wow, is the CPU perfect? I cannot beat it. I keep ending up in a situation where the AI can beat me on its next turn in 2 different ways so I can't block both.
Try playing columns 4,2,3,4,6,2,3 - seems to play always the same up to here but then sometimes plays different, but it's trivial to win after this state - the AI seems to "give up"
It's not perfect. Yeah, I actually don't know why the AI seems to "give up" randomly.