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Minimax

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2951:(terminal nodes and nodes at the maximum search depth). Non-leaf nodes inherit their value from a descendant leaf node. The heuristic value is a score measuring the favorability of the node for the maximizing player. Hence nodes resulting in a favorable outcome, such as a win, for the maximizing player have higher scores than nodes more favorable for the minimizing player. The heuristic value for terminal (game ending) leaf nodes are scores corresponding to win, loss, or draw, for the maximizing player. For non terminal leaf nodes at the maximum search depth, an evaluation function estimates a heuristic value for the node. The quality of this estimate and the search depth determine the quality and accuracy of the final minimax result. 3041: 3049: 3149:
Minimax theory has been extended to decisions where there is no other player, but where the consequences of decisions depend on unknown facts. For example, deciding to prospect for minerals entails a cost, which will be wasted if the minerals are not present, but will bring major rewards if they are.
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win in one move, while another move will lead to the situation where player A can, at best, draw, then player B's best move is the one leading to a draw. Late in the game, it's easy to see what the "best" move is. The minimax algorithm helps find the best move, by working backwards from the
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strategy where voters, when faced with two or more candidates, choose the one they perceive as the least harmful or the "lesser evil." To do so, "voting should not be viewed as a form of personal self-expression or moral judgement directed in retaliation towards major party candidates who fail to
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measurements (that outcomes include "how much better or worse"), and returns ordinal data, using only the modeled outcomes: the conclusion of a minimax analysis is: "this strategy is minimax, as the worst case is (outcome), which is less bad than any other strategy". Compare to expected value
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evaluation function which gives values to non-final game states without considering all possible following complete sequences. We can then limit the minimax algorithm to look only at a certain number of moves ahead. This number is called the "look-ahead", measured in
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is the highest value that the player can be sure to get without knowing the actions of the other players; equivalently, it is the lowest value the other players can force the player to receive when they know the player's action. Its formal definition is:
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Calculating the maximin value of a player is done in a worst-case approach: for each possible action of the player, we check all possible actions of the other players and determine the worst possible combination of actions – the one that gives player
2633:"Maximin" is a term commonly used for non-zero-sum games to describe the strategy which maximizes one's own minimum payoff. In non-zero-sum games, this is not generally the same as minimizing the opponent's maximum gain, nor the same as the 3103:
values, and assign it to that same node (e.g. the node on the left will choose the minimum between "10" and "+∞", therefore assigning the value "10" to itself). The next step, in level 2, consists of choosing for each node the
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and it indicates how good it would be for a player to reach that position. The player then makes the move that maximizes the minimum value of the position resulting from the opponent's possible following moves. If it is
1152: 95:, covering both the cases where players take alternate moves and those where they make simultaneous moves, it has also been extended to more complex games and to general decision-making in the presence of uncertainty. 413: 1948: 1875: 3674:. Rawls defined this principle as the rule which states that social and economic inequalities should be arranged so that "they are to be of the greatest benefit to the least-advantaged members of society". 785:
of a player is the smallest value that the other players can force the player to receive, without knowing the player's actions; equivalently, it is the largest value the player can be sure to get when they
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arises because each player minimizes the maximum payoff possible for the other – since the game is zero-sum, they also minimize their own maximum loss (i.e., maximize their minimum payoff). See also
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or repeated positions). The number of nodes to be explored for the analysis of a game is therefore approximately the branching factor raised to the power of the number of plies. It is therefore
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During the 1997 match, the software search extended the search to about 40 plies along the forcing lines, even though the non-extended search reached only about 12 plies.
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An animated pedagogical example that attempts to be human-friendly by substituting initial infinite (or arbitrarily large) values for emptiness and by avoiding using the
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reflect our values, or of a corrupt system designed to limit choices to those acceptable to corporate elites," but rather as an opportunity to reduce harm or loss.
776: 744: 365: 300: 662: 267: 5698: 4183: 4156: 3506: 3124:, where it chooses the move with the largest value (represented in the figure with a blue arrow). This is the move that the player should make in order to 119: 796: 5622: 3896: 5713: 5523: 1358:{\displaystyle {\overline {v_{i}}}=\min _{a_{-i}}\max _{a_{i}}{v_{i}(a_{i},a_{-i})}=\min _{a_{-i}}{\Big (}\max _{a_{i}}{v_{i}(a_{i},a_{-i})}{\Big )}} 3599:
to changes in the assumptions, in contrast to these other decision techniques. Various extensions of this non-probabilistic approach exist, notably
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The definition is very similar to that of the maximin value – only the order of the maximum and minimum operators is inverse. In the above example:
535:{\displaystyle {\begin{array}{c|cc}\hline &L&R\\\hline T&3,1&2,-20\\M&5,0&-10,1\\B&-100,2&4,4\\\hline \end{array}}} 4176: 4135: 5688: 4449: 419: 5348: 2684:
win in one move, their best move is that winning move. If player B knows that one move will lead to the situation where player A
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tries to maximize their value before knowing what the others will do; in minimax the maximization comes before the minimization, so player
1808: 545:(where the first number in each of the cell is the pay-out of the row player and the second number is the pay-out of the column player). 5723: 387:
For example, consider the following game for two players, where the first player ("row player") may choose any of three moves, labelled
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Minimax treats the two players (the maximizing player and the minimizing player) separately in its code. Based on the observation that
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will choose B2; and eventually both players will realize the difficulty of making a choice. So a more stable strategy is needed.
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Suppose the game being played only has a maximum of two possible moves per player each turn. The algorithm generates the
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The performance of the naïve minimax algorithm may be improved dramatically, without affecting the result, by the use of
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is distinct from minimax. Minimax is used in zero-sum games to denote minimizing the opponent's maximum payoff. In a
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of each node (i.e., the average number of legal moves in a position). The number of nodes to be explored usually
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is B2 since the worst possible result is then no payment. However, this solution is not stable, since if
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regardless of Player 2's strategy, and similarly Player 2 can guarantee themselves a payoff of −
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is A2 since the worst possible result is then having to pay 1, while the simple maximin choice for
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A key feature of minimax decision making is being non-probabilistic: in contrast to decisions using
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are assigned with negative infinity. At level 3, the algorithm will choose, for each node, the
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at that time) looked ahead at least 12 plies, then applied a heuristic evaluation function.
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will not choose B3 since some mixtures of B1 and B2 will produce a better result, no matter what
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have been developed, for two-player games in which chance (for example, dice) is a factor.
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on the right, where the circles represent the moves of the player running the algorithm (
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displayed on the table ("Payoff matrix for player A"). Assume the payoff matrix for
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using a heuristic evaluation function, obtaining the values shown. The moves where the
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will not choose A3 since either A1 or A2 will produce a better result, no matter what
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is in a much better position – they maximize their value knowing what the others did.
5677: 5363: 5353: 5308: 5293: 5273: 5099: 5044: 5019: 4891: 4861: 4851: 4838: 4743: 4685: 4620: 4553: 4348: 4303: 4087: 4048: 4002: 3568:{\displaystyle \int _{\Theta }R(\theta ,\delta )\ \operatorname {d} \Pi (\theta )\ .} 3306: 3259: 3133: 2859:
A naïve minimax algorithm may be trivially modified to additionally return an entire
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wins are assigned with positive infinity, while the moves that lead to a win of the
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is the same matrix with the signs reversed (i.e., if the choices are A1 and B1 then
904:{\displaystyle {\overline {v_{i}}}=\min _{a_{-i}}\max _{a_{i}}{v_{i}(a_{i},a_{-i})}} 5338: 5333: 5188: 4763: 4298: 4262: 4232: 4052: 3958: 3891: 2180:(a) Given Player 2's strategy, the best payoff possible for Player 1 is 4168: 4151: 1131:
Intuitively, in maximin the maximization comes after the minimization, so player
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can take in order to make sure that this smallest value is the highest possible.
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the payoff vector resulting from both players playing their minimax strategies,
92: 61: 5084: 4738: 4242: 3982: 3660: 3099: 2948: 2872: 2834: 2187:(b) Given Player 1's strategy, the best payoff possible for Player 2 is − 407:. The result of the combination of both moves is expressed in a payoff table: 69: 65: 27:
Decision rule used for minimizing the possible loss for a worst case scenario
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the chances of A winning (i.e., to maximize B's own chances of winning).
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end of the game. At each step it assumes that player A is trying to
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chooses, by using a randomized strategy of choosing B1 with probability
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Minimax thus can be used on ordinal data, and can be more transparent.
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to completely analyze games such as chess using the minimax algorithm.
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the chances of A winning, while on the next turn player B is trying to
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This article is about the decision theory concept. For other uses, see
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of any other move is the maximum of the values resulting from each of
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A possible allocation method consists in assigning a certain win for
1943:{\displaystyle \ {\underline {v_{col}}}\leq {\overline {v_{col}}}\,,} 4071: 4026: 3929:
Hsu, Feng-Hsiung (1999). "IBM's Deep Blue chess grandmaster chips".
