This is fantastic! Thanks so much for sharing, I learned so much from reading yo...

This is fantastic! Thanks so much for sharing, I learned so much from reading your very elegant and well-commented code.

Just in case anyone is looking at this and wants a direct link to play pavel_lishin's version, here's the raw github version: https://rawgithub.com/pavellishin/drop7/master/drop7.html

Side note: I got hooked on Drop7 during my first semester in college. I was fascinated by the game and wrote a simulator to pick the optimal move: https://github.com/keshavsaharia/Drop7Simulator