# Which popular games are the most mathematical?

I consider a game to be mathematical if there is interesting mathematics (to a mathematician) involved in

• the game's structure,
• optimal strategies,
• practical strategies,
• analysis of the game results/performance.

Which popular games are particularly mathematical by this definition?

Motivation: I got into backgammon a bit over 10 years ago after overhearing Rob Kirby say to another mathematician at MSRI that he thought backgammon was a game worth studying. Since then, I have written over 100 articles on the mathematics of backgammon as a columnist for a backgammon magazine. My target audience is backgammon players, not mathematicians, so much of the material I cover is not mathematically interesting to a mathematician. However, I have been able to include topics such as martingale decomposition, deconvolution, divergent series, first passage times, stable distributions, stochastic differential equations, the reflection principle in combinatorics, asymptotic behavior of recurrences, $\chi^2$ statistical analysis, variance reduction in Monte Carlo simulations, etc. I have also made a few videos for a poker instruction site, and I am collaborating on a book on practical applications of mathematics to poker aimed at poker players. I would like to know which other games can be used similarly as a way to popularize mathematics, and which games I am likely to appreciate more as a mathematician than the general population will.

Other examples:

• go
• bridge
• Set.

Non-example: I do not believe chess is mathematical, despite the popular conception that chess and mathematics are related. Game theory says almost nothing about chess. The rules seem mathematically arbitrary. Most of the analysis in chess is mathematically meaningless, since positions are won, drawn, or tied (some minor complications can occur with the 50 move rule), and yet chess players distinguish strong moves from even stronger moves, and usually can't determine the true value of a position.

To me, the most mathematical aspect of chess is that the linear evaluation of piece strength is highly correlated which side can win in the end game. Second, there is a logarithmic rating system in which all chess players say they are underrated by 150 points. (Not all games have good rating systems.) However, these are not enough for me to consider chess to be mathematical. I can't imagine writing many columns on the mathematics of chess aimed at chess players.

Non-example: I would exclude Nim. Nim has a highly mathematical structure and optimal strategy, but I do not consider it a popular game since I don't know people who actually play Nim for fun.

To clarify, I want the games as played to be mathematical. It does not count if there are mathematical puzzles you can describe on the same board. Does being a mathematician help you to learn the game faster, to play the game better, or to analyze the game more accurately? (As opposed to a smart philosopher or engineer...) If mathematics helps significantly in a game people actually play, particularly if interesting mathematics is involved in a surprising way, then it qualifies to be in this collection.

If my criteria seem horribly arbitrary as some have commented, so be it, but this seems in line with questions like Real world applications of math, by arxive subject area? or Cocktail party math. I'm asking for applications of real mathematics to games people actually play. If someone is unconvinced that mathematics says anything they care about, and you find out he plays go, then you can describe something he might appreciate if you understand combinatorial game theory and how this arises naturally in go endgames.

• Yeah, well the rules of mathematics are chessly arbitrary. Feb 1, 2010 at 11:19
• I think it's a mischaracterization to say chess is nonmathematical; it's just that chess, like so many things one encounters in the real world, is neither elegant nor simple from the point of view of mathematics. That game theory can't tell us much about chess tells us more about the limitations of game theory than about the mathematical nature of chess. That said, your suggested examples are definitely better. Feb 1, 2010 at 14:29
• This is very far from 'give a list of all games.' One hope is to find other popular games whose play involves mathematics. Another is to learn more real mathematics about games I already know. A third idea is to see what resonates with other mathematicians. I'm sorry if you don't find these interesting, or if you find my criteria arbitrary--I don't see a huge difference between this and questions like, "What are neat applications of mathematics/this field?" Feb 1, 2010 at 17:56
• You disagree with my statement that Nim is not actually played for fun? I can show you go clubs, bridge clubs, backgammon clubs, even a "world championship of rock-paper-scissors," etc. I've never seen a Nim club or heard someone describe himself or herself as a Nim player. There are many theoretical games people don't actually play, and I don't think it's arbitrary to exclude those. I'll clarify my reasons for excluding chess later. Feb 1, 2010 at 23:17
• In "l'année dernière à Marienbad" ("last year in Marienbad"), a movie by Alain Resnais, you can see people playing Nim for fun. Now this just moves the problem, because I don't know anyone watching that movie for fun. (I just mean that peculiar movie. Resnais made a lot of very good movies. But that one is a serious contender for the prize of the most boring movie ever).
– Joël
Oct 7, 2011 at 19:31

