Connect 4 v1.0

I made the simple game of connect 4 in minecraft. Note: this map is pretty bare with not much "customization" to it however, it is still very playable. I will spend a lot of time making Connect 4  better if you want me to. Just say what you want better and I will most likely do it.

This map is best for 2 players in minecraft 1.8.9

I am quite an advanced redstone and command block builder so if you have any idea of how I could make this map better or anything else you would like me to build please let me know :)