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An alternative criterion in the decision theoretic framework is the
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with the number of plies (it is less than exponential if evaluating
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value := max(value, minimax(child, depth − 1, FALSE))
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Equivalently, Player 1's strategy guarantees them a payoff of
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In philosophy, the term "maximin" is often used in the context of
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value := min(value, minimax(child, depth − 1, TRUE))
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solutions. Suppose each player has three choices and consider the
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analysis, whose conclusion is of the form: "This strategy yields
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resulting from both players playing their maximin strategy.
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the actions of the other players. Its formal definition is:
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the smallest value. Then, we determine which action player
3937:(2). Los Alamitos, CA, USA: IEEE Computer Society: 70–81. 2614:
minimax strategies cannot be improved and are now stable.
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can avoid having to make an expected payment of more than
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game with finitely many strategies, there exists a value
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If both players play their respective maximin strategies
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for the depth-limited minimax algorithm is given below.
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The minimax values are very important in the theory of
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cannot similarly be ranked against the payoff vector
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values. Once again, the values are assigned to each
3068:), and squares represent the moves of the opponent ( 5560: 5539: 5433: 5392: 5174: 5118: 4900: 4802: 4709: 4567: 4466: 4291: 4210: 2947:The minimax function returns a heuristic value for 2665:, there is a minimax algorithm for game solutions. 3567: 3486: 3450: 3336: 3297: 3250: 3212: 3020: 2809:(the first one to beat a reigning world champion, 2649:. One of the central theorems in this theory, the 2133: 2095: 2056: 2021: 1983: 1942: 1869: 1794: 1756: 1715: 1659: 1627: 1592: 1533: 1501: 1460: 1425: 1357: 1120: 1056: 978: 903: 770: 738: 702: 656: 618: 534: 359: 330: 294: 261: 226: 3963:An Eight Point Brief for LEV (Lesser Evil Voting) 2816:The algorithm can be thought of as exploring the 1350: 1282: 3412: 3399: 3359: 3177:Minimax criterion in statistical decision theory 3150:One approach is to treat this as a game against 2988: 2964: 2285:The following example of a zero-sum game, where 2176:and a mixed strategy for each player, such that 1288: 1261: 1197: 1177: 1146:is by reading from right to left: When we write 841: 821: 161: 144: 1802:over these outcomes. (Conversely for maximin.) 338:denotes the actions taken by all other players. 4007:"Some ordinalist-utilitarian notes on Rawls's 3595:of what the possible outcomes are. It is thus 5517: 4443: 4184: 988:The column player can get a maximum value of 560:, which guarantees them a payoff of at least 8: 4157:Dictionary of Algorithms and Data Structures 3866:(print ed.). Cambridge, MA: MIT Press. 3670:where he refers to it in the context of The 3646:" voting (LEV) can be seen as a form of the 3614:(that outcomes be compared and ranked), not 2730:gives a value to each of their legal moves. 4140:Dictionary of Philosophical Terms and Names 3021:{\displaystyle \ \max(a,b)=-\min(-a,-b)\ ,} 5623:Heuristics in judgment and decision-making 5524: 5510: 5502: 4450: 4436: 4428: 4191: 4177: 4169: 3897:Artificial Intelligence: A Modern Approach 3494:An estimator is Bayes if it minimizes the 2713:for choosing the next move in an n-player 2153:, the minimax solution is the same as the 1057:{\displaystyle {\overline {v_{col}}}=1\ .} 979:{\displaystyle {\overline {v_{row}}}=4\ .} 918:The row player can get a maximum value of 548:For the sake of example, we consider only 3820: 3818: 3514: 3508: 3473: 3415: 3402: 3381: 3380: 3362: 3356: 3320: 3319: 3314: 3266: 3228: 3199: 3028:minimax may often be simplified into the 2959: 2676:, stated below, deals with games such as 2108: 2089: 2069: 2034: 1996: 1955: 1936: 1919: 1913: 1893: 1887: 1882: 1847: 1841: 1821: 1815: 1810: 1779: 1774: 1769: 1738: 1733: 1728: 1709: 1697: 1681: 1672: 1647: 1642: 1640: 1615: 1610: 1605: 1578: 1565: 1552: 1546: 1524: 1519: 1517: 1483: 1478: 1473: 1448: 1443: 1438: 1408: 1395: 1382: 1373: 1349: 1348: 1335: 1322: 1309: 1304: 1296: 1291: 1281: 1280: 1269: 1264: 1244: 1231: 1218: 1213: 1205: 1200: 1185: 1180: 1162: 1156: 1154: 1107: 1101: 1087: 1081: 1079: 1025: 1019: 1017: 947: 941: 939: 888: 875: 862: 857: 849: 844: 829: 824: 806: 800: 798: 751: 719: 677: 671: 669: 646: 593: 587: 585: 418: 417: 415: 351: 345: 319: 313: 286: 280: 251: 211: 198: 185: 180: 169: 164: 152: 147: 129: 123: 121: 3047: 3039: 2796:This can be extended if we can supply a 2558:can ensure an expected gain of at least 2349:will choose A1 to gain 3; and then 2219: 703:{\displaystyle {\underline {v_{col}}}=0} 619:{\displaystyle {\underline {v_{row}}}=2} 269:denotes all other players except player 3786:(Report). Fraser Institute. p. 25. 3771: 3305:usually specified as the integral of a 3298:{\displaystyle \ R(\theta ,\delta )\ .} 3251:{\displaystyle \ \theta \in \Theta \ .} 2881:minimax(node, depth, maximizingPlayer) 2337:will choose B1 to gain 1; then if 1426:{\displaystyle \ v_{i}(a_{i},a_{-i})\ } 244:is the index of the player of interest. 