Rock Paper Scissors

Officially Rock, Paper, Scissors (Jan-ken in Japan; Jankenpon; Roshambo)

World's most-played hand game — 2+ players simultaneously make 1 of 3 hand shapes (Rock, Paper, or Scissors). Rock crushes Scissors; Scissors cuts Paper; Paper covers Rock. Origins in ancient China (~200 BC 'shoushiling'); modernized Japan Edo era (jan-ken); global dispute-resolution tool. World RPS Society championships since 2002; $10K+ prizes.

📐N/A — hand game⏱~1 min🌤indoor

What is Rock Paper Scissors?

Rock Paper Scissors (RPS) is a HAND GAME dating to ancient China ~200 BC (called 'shoushiling' 手勢令). Modern 3-symbol form (rock, paper, scissors) developed in JAPAN during EDO period (1600-1868) as 'JAN-KEN' or 'JANKENPON.' Introduced to WEST early 20th century (1927 first English rulebook). NOW UNIVERSAL as decision-making tool across cultures — dispute resolution, order-of-play determination, casual competition. GAMEPLAY: 2+ players simultaneously make 1 of 3 hand shapes: (1) ROCK — closed fist. (2) PAPER — flat palm. (3) SCISSORS — 2 fingers extended in V shape. Players count '1, 2, 3, shoot' or 'ro-sham-bo' or 'jan-ken-pon' and reveal shape simultaneously. WINNER DETERMINED: (1) ROCK crushes SCISSORS. (2) SCISSORS cuts PAPER. (3) PAPER covers ROCK. Same shape = TIE (redo). Cyclic dominance = no dominant strategy = theoretically balanced. STRATEGY: research shows subconscious patterns — first-move rock most common by men (55%), first-move paper by women (39%). Losers tend to switch symbols; winners tend to repeat. Advanced RPS players read these patterns. VARIANTS: (1) BEST OF 3/5/7 — extended matches. (2) ROCK-PAPER-SCISSORS-LIZARD-SPOCK (Sam Kass 1998 + Big Bang Theory popularity) — 5 hand shapes; 20% chance of tie vs 33% classic. (3) BIG NUMBER (Japanese) — 3-player variant. (4) PRINCE-PRINCESS-DRAGON — 5-move variant. (5) JAN-KEN-PON JAPANESE original with different hand shapes. WORLD CHAMPIONSHIPS: WORLD RPS SOCIETY (WRPS) organizes annual World Championship since 2002 in Toronto/Ottawa (Canadian founders); $10K+ prizes; hundreds of competitors. USA Rock Paper Scissors League (USARPS) partnered with Bud Light for televised events 2006-2007. COMPUTER OPTIMAL: In theory, playing each shape with EQUAL 1/3 PROBABILITY is UNBEATABLE (Nash Equilibrium). In practice, humans have subconscious patterns exploitable by AI + expert players. CULTURAL: Universal dispute-resolution tool (who pays check, who gets last piece of pizza, first swing at bat). Used in Olympic-related decisions, business negotiations, courtroom rulings (Federal Judge Presnell Florida 2006 ordered RPS to settle deposition dispute).

Quick facts

How it works

Objective

Beat opponent by making hand shape that dominates their shape (Rock > Scissors > Paper > Rock).

Match structure

Single game or best-of-N (usually best of 3, 5, 7). World Championships: elimination brackets with best-of-3 matches.

Rules

Basic rules

3 hand shapes: Rock, Paper, Scissors
ROCK = closed fist. PAPER = flat palm (fingers together). SCISSORS = index + middle fingers extended in V.
Simultaneous reveal on count
Count '1, 2, 3, shoot' or 'ro-sham-bo' or 'rock, paper, scissors, shoot' — both players reveal shape ON 'shoot' (or 4th count).
Rock crushes Scissors
Rock (fist) crushes/breaks Scissors (V-shaped fingers). Rock wins.
Scissors cuts Paper
Scissors (V-shaped fingers) cuts Paper (flat palm). Scissors wins.
Paper covers Rock
Paper (flat palm) covers/wraps Rock (fist). Paper wins.
Same shape = tie, redo
Both players showing same shape = TIE. Play again immediately.
Best-of-N for match
Single throw or best-of-3, best-of-5, best-of-7 for longer matches. First to majority wins.

