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Tic-tac-toe
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{{Short description|Paper-and-pencil game for two players}}{{Redirect-multi|2|Noughts and Crosses|Tic Tac Toe}}{{Use American English|date=July 2020}}{{Use mdy dates|date=February 2024}}- the content below is remote from Wikipedia
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italic title | no| title = Tic-tac-toe
| 200px)| image_caption = A completed game of tic-tac-toe| years = | genre = Paper-and-pencil game| players = 2| setup_time = Minimal| playing_time = ~1 minute| random_chance = None | Strategy game>Strategy, tactics, observation}}Tic-tac-toe (American English), noughts and crosses (Commonwealth English), or Xs and Os (Canadian or Irish English) is a paper-and-pencil game for two players who take turns marking the spaces in a three-by-three grid with X or O. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row is the winner. It is a solved game, with a forced draw assuming best play from both players.NamesIn American English, the game is known as "tic-tac-toe". It may also be spelled "tick-tack-toe", "tick-tat-toe", or "tit-tat-toe".WEB, Garcia, Dan, GamesCrafters: Tic-Tac-Toe,weblink June 8, 2021, gamescrafters.berkeley.edu, WEB, July 1, 2019, The History of Tic Tac Toe and Where it is Now,weblink June 8, 2021, Aurosi, en-US, In Commonwealth English (particularly British, South African, Indian, Australian, and New Zealand English), the game is known as "noughts and crosses", alternatively spelled "naughts and crosses". This name derives from the shape of the marks in the game (i.e the X and O); "nought" is an older name for the number zero, while "cross" refers to the X shape. While the term "nought" is now less commonly used, the name "noughts and crosses" is still preferred over the American name "tic-tac-toe" in these countries.Sometimes, tic-tac-toe (where players keep adding "pieces") and three men's morris (where pieces start to move after a certain number have been placed) are confused with each other.GameplayTic-tac-toe is played on a three-by-three grid by two players, who alternately place the marks X and O in one of the nine spaces in the grid.In the following example, the first player (X) wins the game in seven steps:(File:tic-tac-toe-game-1.svg|center|Game of Tic-tac-toe, won by X)There is no universally agreed rule as to who plays first, but in this article the convention that X plays first is used.Players soon discover that the best play from both parties leads to a draw. Hence, tic-tac-toe is often played by young children who may not have discovered the optimal strategy.Because of the simplicity of tic-tac-toe, it is often used as a pedagogical tool for teaching the concepts of good sportsmanship and the branch of artificial intelligence that deals with the searching of game trees. It is straightforward to write a computer program to play tic-tac-toe perfectly or to enumerate the 765 essentially different positions (the state space complexity) or the 26,830 possible games up to rotations and reflections (the game tree complexity) on this space.WEB,weblink MathRec Solutions (Tic-Tac-Toe), Mathematical Recreations, Steve, Schaefer, 2002, September 18, 2015, June 28, 2013,weblink" title="web.archive.org/web/20130628112339weblink">weblink dead, If played optimally by both players, the game always ends in a draw, making tic-tac-toe a futile game.WEB,weblink Tic-Tac-Toe, W., Weisstein, Eric, mathworld.wolfram.com, en, May 12, 2017, File:Three Men's Morris variant board.svg|thumb|160px|Incidence structureIncidence structureThe game can be generalized to an m,n,k-game, in which two players alternate placing stones of their own color on an m-by-n board with the goal of getting k of their own color in a row. Tic-tac-toe is the 3,3,3-game.BOOK, Pham, Duc-Nghia, Park, Seong-Bae, PRICAI 2014: Trends in Artificial Intelligence: 13th Pacific Rim International Conference on Artificial Intelligence,weblink November 12, 2014, Springer, 978-3-319-13560-1, 735, Harary's generalized tic-tac-toe is an even broader generalization of tic-tac-toe. It can also be generalized as an nd game, specifically one in which n = 3 and d = 2. It can be generalised even further by playing on an arbitrary incidence structure, where rows are lines and cells are points. Tic-tac-toe's incidence structure consists of nine points, three horizontal lines, three vertical lines, and two diagonal lines, with each line consisting of at least three points.HistoryGames played on three-in-a-row boards can be traced back to ancient Egypt,BOOK, Zaslavsky, Claudia, Claudia Zaslavsky, Tic Tac Toe: And Other Three-In-A Row Games