The Legend of Zelda and several other classic Nintendo games are NP-hard. https://arxiv.org/pdf/1203.1895v1.pdf

Following the example of Rubik's Cube (i.e. maybe not exactly a game), as a kid I was fascinated by Spirograph and played it for hours on end.

There is always "Who can name the bigger number" (you can win the computable version (second link below) with large cardinals):

Pool (aka billiards) has always seemed mathematical to me. A buddy of mine told me he learned about PDE's from trying to calculate the motion of a ping pong ball (laminar airflow etc).

Enough, I'll stop.

There is a popular game in current cellphones called Pixelated (in BlackBerry) or Flood-It (in iPhone) that has a very interesting analysis (its generalization is equivalent to the Shortest superstring problem): https://arxiv.org/abs/1001.4420 http://www.cs.bris.ac.uk/Research/Algorithms/BAD10/Slides/Jalsenius.pdf

• The second link seems to be dead. May 23 at 5:37

Well, most card games have mathematical implications, of course.

I'm disappointed at your considering chess non-mathematical. Wonder what Noam Elkies would think. :-)

When I was a teenager I would play a lot a board game named here "Risiko!" (I believe that the English name is "Risk"). My impression then was that there were some mathematical aspects that could be considered while planning a strategy.

Also Hex should be added to the list of mathematically interesting games.

• We don't play risk anymore at my house because it always ends in either a verbal argument or a physical confrontation. =\. Feb 1, 2010 at 11:37
• You mention card games. In Cryptonomicon book by Neal Stephenson ( great one!) there is a solitaire card game which gives You a cipher called SOLITARE strong enough to be "industry standard" whilst still may be performed without computer (only with a card deck only!). It was analysed by Bruce Schneier and this analysis is part of the book! en.wikipedia.org/wiki/Solitaire_%28cipher%29 Mar 2, 2010 at 14:24

Battle Line (originally published under the name Schotten-Totten) is a simple 2-player strategy card game designed by noted boardgame designer and math PhD Reiner Knizia. The goal is to try to capture a majority of the flags, which are contested regions where each player assigns troops to try and dominate. It has a number of mathematical elements, the most interesting of which, to me, is that during the course of the game you are allowed to capture a flag at any time that you can prove that your troops will be the strongest possible based on public information (the cards that have been played already).

There's also Nine Men's Morris, which is a very ancient game. My understanding is that it has been effectively solved in recent years with the help of computer analysis.

StarCraft, a very popular RTS, which is taught at Berkeley. https://kotaku.com/competitive-starcraft-gets-uc-berkeley-class-5141355

where "Calculus and Differential Equations are highly recommended for full understanding of the course.".

• That class doesn't seem to have anything to do with math Jan 9, 2018 at 21:21
• @DavidWhite: The course description on the website states "Calculus and Differential Equations are highly recommended for full understanding of the course. " Sounds quite math-heavy to me. Jan 10, 2018 at 18:00

Baseball fits the criteria of math underlying the game's structure, its optimal and practical strategies, and the analysis of results and performance. It certainly fits the criterion of popularity.

