## May 03, 2014

### Science marches on

Science Has Finally Figured Out How to Win Rock-Paper-Scissors

Turns out that all you rock-paper-scissors champions who chalk it up to skill over luck may be on to something. Because according to science, there might actually be a winning strategy to this greatest of metacarpal match-ups.

The bold claim comes from a collective of Chinese researchers who recently took 360 students, broke them into groups of six, and had them play 300 rounds of the game in random pairings. To make sure players never lost incentive (which would be understandable after round 30, much less 300), the winners of each round were given a small sum of money as a reward.

So what do you need to know to win? After observing the many, many rounds, the scientists found that "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."

On the other hand, if a player loses two or more times in a row, he or she will not play the same sign, but will instead play whichever sign would have beaten the one that had just allowed his or her opponent to win. So if Player A has been on a losing streak, and Player B just threw down scissors to beat A's paper, B will likely throw down a rock, which stands a good chance of winning since A is likely to stick with his previously won hand anyway. This is called the "win-stay, lose-shift" strategy.

Posted by joke du jour at May 3, 2014 11:02 PM

http://crainium.net/ajw-mt/mt-tb.fcgi/8565

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