Im SO glad a chess pro like you and your friend enjoyed the game truly makes me happy :D
And yeah an Ai could be implemented in 10 days.....if someone better than me at coding worked on the game but for me literally till the last minute i was still working on the game XD the pinning pieces and the check took me sooo long i was still learning things while making this game
This project made me learn alot however and i will release the Ai update soon