• I'd distinguish between "baseball" as played by athletes and "moneyball" as "played" by team owners. The latter is arguably very mathematical, but the former is much less so. Jan 30, 2013 at 19:06

I’d like to emphasize that typical sports games (eg. played at Olympic games, NFL, MLB, NBA, NHL) often fit at least three criteria mentioned in the question. Before me, Barry Cipra mentioned baseball. These games are very useful to ‘popularize mathematics’, more precisely applied mathematics (operations research). Being a mathematician can help you play the game better (sometimes as a coach because we think of optimal strategies). And ‘mathematics is involved in a surprising way’ as people (students) generally don’t expect mathematics can help in such situations. The techniques used involve eg. dynamic programming, probability trees, game theory and Monte Carlo methods. As examples, I could give the following papers: a) Beaudoin, D., & Swartz, T. B. (2010). Strategies for pulling the goalie in hockey. The American Statistician, 64(3), 197-204; b) Clarke, S. R., & Norman, J. M. (2012). Optimal challenges in tennis. Journal of the Operational Research Society, 63(12), 1765-1772 c) Annis, D. H. (2006). Optimal end-game strategy in basketball. J Quant Anal Sports, 2(2). d) Kostuk, K. J., & Willoughby, K. A. (2006). Curling's paradox. Computers & operations research, 33(7), 2023-2031. e) Chiappori, P. A., Levitt, S., & Groseclose, T. (2002). Testing mixed-strategy equilibria when players are heterogeneous: the case of penalty kicks in soccer. American Economic Review, 1138-1151. f) Tibshirani, R. J., Price, A., & Taylor, J. (2011). A statistician plays darts. Journal of the Royal Statistical Society: Series A (Statistics in Society), 174(1), 213-226.

For more on the topic, I recommend (Wright MB. “50 years of OR in Sport”. Journal of the Operational Research Society (2009) 60:S161-S168) or the short intro to this paper to be found here: http://ifors.org/web/ifors-september-2009-newsletter/. Moreover, Journal of Quantitative Analysis in Sports can also be of interest.

The page https://www.toothycat.net/~hologram/Turing/index.html claims that the popular trading card game Magic: The Gathering is Turing complete. Some mathematician who knows the rules should recheck the proof.

Rummikub ? It encourages some logical thought and analysis. It seems to have at least one mathematical paper on it1

https://doi.org/10.1093/comjnl/bxl033

and it's popular and fun.

1D. Den Hertog, P. B. Hulshof, Solving Rummikub Problems by Integer Linear Programming, The Computer Journal, Volume 49, Issue 6, November 2006, Pages 665–669, https://doi.org/10.1093/comjnl/bxl033

There is the amazing set of one-player games presented by S. Tatham (especially loopy and towers):

https://www.chiark.greenend.org.uk/~sgtatham/puzzles/

You should try it !

Damien.

Khet is a great new game awarded by Mensa. There is even a master thesis dedicated to it: http://www.personeel.unimaas.nl/Uiterwijk/Theses/MSc/Nijssen_thesis.pdf

Untangle (available in Debian based distros and easy online HTML5 version

From the documentation:

You are given a number of points, some of which have lines drawn between them. You can move the points about arbitrarily; your aim is to position the points so that no line crosses another.

Heads or Tails - Is it popular game? There is a lot of mathematics related with this game. For example, it's non-transitive variant - Penney's game.

• Obverse or reverse! Feb 1, 2010 at 11:36

The two-player single suit whist has been analyzed completely in this paper by Johan Wastlund. This was mentioned by Alison Miller in her answer to my MO question Bridge game with only one suit: strategy.

I am a bit surprised that Dominion has not been mentioned yet. I am referring less to the gameplay itself rather than to the analyzes that people do in order to assess the "intrinsic worth" or "situational worth" (my terms) of a card or a strategy, using a rather complicated simulator. I perceive it as a kind of Monter Carlo analysis.

• What is mathematical about Dominion? Jan 30, 2013 at 18:58
• @TimothyChow: I added a bit of explanation. Jan 31, 2013 at 9:26

There are various map/graph colouring games which are more subtle than determining the chromatic number. For example take a planar graph or map (particular or restricted to some category) - how many colours can P1 force P2 to use: or who wins if the first person forced to use a fifth colour loses?

