[kenrick95]

I admit that the AI is not perfect. :)

[tromp]

My Fhourstones solver and a perfect playing applet may be found at http://tromp.github.io/c4/c4.html

[unstabilo]

No need to apologize, even if it's perfect, the first player can always win by playing the right moves.

[stefs]

a perfect AI would be rather boring anyway!