3337:{\displaystyle \ {\tilde {\delta }}\ } 2765:'s possible replies. For this reason, 2701:Minimax algorithm with alternate moves 2160:In the context of zero-sum games, the 1667:) to yield a set of marginal outcomes 1071:, the maximin is at most the minimax: 2833:of the tree is the average number of 2293:make simultaneous moves, illustrates 568:is risky since it can lead to payoff 7: 1805:Although it is always the case that 5699:Optimization algorithms and methods 2805:". For example, the chess computer 1716:{\displaystyle \ v'_{i}(a_{-i})\,,} 1593:{\displaystyle v_{i}(a_{i},a_{-i})} 4499:First-player and second-player win 3547: 3541: 3515: 3475: 3239: 3158:), and using a similar mindset as 3145:Minimax in the face of uncertainty 2757:, negative infinity. The value to 25: 4060:American Political Science Review 3579:Non-probabilistic decision theory 2360:by others and can be eliminated: 2220: 2210:example of a game without a value 641:puts them in the risk of getting 5714:Theorems in discrete mathematics 4606:Coalition-proof Nash equilibrium 3781:Provincial Healthcare Index 2013 3140:Minimax for individual decisions 2899:the heuristic value of node 2653:, relies on the minimax values. 2399:by choosing A1 with probability 2317:). Then, the maximin choice for 633:and secure a payoff of at least 367:is the value function of player 3779:Bacchus, Barua (January 2013). 3610:Further, minimax only requires 4616:Evolutionarily stable strategy 3556: 3550: 3535: 3523: 3439: 3427: 3392: 3386: 3371: 3325: 3286: 3274: 3009: 2991: 2979: 2967: 2125: 2113: 2086: 2074: 2051: 2036: 2013: 2001: 1975: 1960: 1706: 1690: 1587: 1558: 1417: 1388: 1344: 1315: 1253: 1224: 1142:Another way to understand the 897: 868: 765: 753: 733: 721: 302:is the action taken by player 220: 191: 1: 4544:Simultaneous action selection 3710:Lesser of two evils principle 3079:The algorithm evaluates each 2944:minimax(origin, depth, TRUE) 1757:{\displaystyle \ {a_{-i}}\ .} 1635:(for every possible value of 1502:{\displaystyle \ {a_{-i}}\ .} 552:. Check each player in turn: 52:) is a decision rule used in 5689:Game artificial intelligence 5476:List of games in game theory 4656:Quantal response equilibrium 4646:Perfect Bayesian equilibrium 4581:Bayes correlated equilibrium 2863:along with a minimax score. 2719:position evaluation function 2622:Frequently, in game theory, 1931: 1859: 1795:{\displaystyle \ {a_{-i}}\ } 1368:the initial set of outcomes 1168: 1113: 1037: 959: 812: 5547:Expected utility hypothesis 4945:Optional prisoner's dilemma 4676:Self-confirming equilibrium 4110:Encyclopedia of Mathematics 3800:Turing and von Neumann 3220:that is used to estimate a 3213:{\displaystyle \ \delta \ } 2221:Payoff matrix for player A 1984:{\displaystyle \ (2,-20)\ } 1628:{\displaystyle \ {a_{i}}\ } 1461:{\displaystyle \ {a_{i}}\ } 992:(if the other player plays 930:(if the other player plays 922:(if the other player plays 629:The column player can play 5740: 5724:Fixed points (mathematics) 5663:Evidential decision theory 5410:Principal variation search 5126:Aumann's agreement theorem 4789:Strategy-stealing argument 4701:Trembling hand equilibrium 4631:Markov perfect equilibrium 4626:Mertens-stable equilibrium 3835:Cambridge University Press 3180: 2096:{\displaystyle \ (M,R)\,,} 576:can result in a payoff of 29: 5598:Principle of indifference 5446:Combinatorial game theory 5105:Princess and monster game 4661:Quasi-perfect equilibrium 4586:Bayesian Nash equilibrium 4407: 3797:Professor Raymond Flood. 3187:In classical statistical 2926:value := +∞ 2907:value := −∞ 2743:combinatorial game theory 2663:combinatorial game theory 2657:Combinatorial game theory 2134:{\displaystyle \ (3,1)\ } 2022:{\displaystyle \ (T,R)\ } 5461:Evolutionary game theory 5194:Antoine Augustin Cournot 5080:Guess 2/3 of the average 4877:Strictly determined game 4671:Satisfaction equilibrium 4489:Escalation of commitment 4131:— A visualization applet 3829:; Zamir, Shmuel (2013). 3605:Info-gap decision theory 2892:node is a terminal node 2594:and B2 with probability 2434:The expected payoff for 2415:and A2 with probability 1660:{\displaystyle {a_{-i}}} 556:The row player can play 32:Minimax (disambiguation) 5658:Emotional choice theory 5466:Glossary of game theory 5065:Stackelberg competition 4691:Strong Nash equilibrium 4412:List of data structures 3864:A Course in Game Theory 3760:Gamma-minimax inference 3725:Monte Carlo tree search 3487:{\displaystyle \Pi \ .} 3056:coding simplifications. 2924:(* minimizing player *) 2839:increases exponentially 2672:version of the minimax 2057:{\displaystyle (-10,1)} 1534:{\displaystyle {a_{i}}} 746:, the payoff vector is 54:artificial intelligence 5653:Causal decision theory 5618:St. Petersburg paradox 5568:Decision-matrix method 5491:Tragedy of the commons 5471:List of game theorists 5451:Confrontation analysis 5161:Sprague–Grundy theorem 4681:Sequential equilibrium 4601:Correlated equilibrium 3740:Sion's minimax theorem 3569: 3488: 3452: 3338: 3299: 3252: 3214: 3057: 3045: 3044:A minimax tree example 3022: 2194: 2135: 2097: 2058: 2023: 1985: 1944: 1871: 1796: 1764:We then minimize over 1758: 1723:which depends only on 1717: 1661: 1629: 1594: 1535: 1503: 1462: 1427: 1359: 1122: 1058: 980: 905: 772: 740: 704: 658: 620: 536: 361: 332: 331:{\displaystyle a_{-i}} 296: 263: 228: 5633:Bayesian epistemology 5264:Jean-François Mertens 4015:Journal of Philosophy 3655:Maximin in philosophy 3570: 3489: 3465:in the presence of a 3453: 3339: 3309:. In this framework, 3300: 3253: 3215: 3051: 3043: 3023: 2741:as −1. This leads to 2554:chose B2. Similarly, 2168:For every two-person 2166: 2136: 2098: 2059: 2024: 1986: 1945: 1872: 1797: 1759: 1718: 1662: 1630: 1600:, by maximizing over 1595: 1536: 1504: 1463: 1428: 1360: 1123: 1059: 981: 906: 773: 771:{\displaystyle (3,1)} 741: 739:{\displaystyle (T,L)} 705: 659: 621: 537: 362: 360:{\displaystyle v_{i}} 333: 297: 295:{\displaystyle a_{i}} 264: 229: 5648:Social choice theory 5552:Intertemporal choice 5393:Search optimizations 5269:Jennifer Tour Chayes 5156:Revelation principle 5151:Purification theorem 5090:Nash bargaining game 5055:Bertrand competition 5040:El Farol Bar problem 5005:Electronic mail game 4970:Lewis signaling game 4514:Hierarchy of beliefs 4309:Breadth-first search 4129:. Curriculum: Games. 3858:Osborne, Martin J.; 3837:. pp. 176–180. 