Just a two cents worth here. :) Chess itself might perhaps not be too mathematical, but the chess evaluation functions of any chess-playing computer program seems like a mathematical object. After all, these are maps from the set of chess positions to $\mathbb{R}$ and they are bound to satisfy various properties. Given any two chess programs that are both strong and might be expected to be decent (in terms of current technology) approximations to objective truth, one might probably expect them to be "close" in some meaningful way that one could perhaps attempt to define.

• In some games, computer programs evaluate positions, and choose to play the position with the highest evaluation, perhaps among a restricted set of candidates. Backgammon is an example. However, many competitive chess programs don't fit this description. Instead of evaluating positions they often directly choose the move to make, based on partial searches of the game tree that are affected by the amount of time left. A computer might try to spend ten seconds, quitting early if it finds a mate, but otherwise reporting its best candidate after that time. This might not be repeatable. Sep 10, 2015 at 22:17

Othello, since the number of the opponent's pieces you can flip highly depends on where you put yours.

• What gives a mathematician an advantage when playing or studying Othello over an equally smart engineer or philosopher? I learned to play Othello at a decent level to win a multi-game tournament, and I don't recall anything standing out. The moves don't commute, unlike in Lights Out, and the endgame seems to require a brute-force search. If you look at the opening heuristic of trying to minimize your exposed pieces, this could resemble games in combinatorial game theory. Apr 29, 2015 at 13:57

Spot it! or Dobble (https://de.wikipedia.org/wiki/Dobble) is a game with 57 cards, each showing 8 symbols. For every pair of cards, there is exactly one common symbol. This is possible because of the projective plane with the cards as points and the common symbols as lines, and it is 57=8^2-8+1.

Blood Bowl! All about managing probability. https://en.wikipedia.org/wiki/Blood_bowl

Being a mathematician allows you to play the game of chess better.

Mathematicians perform calculations quickly and accurately. Mathematicians are creative. Mathematicians are good at identifying the important component to a problem. Mathematicians are accustomed to encountering new problems and challenges. Mathematicians are good at comparing alternatives.

Now consider the game of chess. At any level 90%+ of chess games end as a result of an oversight in calculation. This often happens because one misses a surprising or unconventional move that requires creativity. In chess there are many strategic components, pawn structure, piece activity, material imbalance, king safety etc. but often one of these takes center stage. Almost always in a game of chess there will be a situation you have never encountered before. 90+% of grandmaster chess moves would be listed in the top 5 choices of any tournament player but consistently play the third or fourth choice move is a recipe for disaster even in scholastic chess.

I can not think of a profession better suited to playing chess than that of mathematician!

• Yes, and few mathematicians rise above B class. Sad. Jan 14, 2011 at 21:40
• The best mathematician chess players in history are: Emmanuel Lasker John Nunn (who appears to have published in "Topology" as J. D. M. Nunn). There are some people who were strong masters once upon a time (Sarnak,Formanek) I don't agree with Doug's claim that time pressure is the culprit (many good mathematicians were good at mathematics contests), but the real point (imho) is that the amount of self-discipline and effort needed to become a strong tournament chess player is much greater than the intrinsic interest of the game (if you want to work that hard, why not work on mathematics? Jan 16, 2011 at 21:58
• Well, in my college chess teams, most of the chess players were studying mathematics or computer science; but it was very noticeable that the best mathematicians were only average chess players, and vice versa, with few exceptions. (And, several of the top mathematicians didn't play at all). Former World Chess Champion Karpov gave up mathematics at university because mathematics and chess were "incompatible". These are not statistically significant samples, of course! Jun 8, 2011 at 1:24
• Former world champion Dr. Botvinnik was also an electrical engineer. Jun 8, 2011 at 1:28
• Former world champion Dr. Euwe was a mathematician and a computer scientist. Jul 8, 2013 at 13:51

Has no one mentioned Finchley Central and the other games discussed in Volume 3 (1969) of Manifold? Available here, starting on page 31.