Advanced rules

Rock-Paper-Scissors-Lizard-Spock variant
Sam Kass 1998 (later popularized by Big Bang Theory) added Lizard + Spock. RULES: Rock crushes Scissors, Scissors cut Paper, Paper covers Rock, Rock crushes Lizard, Lizard poisons Spock, Spock smashes Scissors, Scissors decapitates Lizard, Lizard eats Paper, Paper disproves Spock, Spock vaporizes Rock. TIE only when SAME hand (20% vs 33% classic).
Rock-Paper-Scissors-Lizard-Spock-etc. mega variants
5, 7, 15, 25, 101-hand variants exist. Complexity increases; tie probability decreases. Only 3-5 practical for casual play.
Nash Equilibrium strategy
Playing each of 3 shapes with EQUAL 1/3 PROBABILITY is theoretically UNBEATABLE (Nash Equilibrium). In practice, humans have subconscious patterns exploitable.
Human tendency exploitation
STATISTICAL RESEARCH: (1) First move by men: 55% ROCK. (2) First move by women: 39% PAPER. (3) LOSERS often SWITCH symbols; WINNERS often REPEAT. (4) SEQUENCES like 'rock, rock, rock' become less common as players avoid repetition.
'Fair' introduction
First round often 'fair' (random) as opponents haven't established patterns. Beyond round 1, exploit patterns.
Tournament rule sets
WORLD RPS SOCIETY rules: (1) Best-of-3, best-of-5, or single-shot. (2) Simultaneous reveal on 4th count (some variants on 3rd). (3) Match-play with brackets. (4) Judges for disputes.
Team RPS (mass tournament format)
20-100+ players in single game: winners advance, losers eliminated. Massive fun bracket for parties + team-building.
Sequence strategies
Advanced players plan 3-5 move sequences: 'rock, paper, scissors' or 'rock, rock, paper' etc. Counter opponent's likely patterns.
Bluffing + tell reading
Some 'RPS pros' claim to read opponents' pre-throw tells (breathing, muscle tension). Anecdotal — no scientific backing.
Robots / AI usually beat humans
AI + robots exploiting human patterns can win 60-70% of RPS matches. Human vs random computer = 50-50 (perfectly random). Human patterns are exploitable.

Scoring

Win/loss per throw; best-of-N determines match. World Championships have full elimination brackets.

Action	Points
Win single throw	1 win
Win best-of-3 match	2 wins required (1 match win)
Win best-of-5 match	3 wins required (1 match win)
Advance elimination bracket	1 round advancement
World Championship title	$10-15K + WRPS trophy
USARPS Championship (defunct 2006-2007)	$50K + Bud Light sponsorship + trophy

Win condition · Beat opponent by making hand shape that dominates their shape; best of N throws determines match winner.

Playing area

Called

N/A — hand game

Dimensions

N/A — played face-to-face; no equipment.

No playing field required. Just two hands and space to make gestures.

Equipment

Hands (yours + opponent's)
No physical equipment needed. Total cost: $0.
Optional: coin flip alternative
For those who don't want to gesture — RPS often substitutes for coin flip.
Optional: RPS apps + simulators
Mobile apps + websites (rpsplay.com, rockpaperscissors.io) for solo/online play.

Officiating

World RPS Society sets official rules for tournaments. Casual play requires no officiating. Disputes typically resolved by re-throw or informal consensus.

No formal officiating for casual play
Head Judge + Floor Judges at World Championships
Tournament Director for large events