3755:Wald's maximin model 3672:Difference Principle 3507: 3472: 3355: 3313: 3265: 3227: 3198: 3171:expectiminimax trees 2958: 2345:will choose B1 then 2333:will choose A2 then 2107: 2068: 2033: 1995: 1954: 1881: 1809: 1768: 1727: 1671: 1639: 1604: 1545: 1516: 1472: 1437: 1372: 1153: 1078: 1016: 938: 797: 750: 718: 668: 645: 584: 530: 414: 344: 312: 279: 250: 120: 5583:Strategic dominance 5441:Bounded rationality 5060:Cournot competition 5010:Rock paper scissors 4985:Battle of the sexes 4975:Volunteer's dilemma 4847:Perfect information 4774:Dominant strategies 4611:Epsilon-equilibrium 4494:Extensive-form game 4399:Topological sorting 4329:Dynamic programming 4136:"Maximin principle" 4105:"Minimax principle" 3988:A Theory of Justice 3825:Maschler, Michael; 3750:Transposition table 3666:A Theory of Justice 3638:Minimax in politics 3612:ordinal measurement 2861:Principal Variation 2222: 1689: 657:{\displaystyle -20} 86:imum loss) scenario 5628:Probability theory 5420:Paranoid algorithm 5400:Alpha–beta pruning 5279:John Maynard Smith 5110:Rendezvous problem 4950:Traveler's dilemma 4940:Gift-exchange game 4935:Prisoner's dilemma 4852:Large Poisson game 4819:Bargaining problem 4724:Backward induction 4696:Subgame perfection 4651:Proper equilibrium 4417:List of algorithms 4324:Divide and conquer 4319:Depth-first search 4314:Brute-force search 4228:Binary search tree 4123:"Mixed strategies" 3888:Russell, Stuart J. 3685:Alpha–beta pruning 3565: 3484: 3467:prior distribution 3448: 3420: 3407: 3367: 3334: 3295: 3248: 3210: 3058: 3046: 3018: 2942:(* Initial call *) 2854:alpha–beta pruning 2164:is equivalent to: 2131: 2093: 2054: 2019: 1981: 1940: 1908: 1867: 1836: 1792: 1754: 1713: 1677: 1657: 1625: 1590: 1531: 1499: 1458: 1423: 1355: 1303: 1279: 1212: 1195: 1118: 1096: 1054: 976: 901: 856: 839: 768: 736: 700: 692: 654: 616: 608: 532: 529: 357: 328: 292: 262:{\displaystyle -i} 259: 224: 179: 159: 138: 5704:Search algorithms 5671: 5670: 5499: 5498: 5405:Aspiration window 5374:Suzanne Scotchmer 5329:Oskar Morgenstern 5224:Donald B. Gillies 5166:Zermelo's theorem 5095:Induction puzzles 5050:Fair cake-cutting 5025:Public goods game 4955:Coordination game 4829:Intransitive game 4759:Forward induction 4641:Pareto efficiency 4621:Gibbs equilibrium 4591:Berge equilibrium 4539:Simultaneous game 4425: 4424: 4223:Associative array 4009:Theory of Justice 3961:and John Halle, " 3943:10.1109/40.755469 3715:Minimax Condorcet 3593:scenario analysis 3561: 3540: 3480: 3444: 3423: 3411: 3410: 3398: 3389: 3358: 3333: 3328: 3318: 3291: 3270: 3258:We also assume a 3244: 3232: 3209: 3203: 3183:Minimax estimator 3091:minimizing player 3087:maximizing player 3076:of 4 moves. 3070:minimizing player 3066:maximizing player 3014: 2963: 2903:maximizingPlayer 2783:minimax algorithm 2781:, hence the name 2779:minimizing player 2771:maximizing player 2726:'s turn to move, 2707:minimax algorithm 2641:In repeated games 2574:, no matter what 2356:Some choices are 2283: 2282: 2145:In zero-sum games 2130: 2112: 2073: 2018: 2000: 1980: 1959: 1934: 1888: 1886: 1866: 1862: 1816: 1814: 1791: 1773: 1750: 1732: 1676: 1624: 1609: 1495: 1477: 1457: 1442: 1422: 1377: 1287: 1260: 1196: 1176: 1171: 1116: 1082: 1067:For every player 1050: 1040: 972: 962: 840: 820: 815: 672: 588: 160: 143: 124: 18:Minimax algorithm 16:(Redirected from 5731: 5694:Graph algorithms 5684:Detection theory 5613:Ellsberg paradox 5578:Expected utility 5526: 5519: 5512: 5503: 5486:Topological game 5481:No-win situation 5379:Thomas Schelling 5359:Robert B. Wilson 5319:Merrill M. Flood 5289:John von Neumann 5199:Ariel Rubinstein 5184:Albert W. Tucker 5035:War of attrition 4995:Matching pennies 4636:Nash equilibrium 4559:Mechanism design 4524:Normal-form game 4479:Cooperative game 4452: 4445: 4438: 4429: 4394:String-searching 4193: 4186: 4179: 4170: 4165: 4147: 4142:. Archived from 4130: 4127:cut-the-knot.org 4118: 4092: 4091: 4057: 4045: 4039: 4038: 3999: 3993: 3992: 3979: 3973: 3956: 3950: 3949: 3926: 3920: 3919: 3884: 3878: 3877: 3855: 3849: 3848: 3822: 3813: 3812: 3794: 3788: 3787: 3785: 3776: 3642:The concept of " 3633: 3631: 3627: 3623: 3589:expected utility 3574: 3572: 3571: 3566: 3559: 3538: 3519: 3518: 3493: 3491: 3490: 3485: 3478: 3457: 3455: 3454: 3449: 3442: 3421: 3419: 3408: 3406: 3391: 3390: 3382: 3366: 3348:if it satisfies 3343: 3341: 3340: 3335: 3331: 3330: 3329: 3321: 3316: 3304: 3302: 3301: 3296: 3289: 3268: 3257: 3255: 3254: 3249: 3242: 3230: 3219: 3217: 3216: 3211: 3207: 3201: 3027: 3025: 3024: 3019: 3012: 2961: 2830:branching factor 2745:as developed by 2635:Nash equilibrium 2609: 2607: 2606: 2603: 2600: 2593: 2591: 2590: 2587: 2584: 2573: 2571: 2570: 2567: 2564: 2549: 2548: 2546: 2545: 2542: 2539: 2535: 2529: 2527: 2526: 2523: 2520: 2513: 2511: 2510: 2507: 2504: 2491: 2490: 2488: 2487: 2484: 2481: 2477: 2471: 2469: 2468: 2465: 2462: 2455: 2453: 2452: 2449: 2446: 2433: 2431: 2429: 2428: 2425: 2422: 2414: 2412: 2411: 2408: 2405: 2398: 2396: 2395: 2392: 2389: 2261: 2223: 2203: 2199: 2190: 2183: 2175: 2155:Nash equilibrium 2140: 2138: 2137: 2132: 2128: 2110: 2102: 2100: 2099: 2094: 2071: 2063: 2061: 2060: 2055: 2028: 2026: 2025: 2020: 2016: 1998: 1990: 1988: 1987: 1982: 1978: 1957: 1949: 1947: 1946: 1941: 1935: 1930: 1929: 1914: 1909: 1904: 1903: 1884: 1876: 1874: 1873: 1868: 1864: 1863: 1858: 1857: 1842: 1837: 1832: 1831: 1812: 1801: 1799: 1798: 1793: 1789: 1788: 1787: 1786: 1771: 1763: 1761: 1760: 1755: 1748: 1747: 1746: 1745: 1730: 1722: 1720: 1719: 1714: 1705: 1704: 1685: 1674: 1666: 1664: 1663: 1658: 1656: 1655: 1654: 1634: 1632: 1631: 1626: 1622: 1621: 1620: 1619: 1607: 1599: 1597: 1596: 1591: 1586: 1585: 1570: 1569: 1557: 1556: 1540: 1538: 1537: 1532: 1530: 1529: 1528: 1511:marginalize away 1508: 1506: 1505: 1500: 1493: 1492: 1491: 1490: 1475: 1467: 1465: 1464: 1459: 1455: 1454: 1453: 1452: 1440: 1433:depends on both 1432: 1430: 1429: 1424: 1420: 1416: 1415: 1400: 1399: 1387: 1386: 1375: 1364: 1362: 1361: 1356: 1354: 1353: 1347: 1343: 1342: 1327: 1326: 1314: 1313: 1302: 1301: 1300: 1286: 1285: 1278: 1277: 1276: 1256: 1252: 1251: 1236: 1235: 1223: 1222: 1211: 1210: 1209: 1194: 1193: 1192: 1172: 1167: 1166: 1157: 1138: 1134: 1127: 1125: 1124: 1119: 1117: 1112: 1111: 1102: 1097: 1092: 1091: 1070: 1063: 1061: 1060: 1055: 1048: 1041: 1036: 1035: 1020: 1011: 1007: 1003: 999: 995: 991: 985: 983: 982: 977: 970: 963: 958: 957: 942: 933: 929: 925: 921: 910: 908: 907: 902: 900: 896: 895: 880: 879: 867: 866: 855: 854: 853: 838: 837: 836: 816: 811: 810: 801: 777: 775: 774: 769: 745: 743: 742: 737: 709: 707: 706: 701: 693: 688: 687: 663: 661: 660: 655: 640: 636: 632: 625: 623: 622: 617: 609: 604: 603: 579: 575: 571: 567: 563: 559: 541: 539: 538: 533: 531: 421: 406: 402: 398: 394: 390: 383: 379: 370: 366: 364: 363: 358: 356: 355: 337: 335: 334: 329: 