from Ancient Egypt to the Modern Computer, 1982, Crowell, 0-690-04316-3,weblink registration, where such game boards have been found on roofing tiles dating from around 1300 BC.BOOK, Parker, Marla, She Does Math!: Real-life Problems from Women on the Job,weblink 1995, Mathematical Association of America, 978-0-88385-702-1, 153, An early variation of tic-tac-toe was played in the Roman Empire, around the first century BC. It was called terni lapilli (three pebbles at a time) and instead of having any number of pieces, each player had only three; thus, they had to move them around to empty spaces to keep playing.WEB,weblink Tic tac toe Ancient Roman 1st century BC, Sweetooth Design Company, December 4, 2016, The game's grid markings have been found chalked all over Rome. Another closely related ancient game is three men's morris which is also played on a simple grid and requires three pieces in a row to finish,WEB,weblink Morris Games, www-cs.canisius.edu, September 5, 2012, March 13, 2013,weblink" title="web.archive.org/web/20130313100626weblink">weblink dead, and Picaria, a game of the Puebloans.The different names of the game are more recent. The first print reference to "noughts and crosses" (nought being an alternative word for 'zero'), the British name, appeared in 1858, in an issue of Notes and Queries.WIKISOURCE, Page:Notes and Queries â Series 2 â Volume 6.djvu/441, Notes and Queries, Series 2, VI, 152, The first print reference to a game called "tick-tack-toe" occurred in 1884, but referred to "a children's game played on a slate, consisting of trying with the eyes shut to bring the pencil down on one of the numbers of a set, the number hit being scored". "Tic-tac-toe" may also derive from "tick-tack", the name of an old version of backgammon first described in 1558. The US renaming of "noughts and crosses" to "tic-tac-toe" occurred in the 20th century.Oxford English Dictionary entries for "Noughts and Crosses", "Tick-Tack" and "Tick-Tack-Toe", dictionary.oed.comIn 1952, OXO (or Noughts and Crosses), developed by British computer scientist Sandy Douglas for the EDSAC computer at the University of Cambridge, became one of the first known video games.BOOK, Encyclopedia of Video Games: The Culture, Technology, and Art of Gaming, Wolf, Mark J. P., August 16, 2012, Greenwood Publishing Group, 978-0-313-37936-9, 3â7, WEB, Cohen, D.S., OXO aka Noughts and Crosses, Lifewire, March 12, 2019,weblink August 29, 2019, The computer player could play perfect games of tic-tac-toe against a human opponent.In 1975, tic-tac-toe was also used by MIT students to demonstrate the computational power of Tinkertoy elements. The Tinkertoy computer, made out of (almost) only Tinkertoys, is able to play tic-tac-toe perfectly.WEB,weblink Tinkertoys and tic-tac-toe, September 27, 2007, dead,weblink" title="web.archive.org/web/20070824200126weblink">weblink August 24, 2007, It is currently on display at the Computer History Museum.BOOK,weblink Original Tinkertoy Computer, January 5, 1978,CombinatoricsWhen considering only the state of the board, and after taking into account board symmetries (i.e. rotations and reflections), there are only 138 terminal board positions. A combinatorics study of the game shows that when "X" makes the first move every time, the game outcomes are as follows:BOOK, Bolon, Thomas, How to never lose at Tic-Tac-Toe,weblink 2013, BookCountry, 978-1-4630-0192-6, 7,
Strategy(File:Tictactoe-X.svg|thumb|right|Optimal strategy for player X if starting in upper left. In each grid, the shaded red X denotes the optimal move, and the location of O's next move gives the next subgrid to examine. Only two sequences of moves by O (both starting with the center, top-right, left-mid) lead to a draw, with the remaining sequences leading to wins from X.)(File:Tictactoe-O.svg|thumb|right|Optimal strategy for player O. Player O can only force a win or draw by playing in the center first.)A player can play a perfect game of tic-tac-toe (to win or at least draw) if, each time it is their turn to play, they choose the first available move from the following list, as used in Newell and Simon's 1972 tic-tac-toe program.JOURNAL, Flexible Strategy Use in Young Children's Tic-Tac-Toe, Kevin Crowley, Robert S. Siegler, Cognitive Science, 17, 531â561, 1993, 4, 10.1207/s15516709cog1704_3, free,
Further detailsConsider a board with the nine positions numbered as follows:{| class="wikitable" | en}}1{{spaces|en}} | en}}2{{spaces|en}} | en}}3{{spaces|en}} | |
en}}4{{spaces|en}} | en}}5{{spaces|en}} | en}}6{{spaces|en}} | |||||
en}}7{{spaces|en}} | en}}8{{spaces|en}} | en}}9{{spaces|en}} |
- X1 â O5 â X9 â O2 â X8 â O7 â X3 â O6 â X4, this game will be a draw.