Strategies

Play random (Nash Equilibrium)
In theory, 1/3 probability each shape is UNBEATABLE. Humans can't truly randomize; try random.org or dice roll for perfect randomness.
First-move statistics
Men throw ROCK first 55% of time; women throw PAPER first 39% of time. Adjust accordingly for opening move.
Losers switch, winners repeat
Player who just LOST tends to SWITCH symbols. Player who just WON tends to REPEAT. Counter accordingly.
Avoid triple-repeats
Humans dislike playing same symbol 3+ times in a row. If opponent just played rock-rock, they're unlikely to play rock again.
Meta-thinking levels
LEVEL 1: What will opponent throw? LEVEL 2: What will opponent think I'll throw? LEVEL 3: What will opponent think I think they'll think? Adjust depth to opponent.
Verbal cues + bluffing
Some pros announce intentions ('I'm throwing rock') hoping opponent doesn't believe them. Double-bluff mind games.
Watch opponent's hand pre-throw
Some tells: rock = pre-throw fist tension; scissors = pre-throw finger extension. Anecdotal but claimed by pros.
Best-of-N strategy
In best-of-3, first throw more random; adjust based on opponent's responses. Longer matches allow more pattern exploitation.
Practice with AI apps
rockpaperscissors.io + similar apps track your patterns + play optimally. Learn your own tendencies.
For dispute resolution: keep casual
In real-world use (deciding who pays check), don't overthink. Random throw usually sufficient.
Learn RPSLS if playing casually with fans
Rock-Paper-Scissors-Lizard-Spock popular among Big Bang Theory fans; adds novelty + reduces ties.
Tournament etiquette
In WRPS events: firm handshake before match, clear count-off cadence, no premature throws, accept judge rulings.

Terminology

Rock (fist): Closed fist; beats Scissors; loses to Paper.
Paper (flat palm): Flat hand with fingers together; beats Rock; loses to Scissors.
Scissors (2 fingers V): Index + middle fingers extended in V shape; beats Paper; loses to Rock.
Roshambo / Ro-Sham-Bo: English name for RPS (origin uncertain; possibly named after Comte de Rochambeau, French general who aided American Revolution).
Jan-Ken / Jan-Ken-Pon: Japanese name for RPS; 'jan' = signal, 'ken' = fist, 'pon' = throw.
Kai Bai Bo: Korean name for RPS; different traditional hand symbols.
Shoushiling: Ancient Chinese ancestor game ~200 BC; original hand game.
Cyclic dominance: Rock > Scissors > Paper > Rock; each beats one + loses to one (no dominant strategy).
Nash Equilibrium: Optimal randomized strategy (1/3 each shape) that opponents can't exploit.
Tie / Draw: Both players throwing same shape; play again immediately.
Best of 3 / 5 / 7: Match to N wins; first to majority (2 of 3, 3 of 5, 4 of 7) wins match.
Simultaneous reveal: Both players reveal hand shape at same time; prevents peeking + reacting.
Count-off: '1, 2, 3, shoot' or 'ro-sham-bo' or 'jan-ken-pon'; reveal on last count.
Sequence: Series of throws (3-5 moves) planned in advance.
Meta-thinking: Levels of thinking: 'what will they throw?' → 'what will they think I'll throw?' → deeper.
First-move statistics: Men 55% Rock; women 39% Paper; use for opening throws.
Winner-stays / Loser-switches: Human tendency: winners repeat symbols, losers switch. Exploitable pattern.
Bluffing: Announcing intended throw hoping opponent doesn't believe.
Tell: Physical indicator (pre-throw hand position) that reveals opponent's intended throw.
Rock-Paper-Scissors-Lizard-Spock (RPSLS): 5-hand variant by Sam Kass (1998); popularized by Big Bang Theory 2008.
WRPS (World Rock Paper Scissors Society): Global governing body; founded 1918 London; refounded Toronto 1996.
USARPS: USA Rock Paper Scissors League (Bud Light 2006-2007).
Judge / Referee: Tournament official resolving disputes about hand shapes + timing.
Bracket: Elimination tournament structure; single/double elimination.
Random / Randomization: Playing with equal probability of each shape (Nash equilibrium).
Pattern exploitation: Exploiting opponent's subconscious patterns (opposite of random).

Major competitions

World Rock Paper Scissors Championships (WRPS)
annual · Toronto/Ottawa, Canada (rotating) · since 2002
USA Rock Paper Scissors League Championship
defunct (2006-2007) · USA (Bud Light-sponsored; televised on A&E) · since 2006
UK Rock Paper Scissors Championships
occasional · UK · since 2003
Japanese Jan-Ken Championships
informal + occasional · Japan · since 1950
Local + charity RPS tournaments
ongoing · worldwide (bars, festivals, corporate events) · since 1990
AI vs Human RPS competitions
occasional research events · worldwide (research + gaming) · since 2010