327: 326: 305: 301: 299: 298: 293: 291: 290: 272: 268: 266: 265: 260: 243: 233: 231: 230: 225: 223: 219: 218: 203: 202: 190: 189: 178: 177: 176: 158: 157: 156: 139: 134: 133: 104:In general games 21: 5739: 5738: 5734: 5733: 5732: 5730: 5729: 5728: 5719:Decision theory 5674: 5673: 5672: 5667: 5573:Decision matrix 5556: 5535: 5533:Decision theory 5530: 5500: 5495: 5429: 5415:max^n algorithm 5388: 5384:William Vickrey 5344:Reinhard Selten 5299:Kenneth Binmore 5214:David K. Levine 5209:Daniel Kahneman 5176: 5170: 5146:Negamax theorem 5136:Minimax theorem 5114: 5075:Diner's dilemma 4930:All-pay auction 4896: 4882:Stochastic game 4834:Mean-field game 4805: 4798: 4769:Markov strategy 4705: 4571: 4563: 4534:Sequential game 4519:Information set 4504:Game complexity 4474:Congestion game 4462: 4456: 4426: 4421: 4403: 4334:Graph traversal 4287: 4211:Data structures 4206: 4200:Data structures 4197: 4150: 4134: 4121: 4103: 4100: 4095: 4072:10.2307/1959090 4055: 4047: 4046: 4042: 4027:10.2307/2025006 4001: 4000: 3996: 3981: 3980: 3976: 3957: 3953: 3928: 3927: 3923: 3908: 3886: 3885: 3881: 3874: 3857: 3856: 3852: 3845: 3824: 3823: 3816: 3805:Gresham College 3796: 3795: 3791: 3783: 3778: 3777: 3773: 3769: 3764: 3680: 3657: 3640: 3629: 3625: 3621: 3620: 3581: 3510: 3505: 3504: 3470: 3469: 3463:Bayes estimator 3353: 3352: 3311: 3310: 3263: 3262: 3225: 3224: 3196: 3195: 3189:decision theory 3185: 3179: 3164:resistentialism 3147: 3142: 3038: 2956: 2955: 2945: 2939: 2869: 2709:is a recursive 2703: 2659: 2643: 2620: 2604: 2601: 2598: 2597: 2595: 2588: 2585: 2582: 2581: 2579: 2568: 2565: 2562: 2561: 2559: 2543: 2540: 2537: 2536: 2533: 2531: 2524: 2521: 2518: 2517: 2515: 2508: 2505: 2502: 2501: 2499: 2497: 2485: 2482: 2479: 2478: 2475: 2473: 2466: 2463: 2460: 2459: 2457: 2450: 2447: 2444: 2443: 2441: 2439: 2426: 2423: 2420: 2419: 2417: 2416: 2409: 2406: 2403: 2402: 2400: 2393: 2390: 2387: 2386: 2384: 2313:pays 3 to 2259: 2218: 2201: 2197: 2188: 2181: 2173: 2162:minimax theorem 2147: 2105: 2104: 2066: 2065: 2064:in the case of 2031: 2030: 1993: 1992: 1991:in the case of 1952: 1951: 1915: 1889: 1879: 1878: 1843: 1817: 1807: 1806: 1775: 1766: 1765: 1734: 1725: 1724: 1693: 1669: 1668: 1643: 1637: 1636: 1611: 1602: 1601: 1574: 1561: 1548: 1543: 1542: 1520: 1514: 1513: 1479: 1470: 1469: 1444: 1435: 1434: 1404: 1391: 1378: 1370: 1369: 1331: 1318: 1305: 1292: 1265: 1240: 1227: 1214: 1201: 1181: 1158: 1151: 1150: 1136: 1132: 1103: 1083: 1076: 1075: 1068: 1021: 1014: 1013: 1009: 1005: 1001: 997: 993: 989: 943: 936: 935: 931: 927: 923: 919: 884: 871: 858: 845: 825: 802: 795: 794: 748: 747: 716: 715: 673: 666: 665: 643: 642: 638: 634: 630: 589: 582: 581: 577: 573: 569: 565: 561: 557: 550:pure strategies 528: 527: 516: 502: 496: 495: 481: 470: 464: 463: 449: 438: 432: 431: 426: 412: 411: 404: 400: 396: 392: 388: 381: 377: 368: 347: 342: 341: 315: 310: 309: 303: 282: 277: 276: 270: 248: 247: 241: 207: 194: 181: 165: 148: 125: 118: 117: 106: 101: 58:decision theory 35: 28: 23: 22: 15: 12: 11: 5: 5737: 5735: 5727: 5726: 5721: 5716: 5711: 5706: 5701: 5696: 5691: 5686: 5676: 5675: 5669: 5668: 5666: 5665: 5660: 5655: 5650: 5645: 5640: 5635: 5630: 5625: 5620: 5615: 5610: 5608:Allais paradox 5605: 5600: 5595: 5590: 5585: 5580: 5575: 5570: 5564: 5562: 5558: 5557: 5555: 5554: 5549: 5543: 5541: 5537: 5536: 5531: 5529: 5528: 5521: 5514: 5506: 5497: 5496: 5494: 5493: 5488: 5483: 5478: 5473: 5468: 5463: 5458: 5453: 5448: 5443: 5437: 5435: 5431: 5430: 5428: 5427: 5422: 5417: 5412: 5407: 5402: 5396: 5394: 5390: 5389: 5387: 5386: 5381: 5376: 5371: 5366: 5361: 5356: 5351: 5349:Robert Axelrod 5346: 5341: 5336: 5331: 5326: 5324:Olga Bondareva 5321: 5316: 5314:Melvin Dresher 5311: 5306: 5304:Leonid Hurwicz 5301: 5296: 5291: 5286: 5281: 5276: 5271: 5266: 5261: 5256: 5251: 5246: 5241: 5239:Harold W. Kuhn 5236: 5231: 5229:Drew Fudenberg 5226: 5221: 5219:David M. Kreps 5216: 5211: 5206: 5204:Claude Shannon 5201: 5196: 5191: 5186: 5180: 5178: 5172: 5171: 5169: 5168: 5163: 5158: 5153: 5148: 5143: 5141:Nash's theorem 5138: 5133: 5128: 5122: 5120: 5116: 5115: 5113: 5112: 5107: 5102: 5097: 5092: 5087: 5082: 5077: 5072: 5067: 5062: 5057: 5052: 5047: 5042: 5037: 5032: 5027: 5022: 5017: 5012: 5007: 5002: 5000:Ultimatum game 4997: 4992: 4987: 4982: 4980:Dollar auction 4977: 4972: 4967: 4965:Centipede game 4962: 4957: 4952: 4947: 4942: 4937: 4932: 4927: 4922: 4920:Infinite chess 4917: 4912: 4906: 4904: 4898: 4897: 4895: 4894: 4889: 4887:Symmetric game 4884: 4879: 4874: 4872:Signaling game 4869: 4867:Screening game 4864: 4859: 4857:Potential game 4854: 4849: 4844: 4836: 4831: 4826: 4821: 4816: 4810: 4808: 4800: 4799: 4797: 4796: 4791: 4786: 4784:Mixed strategy 4781: 4776: 4771: 4766: 4761: 4756: 4751: 4746: 4741: 4736: 4731: 4726: 4721: 4715: 4713: 4707: 4706: 4704: 4703: 4698: 4693: 4688: 4683: 4678: 4673: 4668: 4666:Risk dominance 4663: 4658: 4653: 4648: 4643: 4638: 4633: 4628: 4623: 4618: 4613: 4608: 4603: 4598: 4593: 4588: 4583: 4577: 4575: 4565: 4564: 4562: 4561: 4556: 4551: 4546: 4541: 4536: 4531: 4526: 4521: 4516: 4511: 4509:Graphical game 4506: 4501: 4496: 4491: 4486: 4481: 4476: 4470: 4468: 4464: 4463: 4457: 4455: 4454: 4447: 4440: 4432: 4423: 4422: 4420: 4419: 4414: 4408: 4405: 4404: 4402: 4401: 4396: 4391: 4386: 4381: 4376: 4371: 4366: 4361: 4356: 4351: 4346: 4341: 4336: 4331: 4326: 4321: 4316: 4311: 4306: 4301: 4295: 4293: 4289: 4288: 4286: 4285: 4280: 4275: 4270: 4265: 4260: 4255: 4250: 4245: 4240: 4235: 4230: 4225: 4220: 4214: 4212: 4208: 4207: 4198: 4196: 4195: 4188: 4181: 4173: 4167: 4166: 4148: 4146:on 2006-03-07. 4132: 4119: 4099: 4098:External links 4096: 4094: 4093: 4066:(2): 594–606. 4040: 4021:(9): 245–263. 3994: 3991:. p. 152. 3974: 3972:June 15, 2016. 3951: 3921: 3906: 3892:Norvig, Peter. 