- X1 â O5 â X6 â O2 â X8, then O should not take 3, or X can take 7 to win, and O should not take 4, or X can take 9 to win, O should take 7 or 9.
- X1 â O5 â X6 â O2 â X8 â O7 â X3 â O9 â X4, this game will be a draw.
- X1 â O5 â X6 â O2 â X8 â O9 â X4 (7) â O7 (4) â X3, this game will be a draw.
- X1 â O5 â X6 â O3 â X7 â O4 â X8 (9) â O9 (8) â X2, this game will be a draw.
- X1 â O5 â X6 â O8 â X2 â O3 â X7 â O4 â X9, this game will be a draw.
- X1 â O5 â X6 â O9, then X should not take 4, or O can take 7 to win, X should take 2, 3, 7 or 8.
- X1 â O5 â X6 â O9 â X2 â O3 â X7 â O4 â X8, this game will be a draw.
- X1 â O5 â X6 â O9 â X3 â O2 â X8 â O4 (7) â X7 (4), this game will be a draw.
- X1 â O5 â X6 â O9 â X7 â O4 â X2 (3) â O3 (2) â X8, this game will be a draw.
- X1 â O5 â X6 â O9 â X8 â O2 (3, 4, 7) â X4/7 (4/7, 2/3, 2/3) â O7/4 (7/4, 3/2, 3/2) â X3 (2, 7, 4), this game will be a draw.
- X1 â O5 â X2 â O3 â X7 â O4 â X6 â O8 (9) â X9 (8), this game will be a draw.
- X1 â O5 â X3 â O2 â X8 â O4 (6) â X6 (4) â O9 (7) â X7 (9), this game will be a draw.
- X1 â O5 â X9 â O3 â X7, then X can take 4 or 8 to win.
- X1 â O5 â X6 â O4 â X3, then X can take 7 or 9 to win.
- X1 â O5 â X6 â O7 â X3, then X can take 2 or 9 to win.
- X1 â O5 â X6 â O2 â X8 â O3 â X7, then X can take 4 or 9 to win.
- X1 â O5 â X6 â O2 â X8 â O4 â X9, then X can take 3 or 7 to win.
- X1 â O3 â X7 â O4 â X9, then X can take 5 or 8 to win.
- X1 â O9 â X3 â O2 â X7, then X can take 4 or 5 to win.
- X1 â O2 â X5 â O9 â X7, then X can take 3 or 4 to win.
- X1 â O6 â X5 â O9 â X3, then X can take 2 or 7 to win.
Variations
Many board games share the element of trying to be the first to get n-in-a-row, including three men's morris, nine men's morris, pente, gomoku, Qubic, Connect Four, Tick-Oat-Two, Quarto, Gobblet, Order and Chaos, Toss Across, and Mojo. Tic-tac-toe is an instance of an m,n,k-game, where two players alternate taking turns on an mÃn board until one of them gets k in a row. Harary's generalized tic-tac-toe is an even broader generalization. The game can be generalised even further by playing on an arbitrary hypergraph, where rows are hyperedges and cells are vertices.Other variations of tic-tac-toe include:- 3-dimensional tic-tac-toe on a 3Ã3Ã3 board. In this game, the first player has an easy win by playing in the centre if 2 people are playing.
