[trypt]

My method was to close my eyes then open them somewhere "random" on my screen and the first letter my eyes focused on, I checked whether it was a low (left) or high (right) letter. I'm aware that the distribution isn't this simple but that's what I used. This worked okay for a while and the machine was only predicting me at 43%, then I tried using just my brain and it started winning.

A person good at mental arithmetic could memorize a small-state PRNG and get good results but I couldn't personally do this. I wonder if this has any strategic advantages in any areas of life. Maybe poker?