Thanks for the compliments :)!
I hope it did not bother you a lot and you had still some fun ;)!?
Another reviewer mentioned that on mouse hover showing the possible moves could be a handy idea. Maybe that solves the tutorial a bit. But you are right: a tutorial would have been nice. Oh 72 hours is too short ;). Also for the master AI it was too short. I tried to let the AI think at least 1 move ahead, but it would have been nice if it calculated more moves in advance and choose the best valued one. That would be a nice addition for an update.
Thanks again for playing and the kind words :)!