- In misère tic-tac-toe, the player wins if the opponent gets n in a row.BOOK, Averbach, Bonnie, Bonnie Averbach, Chein, Orin, Problem Solving Through Recreational Mathematics, Problem Solving Through Recreational Mathematics, 252, 2000, Dover Publications, 978-0-486-40917-7, A 3Ã3 game is a draw. More generally, the first player can draw or win on any board (of any dimension) whose side length is odd, by playing first in the central cell and then mirroring the opponent's moves.JOURNAL, Solomon W.,weblink Hypercube tic-tac-toe, Cambridge Univ. Press, Alfred W., More Games of No Chance (Berkeley, CA, 2000), Golomb, Hales, 1973012, Math. Sci. Res. Inst. Publ., 2002, 42, 167â182,weblink" title="web.archive.org/web/20110206014531weblink">weblink February 6, 2011, live,
- In "wild" tic-tac-toe, players can choose to place either X or O on each move.BOOK, Mendelson, Elliott, Introducing Game Theory and its Applications,weblink 2016, CRC Press, 978-1-4822-8587-1, 19, WEB, Wild Tic-Tac-Toe, Puzzles in Education, December 11, 2007,weblink August 29, 2019, BOOK, Epstein, Richard A., The Theory of Gambling and Statistical Logic,weblink December 28, 2012, Academic Press, 978-0-12-397870-7, 450,
- Number Scrabble or Pick15BOOK, Juul, Jesper, Half-Real: Video Games Between Real Rules and Fictional Worlds,weblink 2011, MIT Press, 978-0-262-51651-8, 51, is isomorphic to tic-tac-toe but on the surface appears completely different.JOURNAL, Michon, John A., January 1, 1967, The Game of JAM: An Isomorph of Tic-Tac-Toe, 1420555, The American Journal of Psychology, 80, 1, 137â140, 10.2307/1420555, 6036351, Two players in turn say a number between one and nine. A particular number may not be repeated. The game is won by the player who has said three numbers whose sum is 15.WEB,weblink TicTacToe Magic, December 17, 2016,weblink December 20, 2016, dead, If all the numbers are used and no one gets three numbers that add up to 15 then the game is a draw. Plotting these numbers on a 3Ã3 magic square shows that the game exactly corresponds with tic-tac-toe, since three numbers will be arranged in a straight line if and only if they total 15.WEB, Tic-Tac-Toe as a Magic Square, Oh Boy! I Get to do Math!, May 30, 2015,weblink August 29, 2019, {| border="0" cellpadding="4" cellspacing="0" style="float:right;background:white !important;font:100% monospace;text-align:center;"
!{{silver (color)|f}}{{fuchsia|e}}{{black|a}}{{red|r}}!{{brown|o}}{{red|r}}!{{cyan|t}}{{red|r}}{{orange|y}}!â {{red|r}} !{{blue|b}}{{fuchsia|e}}!{{blue|b}}{{brown|o}}{{black|a}}{{cyan|t}}!{{blue|b}}{{orange|y}}!â {{blue|b}} !{{cyan|t}}{{fuchsia|e}}{{lime|n}}!{{brown|o}}{{lime|n}}!{{black|a}}{{lime|n}}{{orange|y}}!â {{lime|n}} ! â{{cyan|t}}!â{{fuchsia|e}}!â{{brown|o}}!â{{orange|y}}!â {{black|a}} - Another isomorphic game uses a list of nine carefully chosen words, for instance "try", "be", "on", "any", "boat", "by", "ten", "or", and "fear". Each player picks one word in turn and to win, a player must select three words with the same letter. The words may be plotted on a tic-tac-toe grid in such a way that a three-in-a-row line wins.BOOK, Schumer, Peter D., Mathematical Journeys,weblink 2004, John Wiley & Sons, 978-0-471-22066-4, 71â72,
- Numerical tic-tac-toe is a variation invented by the mathematician Ronald Graham. The numbers 1 to 9 are used in this game. The first player plays with the odd numbers, and the second player plays with the even numbers. All numbers can be used only once. The player who puts down 15 points in a line wins (sum of 3 numbers).