3879: 3872: 3860:Rubinstein, A. 3850: 3843: 3814: 3789: 3770: 3768: 3765: 3763: 3762: 3757: 3752: 3747: 3742: 3737: 3732: 3727: 3722: 3720:Minimax regret 3717: 3712: 3707: 3705:Horizon effect 3702: 3700:Computer chess 3697: 3695:Maxn algorithm 3692: 3690:Expectiminimax 3687: 3681: 3679: 3676: 3656: 3653: 3639: 3636: 3601:minimax regret 3585:expected value 3580: 3577: 3576: 3575: 3564: 3558: 3555: 3552: 3549: 3546: 3543: 3537: 3534: 3531: 3528: 3525: 3522: 3517: 3513: 3483: 3477: 3459: 3458: 3447: 3441: 3438: 3435: 3432: 3429: 3426: 3418: 3414: 3405: 3401: 3397: 3394: 3388: 3385: 3379: 3376: 3373: 3370: 3365: 3361: 3327: 3324: 3294: 3288: 3285: 3282: 3279: 3276: 3273: 3247: 3241: 3238: 3235: 3206: 3181:Main article: 3178: 3175: 3156:move by nature 3146: 3143: 3141: 3138: 3037: 3034: 3017: 3011: 3008: 3005: 3002: 2999: 2996: 2993: 2990: 2987: 2984: 2981: 2978: 2975: 2972: 2969: 2966: 2940: 2930:child of node 2911:child of node 2877: 2868: 2865: 2811:Garry Kasparov 2777:is called the 2769:is called the 2747:John H. Conway 2737:as +1 and for 2702: 2699: 2658: 2655: 2647:repeated games 2642: 2639: 2619: 2616: 2281: 2280: 2277: 2274: 2271: 2267: 2266: 2263: 2257: 2254: 2250: 2249: 2246: 2243: 2240: 2236: 2235: 2232: 2229: 2226: 2217: 2214: 2193: 2192: 2185: 2151:zero-sum games 2149:In two-player 2146: 2143: 2127: 2124: 2121: 2118: 2115: 2092: 2088: 2085: 2082: 2079: 2076: 2053: 2050: 2047: 2044: 2041: 2038: 2015: 2012: 2009: 2006: 2003: 1977: 1974: 1971: 1968: 1965: 1962: 1939: 1933: 1928: 1925: 1922: 1918: 1912: 1907: 1902: 1899: 1896: 1892: 1861: 1856: 1853: 1850: 1846: 1840: 1835: 1830: 1827: 1824: 1820: 1785: 1782: 1778: 1753: 1744: 1741: 1737: 1712: 1708: 1703: 1700: 1696: 1692: 1688: 1684: 1680: 1653: 1650: 1646: 1618: 1614: 1589: 1584: 1581: 1577: 1573: 1568: 1564: 1560: 1555: 1551: 1527: 1523: 1498: 1489: 1486: 1482: 1451: 1447: 1419: 1414: 1411: 1407: 1403: 1398: 1394: 1390: 1385: 1381: 1366: 1365: 1352: 1346: 1341: 1338: 1334: 1330: 1325: 1321: 1317: 1312: 1308: 1299: 1295: 1290: 1284: 1275: 1272: 1268: 1263: 1259: 1255: 1250: 1247: 1243: 1239: 1234: 1230: 1226: 1221: 1217: 1208: 1204: 1199: 1191: 1188: 1184: 1179: 1175: 1170: 1165: 1161: 1129: 1128: 1115: 1110: 1106: 1100: 1095: 1090: 1086: 1065: 1064: 1053: 1047: 1044: 1039: 1034: 1031: 1028: 1024: 986: 975: 969: 966: 961: 956: 953: 950: 946: 912: 911: 899: 894: 891: 887: 883: 878: 874: 870: 865: 861: 852: 848: 843: 835: 832: 828: 823: 819: 814: 809: 805: 767: 764: 761: 758: 755: 735: 732: 729: 726: 723: 712: 711: 699: 696: 691: 686: 683: 680: 676: 653: 650: 627: 615: 612: 607: 602: 599: 596: 592: 572:, and playing 543: 542: 526: 523: 520: 517: 515: 512: 509: 506: 503: 501: 498: 497: 494: 491: 488: 485: 482: 480: 477: 474: 471: 469: 466: 465: 462: 459: 456: 453: 450: 448: 445: 442: 439: 437: 434: 433: 430: 427: 425: 422: 420: 373: 372: 354: 350: 339: 325: 322: 318: 307: 289: 285: 274: 258: 255: 245: 235: 234: 222: 217: 214: 210: 206: 201: 197: 193: 188: 184: 175: 172: 168: 163: 155: 151: 146: 142: 137: 132: 128: 105: 102: 100: 97: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 5736: 5725: 5722: 5720: 5717: 5715: 5712: 5710: 5707: 5705: 5702: 5700: 5697: 5695: 5692: 5690: 5687: 5685: 5682: 5681: 5679: 5664: 5661: 5659: 5656: 5654: 5651: 5649: 5646: 5644: 5641: 5639: 5638:Risk aversion 5636: 5634: 5631: 5629: 5626: 5624: 5621: 5619: 5616: 5614: 5611: 5609: 5606: 5604: 5601: 5599: 5596: 5594: 5591: 5589: 5586: 5584: 5581: 5579: 5576: 5574: 5571: 5569: 5566: 5565: 5563: 5559: 5553: 5550: 5548: 5545: 5544: 5542: 5538: 5534: 5527: 5522: 5520: 5515: 5513: 5508: 5507: 5504: 5492: 5489: 5487: 5484: 5482: 5479: 5477: 5474: 5472: 5469: 5467: 5464: 5462: 5459: 5457: 5454: 5452: 5449: 5447: 5444: 5442: 5439: 5438: 5436: 5434:Miscellaneous 5432: 5426: 5423: 5421: 5418: 5416: 5413: 5411: 5408: 5406: 5403: 5401: 5398: 5397: 5395: 5391: 5385: 5382: 5380: 5377: 5375: 5372: 5370: 5369:Samuel Bowles 5367: 5365: 5364:Roger Myerson 5362: 5360: 5357: 5355: 5354:Robert Aumann 5352: 5350: 5347: 5345: 5342: 5340: 5337: 5335: 5332: 5330: 5327: 5325: 5322: 5320: 5317: 5315: 5312: 5310: 5309:Lloyd Shapley 5307: 5305: 5302: 5300: 5297: 5295: 5294:Kenneth Arrow 5292: 5290: 5287: 5285: 5282: 5280: 5277: 5275: 5274:John Harsanyi 5272: 5270: 5267: 5265: 5262: 5260: 5257: 5255: 5252: 5250: 5247: 5245: 5244:Herbert Simon 5242: 5240: 5237: 5235: 5232: 5230: 5227: 5225: 5222: 5220: 5217: 5215: 5212: 5210: 5207: 5205: 5202: 5200: 5197: 5195: 5192: 5190: 5187: 5185: 5182: 5181: 5179: 5173: 5167: 5164: 5162: 5159: 5157: 5154: 5152: 5149: 5147: 5144: 5142: 5139: 5137: 5134: 5132: 5129: 5127: 5124: 5123: 5121: 5117: 5111: 5108: 5106: 5103: 5101: 5098: 5096: 5093: 5091: 5088: 5086: 5083: 5081: 5078: 5076: 5073: 5071: 5068: 5066: 5063: 5061: 5058: 5056: 5053: 5051: 5048: 5046: 5045:Fair division 5043: 5041: 5038: 5036: 5033: 5031: 5028: 5026: 5023: 5021: 5020:Dictator game 5018: 5016: 5013: 5011: 5008: 5006: 5003: 5001: 4998: 4996: 4993: 4991: 4988: 4986: 4983: 4981: 4978: 4976: 4973: 4971: 4968: 4966: 4963: 4961: 4958: 4956: 4953: 4951: 4948: 4946: 4943: 4941: 4938: 4936: 4933: 4931: 4928: 4926: 4923: 4921: 4918: 4916: 4913: 4911: 4908: 4907: 4905: 4903: 4899: 4893: 4892:Zero-sum game 4890: 4888: 4885: 4883: 4880: 4878: 4875: 4873: 4870: 4868: 4865: 4863: 4862:Repeated game 4860: 4858: 4855: 4853: 4850: 4848: 4845: 4843: 4841: 4837: 4835: 4832: 4830: 4827: 4825: 4822: 4820: 4817: 4815: 4812: 4811: 4809: 4807: 4801: 4795: 4792: 4790: 4787: 4785: 4782: 4780: 4779:Pure strategy 4777: 4775: 4772: 4770: 4767: 4765: 4762: 4760: 4757: 4755: 4752: 4750: 4747: 4745: 4744:De-escalation 4742: 4740: 4737: 4735: 4732: 4730: 4727: 4725: 4722: 4720: 4717: 4716: 4714: 4712: 4708: 4702: 4699: 4697: 4694: 4692: 4689: 4687: 4686:Shapley value 4684: 4682: 4679: 4677: 4674: 4672: 4669: 4667: 4664: 4662: 4659: 4657: 4654: 4652: 4649: 4647: 4644: 4642: 4639: 4637: 4634: 4632: 4629: 4627: 4624: 4622: 4619: 4617: 4614: 4612: 4609: 4607: 4604: 4602: 4599: 4597: 4594: 4592: 4589: 4587: 4584: 4582: 4579: 4578: 4576: 4574: 4570: 4566: 4560: 4557: 4555: 4554:Succinct game 4552: 4550: 4547: 4545: 4542: 4540: 4537: 4535: 4532: 4530: 4527: 4525: 4522: 4520: 4517: 4515: 4512: 4510: 4507: 4505: 4502: 4500: 4497: 4495: 4492: 4490: 4487: 4485: 4482: 4480: 4477: 4475: 4472: 4471: 4469: 4465: 4461: 4453: 4448: 4446: 4441: 4439: 4434: 4433: 4430: 4418: 4415: 4413: 4410: 4409: 4406: 4400: 4397: 4395: 4392: 4390: 4387: 4385: 4382: 4380: 4377: 4375: 4372: 4370: 4367: 4365: 4362: 4360: 4357: 4355: 4352: 4350: 4349:Hash function 4347: 4345: 4342: 4340: 4337: 4335: 4332: 4330: 4327: 4325: 4322: 4320: 4317: 4315: 4312: 4310: 4307: 4305: 4304:Binary search 4302: 4300: 4297: 4296: 4294: 4290: 4284: 4281: 4279: 4276: 4274: 4271: 4269: 4266: 4264: 4261: 4259: 4256: 4254: 4251: 4249: 4246: 4244: 4241: 4239: 4236: 4234: 4231: 4229: 4226: 4224: 4221: 4219: 4216: 4215: 4213: 4209: 4205: 4201: 4194: 4189: 4187: 4182: 4180: 4175: 4174: 4171: 4163: 4159: 4158: 4153: 4149: 4145: 4141: 4137: 4133: 4128: 4124: 4120: 4116: 4112: 4111: 4106: 4102: 4101: 4097: 4089: 4085: 4081: 4077: 4073: 4069: 4065: 4061: 4054: 4051:(June 1975). 