Let's Play!

Score to win:

Your Choice 0

Result

Computer Choice 0

Rules

A zero-sum game without precise information makes up Rock-Paper-Scissors.

Two players display one of three symbols at the same time.
A rock crushes scissors, scissors cuts paper, and paper covers rock.

Source: Sacha Jerrems, via dribble

Credit: Enzoklop, CC BY-SA 3.0, via Wikimedia Commons

Gameplay

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Not a game of luck

From the World RPS Society:

Contrary to what you might think RPS is not simply a game of luck or chance. While it is true that from a mathematical perspective the 'optimum' strategy is to play randomly, it still is not a winning strategy for two reasons. First, 'optimum' in this case means you should win, lose and draw an equal number of times (hardly a winning strategy over the long term). Second, Humans, try as they might, are terrible at trying to be random, in fact often humans in trying to approximate randomness become quite predictable. So knowing that there is always something motivating your opponent's actions, there are a couple of tricks and techniques that you can use to tip the balance in your favour. — World RPS Society

Nash Equilibria

John Nash, a mathematician, established in 1950 that in every game with a finite number of players and a limited number of alternatives, such as Rock-Paper-Scissors, a mix of tactics always exists, and no single person can improve their own strategy by altering it alone. This theory earned Nash the Nobel Prize in 1994.

Payoff Matrix: **Player 1**, **Player 2**, Scenarios for all iterations
		Player 2
		Rock	Paper	Scissors
Player 1	Rock	0	-1	1
	Paper	1	0	-1
	Scissors	-1	1	0

Tips

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Rookies use rock

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First Scisssors

Last resort Paper

Double it

Cheatsheet

Conversely, if a player loses two or more times in a row, then they will not play the same sign. Instead, they play whichever sign would have beaten the one that just allowed the other person to win. Confused? Improve your chances of winning with this cheatsheet:

“If a player wins over her opponent in one play, her probability of repeating the same action in the next play is considerably higher than her probabilities of shifting actions.” — Researchers

You Won the Last Round

You've already played rock

Now it's time to play scissors.

You've already played scissors

Now it's time to play paper.

You've already played paper

Now it's time to move on to rock.

You lost in the previous round

You've already played rock

Now it's your turn to play scissors.

You've already played scissors

Now it's time to play paper.

You've already played paper

Now it's time to move on to rock.

You lost and opponent knows the hack

You've already played rock

Now it's time to move on to paper.

You've already played scissors

Now it's time to move on to rock.

You've already played paper

Now it's time to move on to scissors.

Do not repeat yourself

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Before you begin a round, inquire about the colour of your opponent's clothes. This confuses and distracts your opponent from the game. When they're perplexed, they're more inclined to choose scissors. This strategy does not work for three-round games, but if you only play one round, you should expect to win every time. .

See it live: Lorem ipsum dolor sit amet, consectetur adipisicing. demonstrated with Odin RPS!

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If you play three rounds, you have a good chance of winning. According to arXiv, scientists conducted a study in which they played three rounds of the game with 360 different students each. They chose the option that beat them in the second round after losing in the first. If someone chooses rock and you chose paper, for example, they will most likely swap to paper.

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This is because most individuals chose what would have beaten their previous move when they are under duress. As a result, you'd use scissors to beat them the second time around. 90% of the pupils were defeated by the other player who was administering the tests. It's important to remember that these tactics don't always work; it all relies on the person's mindset. Nonetheless, these mind tricks are effective about 90% of the time. Try out these methods the next time you play roshambo to see if you can spook out your opponent.

Grace Freed

Telegraph Your Throw

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Think ahead

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Bluff to suggest

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See it live: Lorem ipsum dolor sit amet, consectetur adipisicing. demonstrated with Odin RPS!

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About

It's possible that humans invented the notion of Nash equilibrium before the concept of correlated equilibrium through chance.

A implementation of grade-school classic “rock paper scissors” for The Odin Project (TOP) web development curriculum.

“People think that the ideas that evolved earlier are the more fundamental ones,”
“Who’s to say what’s a more fundamental idea?”— Roger Myerson