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Questions tagged [minimax]

Use for questions involving minimax and variants such as maximin. Applies both to algorithms and the minimax theorem.

21 questions with no upvoted or accepted answers
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Can minimax be used when both players want to increase their score?

If both the players want to increase their score (by selecting the highest or best cost path), can this be done using the minimax algorithm, or are there other algorithms for this purpose?
Rachael E's user avatar
3 votes
0 answers
344 views

How to choose the weights for a linear combination of heuristic functions?

I need to write a minimax algorithm with alpha-beta pruning in limited time for the 2048 game. I know expectimax is better for this work. Assume I wrote different heuristic functions. If I want to ...
Mustafa Tufan's user avatar
2 votes
0 answers
471 views

Minimax evaluation function for games with score instead of loss/draw/win result

I am trying to create minimax evaluation function for the Ms Pacman game. The goal of the player is to maximize score. I have some idea about the features that I would like to use in my evaluation ...
Druudik's user avatar
  • 149
2 votes
0 answers
189 views

Which heuristic function should I use for the ColorShapeLinks game?

For learning purposes, I am trying to implement the minimax algorithm for the ColorShapeLinks game, which is similar to connect 4, except the fact that it combines both shape and color as the winning ...
Errata's user avatar
  • 21
2 votes
0 answers
112 views

How can I apply the alpha-beta pruning algorithm to the "1-2 steal marbles" problem?

I have the following problem called "1-2 steal marbles". Initially, there are 6 marbles on the board. One of the players can choose to remove 1 or 2 marbles leaving 5 or 4. After that, the other ...
Zhengliang Chen's user avatar
2 votes
0 answers
63 views

What kind of decision rule algorithm is usable in this situation?

I am trying to write an AI to a game, where there is no real adversary. This means, that only the AI player has choices in which move to perform, his opponent may or may not react to the move the AI ...
Adam Baranyai's user avatar
2 votes
0 answers
124 views

How do GAN's generator actually work?

I have implemented DCGAN's myself and have been studying GAN's for over a month now. Now I am implementing the pggans but I encountered a sentence When we measure the distance between the ...
Muhammad Rafique's user avatar
1 vote
0 answers
20 views

Two player grid-based game, minimax not good, what to try?

In this game, a matrix with size N x M is given (10<=N,M<=15). There a three main type of value in the matrix: A integer show how many gold is it Char 'D' show obstacle Char 'S' show shield (...
Parrottos 's user avatar
1 vote
0 answers
366 views

What happens if MIN plays suboptimally and unpredictably?

The following quotes are an extract from AIMA, 3ed. The definition of optimal play for MAX assumes that MIN also plays optimally—it maximizes the worst-case outcome for MAX. What if MIN does not play ...
InCrisis's user avatar
1 vote
0 answers
370 views

How should I choose the depth for minimax if I have a strict time constraint?

I am working on a controller that plays Ms. Pac-Man using a minimax algorithm. The controller has a limited time amount in which it can choose a move on each round, otherwise when the time runs out ...
InCrisis's user avatar
1 vote
0 answers
189 views

Is there a benefit to starting with MCTS and switching to minimax as the branching factor decreases?

I've invented a deterministic, perfect-information game with a fairly large branching factor (~150) which tapers out dramatically after the midgame (~30 at worst). I need a strong AI. My understanding ...
crass_sandwich's user avatar
1 vote
0 answers
45 views

Why is the number of examined nodes $ O(b^{3d/4})$ in $\alpha$-$\beta$ pruning?

I'm taking a course 'Introduction to AI' and, in one of the tutorials, it was written that when pruning the game tree using $\alpha$-$\beta$ boundaries, the number of nodes that will be developed, ...
E. Ginzburg's user avatar
1 vote
0 answers
103 views

Minimax algorithm with only partial visibility

I'm trying to implement the minimax algorithm with alpha beta pruning on a game that works like this: Player 1 plays (x1, y1). Player 2 can only see the x-value (x1) that Player 1 played (and not ...
SpiderManCity's user avatar
1 vote
0 answers
298 views

How do you prove that minimax algorithm outputs a subgame-perfect Nash equilibrium?

At every node, MAX would always move to maximise the minimum payoff while MIN choose to minimise the maximum payoff, hence there is nash equilibrium. By using backwards induction, at every node, MAX ...
goldilocks's user avatar
1 vote
1 answer
672 views

Is this ExpectiMinimax Tree correctly drawn?

I need help with ExpectiMinimax problem: Start a game. The first player flips a coin. The second player flips a coin. The first player decides if he wants to flip another coin. The second player ...
Fim Ka's user avatar
  • 11
1 vote
0 answers
240 views

Understanding alpha-beta pruning for simplified NIM

This is a simple version of NIM: Two players alternately remove one, two or three coins from a stack initially containing 5 coins. The player who picks up the last coin loses. What does alpha-beta ...
Lexi's user avatar
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1 vote
0 answers
203 views

Can't grasp MiniMax diagram (no alpha beta pruning)

The image is one of many similar exam questions can anyone pelase help me understand it fully? 'Internal node': This is simply every node except A? Move choices: His only options are B, C and D for ...
Jay.F's user avatar
  • 11
0 votes
1 answer
41 views

Can MAX ensure maximum minimum gain by using minimax once at game start?

MAX and MIN apply the minimax algorithm each time before making their move, searching to some predefined depth. Imagine, however, that the MAX player applies the minimax algorithm only once, at the ...
I love Java's user avatar
0 votes
0 answers
45 views

What algorithm should I use to train an antichess agent?

I will implement an antichess agent and am not sure about which algorithm to use. My current candidates are minimax with alpha-beta pruning, MCTS and proximal policy optimization. Should I consider ...
heyula's user avatar
  • 1
0 votes
0 answers
72 views

How to guess a card in the game of Cambio with limited information?

I need help with a probability problem in the card game of Cambio. In this game, two players are dealt four cards each from a deck of 52 cards . At the start of the game, the bottom cards of each ...
Ali Qaqan's user avatar
0 votes
1 answer
47 views

Query regarding the minimax value function of GANs

In the book Generative AI with Python and TensorFlow 2 from Babcock and Bali (page 172), it is stated that the value function of a GAN is the following: where D(x) is the output of the discriminator ...
Claudia P's user avatar