- In the 1970s, there was a two-player game made by Tri-ang Toys & Games called Check Lines, in which the board consisted of eleven holes arranged in a geometrical pattern of twelve straight lines each containing three of the holes. Each player had exactly five tokens and played in turn placing one token in any of the holes. The winner was the first player whose tokens were arranged in two lines of three (which by definition were intersecting lines). If neither player had won by the tenth turn, subsequent turns consisted of moving one of one's own tokens to the remaining empty hole, with the constraint that this move could only be from an adjacent hole.WEB, Check Lines, BoardGameGeek,weblink August 29, 2019,
- There is also a variant of the game with the classic 3Ã3 field, in which it is necessary to make two rows to win, while the opposing algorithm only needs one.Twice crosses-circles
- Quantum tic-tac-toe allows players to place a quantum superposition of numbers on the board, i.e. the players' moves are "superpositions" of plays in the original classical game. This variation was invented by Allan Goff of Novatia Labs.JOURNAL, Goff, Allan, November 2006, Quantum tic-tac-toe: A teaching metaphor for superposition in quantum mechanics, American Journal of Physics, College Park, MD, American Association of Physics Teachers, 74, 11, 962â973, 10.1119/1.2213635, 0002-9505, 2006AmJPh..74..962G,
In popular culture
- George Cooper wrote the words and John Rogers Thomas wrote the music for a song "Tit, Tac, Toe" in 1876.WEB, Tit, tat, toe,weblink August 29, 2019, The Library of Congress,
- Episode 452 of This American LifeWEB, 452: Poultry Slam 2011,weblink This American Life, May 28, 2016, December 2, 2011, recounts the true story of a legal defense team that sought to overturn the state of Florida's decision to execute a mentally ill murderer by eliciting a tic-tac-toe-playing chicken as evidence. Arcade games with tic-tac-toe-playing chickens were popular in the mid-1970s; the animals were trained using operant conditioning,MAGAZINE,weblink The Chicken Vanishes, Trillin, Calvin, February 1, 1999, The New Yorker, August 29, 2019, 0028-792X, with the moves being chosen by computer and indicated to the chicken with a light invisible to the human player.WEB,weblink Why did the chicken win the game? Conditioning, August 28, 2018, Star Tribune, September 15, 2019,
- In the 1983 science-fiction film WarGames, global thermonuclear war is described as similar to tic-tac-toe, in that if all sides engage in full-scale use of their arsenals with the most effective strategies possible, no side will actually win.
- On Hollywood Squares, nine celebrities filled the cells of the tic-tac-toe grid; players put symbols on the board by correctly agreeing or disagreeing with a celebrity's answer to a question. Variations of the show include Storybook Squares and Hip Hop Squares. The British version was Celebrity Squares. Australia had various versions under the names of Celebrity Squares, Personality Squares and All Star Squares.
- In Tic-Tac-Dough, players put symbols up on the board by answering questions in various categories, which shuffle after both players have taken both turns.
- In Beat the Teacher, contestants answer questions to win a turn to influence a tic-tac-toe grid.
- On The Price Is Right, several national variants feature a pricing game called "Secret X", in which players must guess prices of two small prizes to win Xs (in addition to one free X) to place on a blank board. They must place the Xs in position to guess the location of the titular "secret X" hidden in the center column of the board and form a tic-tac-toe line horizontally (across) or diagonally (no vertical lines allowed). There are no Os in this variant of the game.
- On Minute to Win It, the game Ping Tac Toe has one contestant playing the game with nine water-filled glasses and white and orange ping-pong balls, trying to get three in a row of either color. They must alternate colors after each successful landing and must be careful not to block themself.
See also
References
{{Reflist}}External links
- {{Wiktionary-inline}}
- {{Commons category-inline|Tic Tac Toe}}
- WEB, Tic-Tac-Toe, Wolfram MathWorld, March 11, 2002,weblink
- WEB, etymology â Why is a tie in Tic-Tac-Toe called a "Cat's Game?", English Language & Usage Stack Exchange, March 5, 2014,weblink â Discussion about the term "cat's game" for a drawn game of tic-tac-toe
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