Governing bodies

World Rock Paper Scissors Society (WRPS)
Founded 1918 · Toronto, Canada (originally London; moved 1996)
Official site ↗
USA Rock Paper Scissors League (USARPS)
Founded 2006 · USA (Bud Light-sponsored 2006-2007; largely inactive since)
UK Rock Paper Scissors Association
Founded 2003 · UK
Japanese Jan-Ken Association
Founded 1900 · Japan (informal)

Famous names & records

Famous athletes

Peter Lovering (Canada) — 2006 World RPS Champion
Tim Conrad (USA) — 2003 World RPS Champion; sponsored Bud Light USA champion
Bob Cooper (Canada) — 2002 first-ever World RPS Champion
Sean 'Wicked Fingers' Sears (USA) — 2008 World Champion
Robert Lanka (USA) — 2007 USARPS $50K Champion (Bud Light final)
Andrea Farina (Italy) — 2004 World Champion; first European winner
Douglas + Graham Walker (Canada) — WRPS Society co-founders + rule-makers
Sam Kass (USA) — Inventor of Rock-Paper-Scissors-Lizard-Spock 1998; former White House chef under Obama
David Bilbo Baggins (competitor pseudonym) — Multiple WRPS Championship top-8
Karen Bryla (USA) — Female WRPS champion + advocate
Sheldon Cooper (fictional, Big Bang Theory) — Popularized Rock-Paper-Scissors-Lizard-Spock in mainstream culture

Records

Ancient Chinese shoushiling origin
China — ~200 BC (Han dynasty) (-200)
Modernized Japanese jan-ken
Japan — Edo period ~1600-1868 (1700)
First English rulebook
West — 1927 (introduced to English-speaking world) (1927)
World RPS Society founding
Walker brothers (Douglas + Graham) — Original 1918 London; refounded Toronto 1996 (1918)
First World RPS Championship
WRPS (Toronto) — 2002 Toronto — first modern World Championship (2002)
Largest USARPS prize
Robert Lanka — $50,000 at 2007 USARPS/Bud Light final (2007)
Rock-Paper-Scissors-Lizard-Spock invention
Sam Kass + Karen Bryla — 1998 (published on internet; later popularized by Big Bang Theory 2008) (1998)
Big Bang Theory Lizard-Spock episode
CBS television — Episode "The Lizard-Spock Expansion" 2008; brought RPS-LS to mainstream (2008)
Federal court RPS ruling
Judge Gregory Presnell (Florida USA) — 2006 court order for RPS to resolve deposition dispute (2006)
AI vs Human RPS research
University of Tokyo + others — AI robots exploit human patterns; 60-70% win rate (2013)

Learn this sport

beginner

1
Learn 3 hand shapes (10 seconds)
Rock (fist), Paper (flat palm), Scissors (V fingers). Practice each.
2
Play 5-10 casual games
With friend or family. Learn count-off rhythm + simultaneous reveal.
3
Understand cyclic dominance
Rock > Scissors, Scissors > Paper, Paper > Rock. Simple + memorable.

intermediate

1
Learn first-move statistics
Men 55% Rock; women 39% Paper; adjust opening throws.
2
Practice pattern recognition
Notice opponent tendencies (losers switch, winners repeat). Play 20-30 matches.
3
Best-of-3 competitive play
Longer matches allow strategy depth. Play with friends + track win rate.
4
Try Rock-Paper-Scissors-Lizard-Spock
Add novelty; play with Big Bang Theory fan crowd.

advanced

1
Study Nash Equilibrium
Understand theoretical optimality (1/3 each). Use random.org for perfect randomization.
2
AI apps + pattern analysis
rockpaperscissors.io tracks your patterns + plays optimally. Learn own tendencies.
3
Local tournaments + charity events
Bars + festivals + corporate events host RPS tournaments for fun + charity.
4
World Rock Paper Scissors Championships (Toronto)
Annual WRPS Society event; $10K+ prize + international bragging rights.

