Regarding the 4-minute time limit for all 100 turns, I agree. For a tournament with such noble goals, the time shouldn't hinder participants from showcasing their strong gameplay. I tried single-player on this save (only playing as Castle) and there wasn't enough time to think; I had to load autosaves.
Big respect for the tournament, but if you find the strength to hold another one, the time should definitely be increased to 6 minutes.

P.S. When I started playing online a year ago, 4 minutes was perfectly sufficient. What's changed? :D