4050: 4044: 4041: 4036: 4032: 4028: 4024: 4020: 4016: 4012: 4010: 4004: 3998: 3995: 3990: 3989: 3984: 3978: 3975: 3971: 3969: 3964: 3960: 3955: 3952: 3948: 3944: 3940: 3936: 3932: 3925: 3922: 3917: 3913: 3909: 3907:9780134610993 3903: 3899: 3898: 3893: 3889: 3883: 3880: 3875: 3873:9780262150415 3869: 3865: 3861: 3854: 3851: 3846: 3844:9781107005488 3840: 3836: 3832: 3828: 3821: 3819: 3815: 3810: 3806: 3802: 3801: 3793: 3790: 3782: 3775: 3772: 3766: 3761: 3758: 3756: 3753: 3751: 3748: 3746: 3743: 3741: 3738: 3736: 3733: 3731: 3728: 3726: 3723: 3721: 3718: 3716: 3713: 3711: 3708: 3706: 3703: 3701: 3698: 3696: 3693: 3691: 3688: 3686: 3683: 3682: 3677: 3675: 3673: 3669: 3667: 3662: 3654: 3652: 3649: 3645: 3637: 3635: 3617: 3613: 3608: 3606: 3602: 3598: 3594: 3590: 3586: 3578: 3562: 3553: 3544: 3532: 3529: 3526: 3520: 3511: 3503: 3502: 3501: 3499: 3498: 3481: 3468: 3464: 3445: 3436: 3433: 3430: 3424: 3416: 3403: 3395: 3383: 3377: 3374: 3368: 3363: 3351: 3350: 3349: 3347: 3322: 3308: 3307:loss function 3292: 3283: 3280: 3277: 3271: 3261: 3260:risk function 3245: 3236: 3233: 3223: 3204: 3194: 3191:, we have an 3190: 3184: 3176: 3174: 3172: 3169:In addition, 3167: 3165: 3161: 3157: 3153: 3144: 3139: 3137: 3135: 3131: 3127: 3123: 3122: 3117: 3116: 3111: 3107: 3102: 3101: 3096: 3092: 3088: 3084: 3083: 3077: 3075: 3071: 3067: 3063: 3055: 3050: 3042: 3035: 3033: 3031: 3015: 3006: 3003: 3000: 2997: 2994: 2985: 2982: 2976: 2973: 2970: 2952: 2950: 2943: 2937: 2933: 2929: 2925: 2922: 2918: 2914: 2910: 2906: 2902: 2898: 2895: 2891: 2887: 2884: 2880: 2876: 2874: 2866: 2864: 2862: 2857: 2855: 2850: 2848: 2844: 2840: 2836: 2832: 2831: 2825: 2824: 2819: 2814: 2812: 2808: 2804: 2799: 2794: 2792: 2788: 2784: 2780: 2776: 2772: 2768: 2764: 2760: 2756: 2752: 2748: 2744: 2740: 2736: 2731: 2729: 2725: 2720: 2716: 2712: 2708: 2700: 2698: 2696: 2692: 2687: 2683: 2679: 2675: 2671: 2666: 2664: 2656: 2654: 2652: 2648: 2640: 2638: 2636: 2631: 2629: 2628:zero-sum game 2625: 2617: 2615: 2613: 2577: 2557: 2553: 2496:chose B1 and 2495: 2437: 2382: 2377: 2375: 2371: 2367: 2363: 2359: 2354: 2352: 2348: 2344: 2340: 2336: 2332: 2328: 2324: 2320: 2316: 2312: 2308: 2304: 2300: 2299:payoff matrix 2296: 2292: 2288: 2278: 2275: 2272: 2270:A chooses A3 2269: 2268: 2264: 2258: 2255: 2253:A chooses A2 2252: 2251: 2247: 2244: 2241: 2239:A chooses A1 2238: 2237: 2234:B chooses B3 2233: 2231:B chooses B2 2230: 2228:B chooses B1 2227: 2225: 2224: 2215: 2213: 2211: 2207: 2186: 2179: 2178: 2177: 2171: 2165: 2163: 2158: 2156: 2152: 2144: 2142: 2122: 2119: 2116: 2090: 2083: 2080: 2077: 2048: 2045: 2042: 2039: 2010: 2007: 2004: 1972: 1969: 1966: 1963: 1937: 1926: 1923: 1920: 1916: 1910: 1905: 1900: 1897: 1894: 1890: 1854: 1851: 1848: 1844: 1838: 1833: 1828: 1825: 1822: 1818: 1803: 1783: 1780: 1776: 1751: 1742: 1739: 1735: 1710: 1701: 1698: 1694: 1686: 1682: 1678: 1651: 1648: 1644: 1616: 1612: 1582: 1579: 1575: 1571: 1566: 1562: 1553: 1549: 1525: 1521: 1512: 1496: 1487: 1484: 1480: 1449: 1445: 1412: 1409: 1405: 1401: 1396: 1392: 1383: 1379: 1339: 1336: 1332: 1328: 1323: 1319: 1310: 1306: 1297: 1293: 1273: 1270: 1266: 1257: 1248: 1245: 1241: 1237: 1232: 1228: 1219: 1215: 1206: 1202: 1189: 1186: 1182: 1173: 1163: 1159: 1149: 1148: 1147: 1145: 1140: 1108: 1104: 1098: 1093: 1088: 1084: 1074: 1073: 1072: 1051: 1045: 1042: 1032: 1029: 1026: 1022: 987: 973: 967: 964: 954: 951: 948: 944: 917: 916: 915: 892: 889: 885: 881: 876: 872: 863: 859: 850: 846: 833: 830: 826: 817: 807: 803: 793: 792: 791: 789: 784: 783:minimax value 779: 762: 759: 756: 730: 727: 724: 697: 694: 689: 684: 681: 678: 674: 651: 648: 628: 613: 610: 605: 600: 597: 594: 590: 555: 554: 553: 551: 546: 524: 521: 518: 513: 510: 507: 504: 499: 492: 489: 486: 483: 478: 475: 472: 467: 460: 457: 454: 451: 446: 443: 440: 435: 428: 423: 410: 409: 408: 385: 352: 348: 340: 323: 320: 316: 308: 287: 283: 275: 256: 253: 246: 240: 239: 238: 215: 212: 208: 204: 199: 195: 186: 182: 173: 170: 166: 153: 149: 140: 135: 130: 126: 116: 115: 114: 111: 110:maximin value 103: 98: 96: 94: 91: 87: 85: 79: 76:the possible 75: 71: 67: 63: 59: 55: 51: 47: 43: 39: 33: 19: 5587: 5339:Peyton Young 5334:Paul Milgrom 5249:Hervé Moulin 5189:Amos Tversky 5135: 5131:Folk theorem 4842:-player game 4839: 4764:Grim trigger 4374:Root-finding 4353: 4299:Backtracking 4263:Segment tree 4233:Fenwick tree 4155: 4144:the original 4139: 4126: 4108: 4063: 4059: 4049:Harsanyi, J. 4043: 4018: 4014: 4008: 4005:(May 1973). 3997: 3987: 3977: 3968:New Politics 3966: 3959:Noam Chomsky 3954: 3946: 3934: 3930: 3924: 3895: 3882: 3863: 3853: 3830: 3827:Solan, Eilon 3807:– via 3799: 3792: 3774: 3664: 3658: 3647: 3641: 3615: 3609: 3582: 3495: 3460: 3345: 3186: 3168: 3160:Murphy's law 3151: 3148: 3129: 3125: 3119: 3113: 3109: 3105: 3098: 3094: 3090: 3086: 3080: 3078: 3073: 3069: 3065: 3059: 2953: 2946: 2941: 2935: 2931: 2927: 2923: 2920: 2916: 2912: 2908: 2904: 2900: 2896: 2893: 2889: 2885: 2882: 2878: 2870: 2858: 2851: 2843:forced moves 2827: 2821: 2815: 2795: 2782: 2778: 2774: 2770: 2766: 2762: 2758: 2754: 2750: 2738: 2734: 2732: 2727: 2723: 2706: 2704: 2694: 2690: 2685: 2681: 2673: 2669: 2667: 2660: 2651:folk theorem 2644: 2632: 2623: 2621: 2575: 2555: 2551: 2493: 2435: 2380: 2378: 2373: 2369: 2365: 2361: 2357: 2355: 2350: 2346: 2342: 2338: 2334: 2330: 2326: 2322: 2318: 2314: 2310: 2306: 2302: 2294: 2290: 2286: 2284: 2205: 2195: 2167: 2159: 2148: 1804: 1510: 1367: 1143: 1141: 1130: 1066: 913: 787: 782: 780: 713: 547: 544: 386: 374: 236: 109: 107: 83: 82:worst case ( 73: 50:saddle point 49: 45: 41: 37: 36: 5709:Game theory 5643:Game theory 5456:Coopetition 5259:Jean Tirole 5254:John Conway 5234:Eric Maskin 5030:Blotto game 5015:Pirate game 4824:Global game 4794:Tit for tat 4729:Bid shading 4719:Appeasement 4569:Equilibrium 4549:Solved game 4484:Determinacy 4467:Definitions 4460:game theory 4253:Linked list 3831:Game Theory 3745:Tit for Tat 3644:lesser evil 3115:parent node 3032:algorithm. 2847:impractical 2678:tic-tac-toe 2204:. The name 99:Game theory 93:game theory 62:game theory 40:(sometimes 5678:Categories 5100:Trust game 5085:Kuhn poker 4754:Escalation 4749:Deterrence 4739:Cheap talk 4711:Strategies 4529:Preference 4458:Topics of 4389:Sweep line 4364:Randomized 4292:Algorithms 4243:Hash table 4204:algorithms 3931:IEEE Micro 3767:References 3661:John Rawls 3344:is called 3110:child node 3100:child node 3074:look-ahead 2949:leaf nodes 2919:value 2888:depth = 0 2873:pseudocode 2867:Pseudocode 2828:effective 2637:strategy. 