Frequently asked

How do you play Rock Paper Scissors?+

SIMPLEST GAME EVER. 2 players (or more) face each other; count '1, 2, 3, shoot' (or 'ro-sham-bo' or 'jan-ken-pon'); on 'shoot' both players simultaneously reveal 1 of 3 hand shapes: (1) ROCK = closed fist. (2) PAPER = flat palm (fingers together). (3) SCISSORS = index + middle fingers extended in V. WINNER determined by cyclic dominance: (1) ROCK CRUSHES SCISSORS = rock wins. (2) SCISSORS CUTS PAPER = scissors wins. (3) PAPER COVERS ROCK = paper wins. SAME SHAPE = TIE; play again immediately. Best-of-3 or best-of-5 for extended matches. Used universally as decision-making tool — who pays check, who gets last cookie, order-of-play in other games. Zero equipment; zero cost; universally understood. Ancient origin in China (~200 BC); modernized in Japan (jan-ken, ~1600s Edo period); now played in every country worldwide.

Is there strategy in Rock Paper Scissors?+

YES + NO. THEORETICAL PERFECT PLAY = RANDOM. NASH EQUILIBRIUM strategy = play each shape with EQUAL 1/3 PROBABILITY; opponent can't exploit this. However, HUMANS CAN'T TRULY RANDOMIZE — subconscious patterns exist + are exploitable. STATISTICAL PATTERNS: (1) FIRST-MOVE: Men 55% ROCK; women 39% PAPER. (2) LOSERS TEND TO SWITCH symbols; WINNERS TEND TO REPEAT. (3) HUMANS AVOID TRIPLE REPEATS (won't play rock-rock-rock). (4) COUNTER-SYMMETRIC: if you know opponent's tendency, counter it. STRATEGY LEVELS: (1) LEVEL 0: Play random. (2) LEVEL 1: Exploit opponent patterns. (3) LEVEL 2: Bluff — do opposite of what opponent expects. (4) LEVEL 3: Meta-bluff — do what they expect me to do because they'll counter my bluff. AI ROBOTS regularly BEAT HUMANS 60-70% by exploiting subconscious patterns. HUMAN vs HUMAN: skilled pattern-reader has 55-60% edge over random opponent. Best strategy for CASUAL PLAY: try to be truly random (dice roll for perfect randomness). For COMPETITIVE PLAY (WRPS Championships): learn pattern exploitation + psychology. Considered a MIND SPORT with mental skill depth, though physical execution trivial.

Where did Rock Paper Scissors come from?+

ANCIENT CHINA ~200 BC. Called 'SHOUSHILING' (手勢令), 'shou' = hand, 'shi' = pose. Han dynasty text 'Bei Shi' describes hand-game with 3 shapes. Various local versions across China + Southeast Asia for 1500+ years. MODERN 3-SYMBOL FORM developed in JAPAN during EDO PERIOD (1600-1868). Called 'JAN-KEN' or 'JANKENPON' — 'jan' = signal, 'ken' = fist, 'pon' = throw. Traditional Japanese jan-ken uses same 3 shapes (rock, paper, scissors) that persist today. INTRODUCED TO WEST early 20th century via increased Japan-West trade + immigration. FIRST ENGLISH RULEBOOK published 1927 in USA. GLOBAL SPREAD via: (1) Japanese diaspora + trade. (2) Post-WWII Allied occupation of Japan brought game home to USA/UK. (3) Media + entertainment. NOW UNIVERSAL — every culture has RPS or equivalent. LATIN AMERICAN: 'piedra-papel-tijera.' FRENCH: 'pierre-papier-ciseaux.' GERMAN: 'Schere-Stein-Papier.' KOREAN: 'kai-bai-bo.' Similar hand-games exist in ancient Egypt, Greece, India, Persia. WRPS SOCIETY founded 1918 London; refounded Toronto 1996 for modern era. Ancient game with modern competitive scene + Nash Equilibrium mathematical analysis + AI research applications.

What is 'Rock-Paper-Scissors-Lizard-Spock'?+

5-hand variant invented by SAM KASS + KAREN BRYLA (1998) to reduce TIE frequency. Original RPS has 33% tie probability (same shape); RPSLS has 20% tie probability (only same-shape ties). RULES: (1) Rock crushes Scissors. (2) Scissors cuts Paper. (3) Paper covers Rock. (4) Rock crushes Lizard. (5) Lizard poisons Spock. (6) Spock smashes Scissors. (7) Scissors decapitates Lizard. (8) Lizard eats Paper. (9) Paper disproves Spock. (10) Spock vaporizes Rock. Each shape beats 2 others + loses to 2 others. HAND SHAPES: Rock (fist), Paper (flat palm), Scissors (V fingers), Lizard (hand puppet with fingers + thumb), Spock (Vulcan salute — 2 fingers apart). MASSIVE POPULARITY BOOST from CBS's BIG BANG THEORY television series — SHELDON COOPER explained variant in episode 'The Lizard-Spock Expansion' (2008); brought RPSLS to mainstream culture. Now widely known + played casually. HISTORY: Sam Kass invented + published online 1998; created to reduce annoying ties in classic RPS. Karen Bryla later credited as co-inventor. Big Bang Theory boost 2008 = massive cultural moment. STRATEGY: same principles as classic RPS (pattern exploitation) but 5-shape complexity requires more meta-thinking. FUN FACT: Sam Kass later became White House chef under Barack Obama.

