictable If the other side can predict you, they can exploit you. Sometimes the best plan is to vary.
  • Zero-sum game A game where one player's gain is exactly the other's loss, like chess.
  • The Be unpredictable course Lessons and practice for the skill this lab trains.