• I'm afraid I don't understand the payoffs of that game. Is/was it popular? Apr 29, 2015 at 13:48
• Variants of Finchley Central have been popular, e.g., Mornington Crescent, en.wikipedia.org/wiki/Mornington_Crescent_(game). "Finchley Central and Mornington Crescent became popular in the United Kingdom as a play-by-mail pastime, and in the 1980s were played by post in a number of play-by-mail magazines. One format involved a series of elimination rounds, with everyone except the winner of the current round going forward onto the next. Mornington Crescent is now played widely online, in the spirit of the radio series. Games are played by fans on Usenet, in diverse web forums, and ... Apr 30, 2015 at 1:49
• "...on the London Underground itself. A Facebook application has also been produced." The game has also been compared to the game, World War Three (see, e.g., www1.maths.leeds.ac.uk/~pmt6jrp/personal/quintics.html). Apr 30, 2015 at 1:52
• Although I do like Mornington Crescent, it really doesn't count because it doesn't actually have any rules - there is no mathematics involved. You might as well suggest Numberwang. Nov 22, 2015 at 19:15
• @GerryMyerson: youtube.com/results?search_query=numberwang Nov 23, 2015 at 4:47

Games are mathematical. That's not something you can avoid. If there are rules for moves and goal states, you've already entered mathematics through logic and proof theory. And even for the simplest games, there is a rich mathematical theory studying it's structure and analysing results.

Mathematicians aren't just interested in finding optimal strategy and assigning a solution to a game. They also look to generalise and abstract theories of the gameplay and find ways to evaluate statements in the ontology of the game. Even simple games have rich logical calculi, and there are questions of rule independence and game extensions that can always be asked.

Dynamic Epistemic Logic is one of the general settings in which more advanced theories of game play have been formulated. Whenever two or more people are involved in gameplay, there are important distinctions between belief, knowledge, shared knowledge, and strategy that must be made to fully understand the dynamics. DEL (and a number of related settings) have been used to evaluate many common games, from simple pebble and card games to complicated board games and beyond, as a means to understand the evolution of belief systems and evaluate strategy during the play.

The Dynamic Epistemic Logic of Games

Epistemic Logic and the Foundations of Decision and Game Theory

Selection Monads and the Relation Between Game Theory and Proof Theory

I think the real mathematical answer to your question, then, is every popular game. There's no "most mathematical". Proof theory, models, modal logics, agent calculi and bisimulation lie at the heart of all games.

• How would you start an analysis of the party game Charades? Gerhard "Or Worse Yet, Of Pictionary" Paseman, 2013.01.30 Jan 31, 2013 at 1:57
• @GerhardPaseman: Pattern recognition and the theory of images is hugely mathematical. One of my favorite books to refer to on the subject in college was Monique Pavel's "Fundamentals of Pattern Recognition" which started with the topological theory of images and the group theory of mappings and generalised this to a categorial setting. Once you have object recognition, then you analyse semantic interpretations and similarity mappings to understand the goals. Are you suggesting these are things that can't be mathematically modeled, or that they shouldn't be, or? Jan 31, 2013 at 19:40
• I think my point is that some view games mathematically, for the goal of practicing mathematics. While I understand and often sympathize with such an endeavour, I remind you that some games are for pure social entertainment, and mathematical analysis is often counter to that goal. I would consider a semiotic approach to Charades analysis, and I am not clear what goals your suggested approach are trying to reach. Gerhard "Likes Board Over Party Games" Paseman, 2013.02.01 Feb 2, 2013 at 6:27
• The second link is dead - but the paper by Olivier Roy with the title Epistemic logic and the foundations of decision and game theory can be found in various places online. May 23 at 5:26