1012:). Hence: 664:). Hence: 580:). Hence: 74:minimizing 70:philosophy 66:statistics 5540:Decisions 5284:John Nash 4990:Stag hunt 4734:Collusion 4384:Streaming 4369:Recursion 4152:"Minimax" 4115:EMS Press 4088:118261543 4003:Arrow, K. 3983:Rawls, J. 3803:(video). 3735:Negascout 3554:θ 3548:Π 3545:⁡ 3533:δ 3527:θ 3516:Θ 3512:∫ 3476:Π 3437:δ 3431:θ 3417:θ 3404:δ 3387:~ 3384:δ 3375:θ 3364:θ 3326:~ 3323:δ 3284:δ 3278:θ 3240:Θ 3237:∈ 3234:θ 3222:parameter 3205:δ 3193:estimator 3132:possible 3121:root node 3082:leaf node 3004:− 2995:− 2986:− 2823:game tree 2807:Deep Blue 2798:heuristic 2711:algorithm 2674:algorithm 2438:would be 2376:chooses. 2368:chooses; 2358:dominated 2341:believes 2329:believes 2040:− 1970:− 1932:¯ 1911:≤ 1906:_ 1860:¯ 1839:≤ 1834:_ 1781:− 1740:− 1699:− 1649:− 1580:− 1509:We first 1485:− 1410:− 1337:− 1271:− 1246:− 1187:− 1169:¯ 1114:¯ 1099:≤ 1094:_ 1038:¯ 960:¯ 890:− 831:− 813:¯ 690:_ 649:− 637:(playing 606:_ 564:(playing 505:− 484:− 458:− 321:− 254:− 213:− 171:− 136:_ 5561:Concepts 5425:Lazy SMP 5119:Theorems 5070:Deadlock 4925:Checkers 4806:of games 4573:concepts 3985:(1971). 3916:20190474 3894:(2021). 3862:(1994). 3678:See also 3616:interval 3126:minimize 3095:smallest 2928:for each 2909:for each 2879:function 2835:children 2695:minimize 2691:maximize 2610:. 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The 2670:simple 2514:+ 0 × 2456:− 1 × 2129:  2111:  2072:  2017:  1999:  1979:  1958:  1885:  1865:  1813:  1790:  1772:  1749:  1731:  1675:  1623:  1608:  1494:  1476:  1456:  1441:  1421:  1376:  1049:  971:  80:for a 68:, and 42:Minmax 4915:Chess 4902:Games 4268:Stack 4258:Queue 4238:Graph 4218:Array 4160:. US 4084:S2CID 4076:JSTOR 4056:(PDF) 4031:JSTOR 3784:(PDF) 3500:risk 3154:(see 2820:of a 2818:nodes 2803:plies 2787:chess 2612:mixed 2498:−2 × 2184:, and 1541:from 1004:) or 926:) or 395:, or 5603:Risk 4596:Core 4339:Fold 4283:Trie 4278:Tree 4248:Heap 4202:and 4162:NIST 3912:LCCN 3902:ISBN 3868:ISBN 3839:ISBN 3628:) = 3603:and 3134:loss 3128:the 3062:tree 2921:else 2905:then 2894:then 2871:The 2773:and 2715:game 2440:3 × 2301:for 2289:and 1877:and 1468:and 1008:(if 1000:(if 788:know 781:The 570:−100 108:The 78:loss 72:for 5175:Key 4068:doi 4023:doi 3965:," 3939:doi 3663:'s 3587:or 3413:sup 3400:inf 3360:sup 3162:or 2989:min 2965:max 2789:or 2686:can 2682:can 2661:In 2279:+1 2276:−3 2273:−4 2265:+4 2256:−1 2248:+2 2245:−2 2242:+3 2029:or 1289:max 1262:min 1198:max 1178:min 996:), 842:max 822:min 578:−10 508:100 403:or 162:min 145:max 84:max 48:or 5680:: 4910:Go 4154:. 4138:. 4125:. 4113:, 4107:, 4082:. 4074:. 4064:69 4062:. 4058:. 4029:. 4019:70 4017:. 4013:. 3945:. 3935:19 3933:. 3910:. 3890:; 3833:. 3817:^ 3632:." 3607:. 3136:. 2932:do 2913:do 2901:if 2890:or 2886:if 2883:is 2791:go 2705:A 2668:A 2605:3 2589:3 2569:3 2544:3 2530:= 2525:6 2509:6 2486:3 2472:= 2467:6 2451:6 2427:6 2410:6 2394:3 2262:0 2212:. 2157:. 2043:10 1973:20 778:. 652:20 487:10 461:20 391:, 64:, 60:, 56:, 46:MM 44:, 5525:e 5518:t 5511:v 4840:n 4451:e 4444:t 4437:v 4192:e 4185:t 4178:v 4164:. 4090:. 4070:: 4037:. 4025:: 4011:" 3970:, 3941:: 3918:. 3876:. 3847:. 3811:. 3668:, 3630:n 3626:X 3624:( 3622:ℰ 3563:. 3557:) 3551:( 3542:d 3536:) 3530:, 3524:( 3521:R 3482:. 3446:. 3440:) 3434:, 3428:( 3425:R 3396:= 3393:) 3378:, 3372:( 3369:R 3293:. 3287:) 3281:, 3275:( 3272:R 3246:. 3016:, 3010:) 3007:b 3001:, 2998:a 2992:( 2983:= 2980:) 2977:b 2974:, 2971:a 2968:( 2801:" 2775:B 2767:A 2763:B 2759:A 2755:B 2751:A 2739:B 2735:A 2728:A 2724:A 2602:/ 2599:2 2586:/ 2583:1 2576:A 2566:/ 2563:1 2556:B 2552:B 2541:/ 2538:1 2534:+ 2522:/ 2519:5 2506:/ 2503:1 2494:B 2483:/ 2480:1 2476:+ 2464:/ 2461:5 2448:/ 2445:1 2436:A 2432:: 2424:/ 2421:5 2407:/ 2404:1 2391:/ 2388:1 2381:A 2374:A 2370:B 2366:B 2362:A 2351:B 2347:A 2343:B 2339:A 2335:B 2331:A 2327:B 2323:B 2319:A 2315:A 2311:B 2307:B 2303:A 2291:B 2287:A 2260:+ 2202:V 2198:V 2191:. 2189:V 2182:V 2174:V 2126:) 2123:1 2120:, 2117:3 2114:( 2091:, 2087:) 2084:R 2081:, 2078:M 2075:( 2052:) 2049:1 2046:, 2037:( 2014:) 2011:R 2008:, 2005:T 2002:( 1976:) 1967:, 1964:2 1961:( 1938:, 1927:l 1924:o 1921:c 1917:v 1901:l 1898:o 1895:c 1891:v 1855:w 1852:o 1849:r 1845:v 1829:w 1826:o 1823:r 1819:v 1784:i 1777:a 1752:. 1743:i 1736:a 1711:, 1707:) 1702:i 1695:a 1691:( 1683:i 1679:v 1652:i 1645:a 1617:i 1613:a 1588:) 1583:i 1576:a 1572:, 1567:i 1563:a 1559:( 1554:i 1550:v 1526:i 1522:a 1497:. 1488:i 1481:a 1450:i 1446:a 1418:) 1413:i 1406:a 1402:, 1397:i 1393:a 1389:( 1384:i 1380:v 1351:) 1345:) 1340:i 1333:a 1329:, 1324:i 1320:a 1316:( 1311:i 1307:v 1298:i 1294:a 1283:( 1274:i 1267:a 1258:= 1254:) 1249:i 1242:a 1238:, 1233:i 1229:a 1225:( 1220:i 1216:v 1207:i 1203:a 1190:i 1183:a 1174:= 1164:i 1160:v 1137:i 1133:i 1109:i 1105:v 1089:i 1085:v 1069:i 1052:. 1046:1 1043:= 1033:l 1030:o 1027:c 1023:v 1010:B 1006:4 1002:M 998:1 994:T 990:1 974:. 968:4 965:= 955:w 952:o 949:r 945:v 932:L 928:5 924:R 920:4 898:) 893:i 886:a 882:, 877:i 873:a 869:( 864:i 860:v 851:i 847:a 834:i 827:a 818:= 808:i 804:v 766:) 763:1 760:, 757:3 754:( 734:) 731:L 728:, 725:T 722:( 710:. 698:0 695:= 685:l 682:o 679:c 675:v 639:R 635:0 631:L 626:. 614:2 611:= 601:w 598:o 595:r 591:v 574:M 566:B 562:2 558:T 525:4 522:, 519:4 514:2 511:, 500:B 493:1 490:, 479:0 476:, 473:5 468:M 455:, 452:2 447:1 444:, 441:3 436:T 429:R 424:L 405:R 401:L 397:B 393:M 389:T 382:i 378:i 371:. 369:i 353:i 349:v 324:i 317:a 306:. 304:i 288:i 284:a 273:. 271:i 257:i 242:i 221:) 216:i 209:a 205:, 200:i 196:a 192:( 187:i 183:v 174:i 167:a 154:i 150:a 141:= 131:i 127:v 34:. 20:)

Index

Minimax algorithm
Minimax (disambiguation)
artificial intelligence
decision theory
game theory
statistics
philosophy
loss
worst case (maximum loss) scenario
zero-sum
game theory
pure strategies
zero-sum games
Nash equilibrium
minimax theorem
zero-sum
example of a game without a value
payoff matrix
mixed
zero-sum game
Nash equilibrium
repeated games
folk theorem
combinatorial game theory
tic-tac-toe
algorithm
game
position evaluation function
combinatorial game theory
John H. Conway

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