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Rock-paper-scissors-lizard-Spock is an expansion of the classic selection method game rock-paper-scissors. It operates on the same basic principle, but includes two additional weapons: the lizard (formed by the hand as a sock-puppet-like mouth) and Spock (formed by the Star Trek Vulcan salute). This reduces the chances of a round ending in a tie (from 1/3 to 1/5). The game was invented by Sam Kass with Karen Bryla, as "Rock Paper Scissors Spock Lizard".[non-primary source needed]
The game was mentioned in four episodes of The Big Bang Theory. According to an interview with Kass, the series producers did not ask for permission to use the game, but he was later referenced in the episode "The Rothman Disintegration" from the fifth season, for which he thanked them on his website.[self-published source?]
Each player picks a hand-shape, then all players reveal their choices at the same time. The winner is the one who defeats the others. The rules of rock-paper-scissors-lizard-Spock are:
- Scissors cut Paper
- Paper covers Rock
- Rock crushes Lizard
- Lizard poisons Spock
- Spock smashes Scissors
- Scissors decapitate Lizard
- Lizard eats Paper
- Paper disproves Spock
- Spock vaporizes Rock
- Rock crushes Scissors
There are fifteen possible pairings of the five gestures (including ties). Each gesture beats two of the other gestures and is beaten by the remaining two. In a tie, the process is repeated until a winner is found. The original rules (rock beats scissors, scissors beats paper, paper beats rock) remain the same.
Guinness Book of World Records
The current Guinness world record for largest tournament of rock-paper-scissors was completed using rock-paper-scissors-lizard-Spock. The tournament contained 2,950 participants and was achieved by Oomba, Inc. (USA) at Gen Con 2014 in Indianapolis, Indiana, USA, on 17 August 2014.
- "... and paper scissors". The Times. June 11, 2005. Archived from the original on May 31, 2010. Retrieved 2010-11-04.
- "Rock Paper Scissors Spock Lizard". Sam Kass. Retrieved 2010-11-04.
- "The True Story behind RPS, Lizard, Spock". Archived from the original on May 19, 2012. Retrieved January 10, 2014.
- "OOMBA SOFTWARE HELPS GEN CON ATTENDEES BREAK LARGEST ROCK, PAPER, SCISSORS TOURNAMENT RECORD". http://www.guinnessworldrecords.com/. Retrieved 7 October 2014.