Play against the computer – Connect Four game in JavaScript

[i13e]

ICYI Connect Four is a solved game, you can read about it here: https://en.wikipedia.org/wiki/Connect_Four#Mathematical_solu...

[tromp]

You can solve it yourself from scratch in a few minutes by running my Fhourstones benchmark [1]. Other interesting connect-4 tidbits may be found on my connect-4 page [2].

[1] https://tromp.github.io/c4/fhour.html

[2] https://tromp.github.io/c4/c4.html

[pebcakID10T]

Yes, I may do a minimax version with a difficulty setting. That would be fun to do.

[isquaredr]

Thanks for sharing! This sent me down the solvability path. It would be cool to have an ‘expert’ mode that plays the optimal strategy.

[ReaLNero]

Your wish has been granted: https://connect4.gamesolver.org/

[Pxtl]

Ran into bug - AI beat me by creating a diagonal with the piece in the top rank and it did not count that as endgame. I was able to keep playing.

[pebcakID10T]

Should be fixed now - an off by one error checking diagonals that hit the top of the board. Thanks!

[pebcakID10T]

Yes, I need a bug report button.

[gus_massa]

It would be nice to be able to click in any square in the board, instead of just the ones in the bottom.

[pebcakID10T]

Good idea. Done.

[pebcakID10T]

Just a fun little project I did. It's beatable, but not easy.

[duderific]

It seems like going first is a disadvantage, since the AI can just play defensively until you are backed into a corner.

[POiNTx]

How good is the AI and how was it made?

[pipeline_peak]

The best trick I can think of is to reach a point where you can get connect four in two or more places and the bot can only cancel out one.