I’ve written over 300 posts about game theory, and mostly the articles are about how game theory can be used to solve problems in business, politics, or real life–in other words, about anything other than games. Of course, game theory can be used to analyze actual games as well, and today’s example is about the winning strategy in a popular board game.
Connect Four is a two player board game similar to Tic-Tac-Toe. Each player takes turns dropping a colored disc into a board that has 7 vertical columns and 6 horizontal rows. The goal of the game is to connect four pieces of the same color–vertically, horizontally, or diagonally–before the other player does so. The game ends in a tie if neither player connects four when all the 42 board positions are filled up.
While the rules are simple, the game is surprisingly difficult to analyze. Even a simple question like “is there a winning strategy” becomes a complicated task. Strategies like “play in the center” and “make sure to block your opponent” will only take a player so far, and occasionally these strategies will lose. Trying to work out a winning strategy by trial and error would turn out to be an insurmountable task, as there are over 70 trillion possible Connect Four games.
Lucky for us, some people have worked out the game with computers and found the winning strategy. There is even a game solver that makes winning the game as easy as following directions from your smartphone.
Beat the game without activating any alert phases. Panther: Get over 75 alert phases, over 250 kills, and less than 25 coninues. Pig: Use more than 50 recovery items: Pigeon: Beat the game without killing asingle person (Gekkos and Dwarf Gekkos dont count). Puma: Get over 75 alert phases, over 250 kills, and over 25 continues. To take a screenshot with your Mac, Command + Shift + 3 and then release all keys to captuer the whole screen, or press Command + Shift + 4 and press down.
Play Connect 4 game online. Connect 4 walkthrough, cheats and review!
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UPDATE 11-2016 I have been told the solver linked in this post is not working. A commenter suggested the following website: Connect 4 solver (http://connect4.gamesolver.org/)
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'All will be well if you use your mind for your decisions, and mind only your decisions.' Since 2007, I have devoted my life to sharing the joy of game theory and mathematics. MindYourDecisions now has over 1,000 free articles with no ads thanks to community support! Help out and get early access to posts with a pledge on Patreon.
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The first solutions of Connect Four
Here is a little bit of history on how the game was solved.
It is no small feat to solve the game, and remarkably two people in 1988 independently derived the answer. James D. Allen and Victor Allis both found that the first player has a winning strategy to the game. That’s the good news. The bad news is that the winning strategy is extremely complicated to describe. There are so many configurations of the board to consider. Additionally, one has to play very carefully because in many situations there is only one winning move, and every other move will be a losing move–allowing the second player to be able to force a win.
Comprehending the winning strategies as described, however, is no easy task. Allen’s explanation involves many new terms like aji, sente, and tenuki. Allis’s paper similarly employs the obscure vocabulary of threats, useless threats, baseinverse, and zugzwang. To get an appreciation for the complex strategy, just peruse one of the following documents: (Allen) Expert play in Connect Four or (Allis) A Knowledge-based Approach of Connect-Four.
Although a winning strategy has been described since 1988, there was not an easy way for a casual fan to utilize the knowledge. Now there is.
A game solver you can use from your smartphone!
This handy solver is the result of research from Dan Garcia, a professor of Computer Science at Berkeley.
Here is the URL:
UPDATE 11-2016 I have been told the solver linked in this post is not working. A commenter suggested the following website: Connect 4 solver (http://connect4.gamesolver.org/)
Here are the steps on using the solver.
1. To solve for the classic game, go with the default option (of having 7 columns and 6 rows and 4 in a row wins.) You can change the options if you are playing on a different board.
2. Click “Play!” and you will see the board.
3. VERY IMPORTANT: You want to click the check-mark for “Move-values” under the heading “DISPLAY OPTIONS.” This option will display colors in each column. A green color indicates a winning move (this is where you should play), yellow indicates a tie, and red a losing move.
4. Be the first person to move. Input your moves and your opponent’s moves and keep playing winning moves. You’ll win every time!
Here is an example of the steps. The board was chosen to be 7×6 with 4 in a row winning. I have selected the check-mark “Move-values” and I’m ready to play first.
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Here is what the board looks like.
It turns out the only winning move is to play in the center. I do this.
Now it’s the other player’s turn. The game solver illustrates that every move is losing–it doesn’t matter where the other player goes.
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Suppose the other person plays directly on top in the center.
What to do now? The important thing is to follow the game solver. In this configuration, there is only one good move to play–all other moves will be losing (that is, it will allow the other player to win the game with proper play).
With perfect play from both sides, many games will take 41 (in other words, the board of 42 posts will almost entirely be filled up). I will not belabor you with the details of completing a game, but you get the idea of how the solver works.
If you diligently follow the steps of this tool, you can always win at Connect Four! It’s as easy as that.
Now the real trick will be finding a way to use the solver without the other person catching on. Coming up with a good excuse to keep checking your phone (you’re getting a lot of text messages?) will be the true test of a good strategist.
UPDATE 11-2016 I have been told the solver linked in this post is not working. A commenter suggested the following website: Connect 4 solver (http://connect4.gamesolver.org/)
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- First of all you need to close all running apps on your device;
- Open Connect Four and immediately close it;
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- Enter the Cheat Code in this field which you see on this image
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