Are there Rock Paper Scissors tournaments?+

YES — surprisingly ORGANIZED competitive scene. MAJOR EVENTS: (1) WORLD ROCK PAPER SCISSORS CHAMPIONSHIPS — annual event by World RPS Society (WRPS) since 2002, held in Toronto/Ottawa Canada. Hundreds of competitors from 15-25 countries; $10-15K first prize; official rules + judges; single-elimination bracket. Considered pinnacle of RPS competition. (2) USA ROCK PAPER SCISSORS LEAGUE (USARPS) — Bud Light-sponsored professional league 2006-2007. Televised on A&E network. 2007 final winner (Robert Lanka) received $50,000 grand prize. Discontinued after 2007. (3) UK ROCK PAPER SCISSORS CHAMPIONSHIPS — occasional national events since 2003. (4) LOCAL + CHARITY tournaments — bars, festivals, corporate team-building, charity fundraisers. (5) COLLEGE + UNIVERSITY intramural events. (6) ONLINE RPS — sites like rpsplay.com + apps host tournaments. FAMOUS CHAMPIONS: Bob Cooper (Canada, 2002 first World Champion); Peter Lovering (Canada, 2006); Tim Conrad (USA, 2003); Sean 'Wicked Fingers' Sears (USA, 2008); Andrea Farina (Italy, 2004 first European winner). WHY TOURNAMENTS WORK: (1) Fast-paced entertainment. (2) Simple rules universally understood. (3) Strategy + psychology depth (pattern recognition, bluffing). (4) Charity + fundraising angles. (5) Broadcast-friendly (short matches). Considered a MIND SPORT by some categorizations; certainly the world's most popular decision-making 'sport.'

Can you 'win' at Rock Paper Scissors long-term?+

MATHEMATICALLY vs random opponent: NO — you'll break even at 50% wins. Against PATTERNED HUMANS: YES — you can win 55-70% long-term via pattern exploitation. WHY BREAKING EVEN vs random: (1) NASH EQUILIBRIUM — playing 1/3 each shape is theoretically optimal against optimal opponent. (2) OVER many games, each shape wins/loses/ties 1/3 of time = 50% wins on non-ties. HOW TO WIN vs HUMANS: (1) HUMANS AREN'T RANDOM — subconscious patterns exist. (2) FIRST-MOVE STATS: Men 55% Rock; women 39% Paper. (3) WINNER-REPEAT / LOSER-SWITCH tendency. (4) AVOIDANCE OF TRIPLE-REPEATS. (5) EMOTIONAL PATTERNS (frustration after loss). AI EVIDENCE: (1) University of Tokyo built ROBOT that beats humans 100% by watching hand movement + reacting (technically cheating — instantaneous). (2) NON-CHEATING AI algorithms exploit patterns to win 60-70% consistently. (3) rockpaperscissors.io + similar apps track your patterns + play optimally. HUMAN vs HUMAN: (1) Skilled pattern-reader vs novice: 55-60% edge. (2) Two experts: converges toward 50% + variance. HOW TO BE UNBEATABLE: (1) TRUE RANDOMIZATION — dice roll or random.org; opponent can't exploit if you can't be predicted. (2) NASH EQUILIBRIUM PLAY = tie in long run against optimal opponent. LIMIT: variance means short-term losses even with optimal play. RPS = MIND SPORT with real strategic depth despite simple rules.

Sources & provenance

Wikipedia — Rock paper scissors— Wikipedia
World RPS Society— WRPS
Wikipedia — Rock paper scissors lizard Spock— Wikipedia

Last verified 2026-08-25.verified