Tsumego training your life and death skill.
It is also important to know if you are ahead or behind in order to choose beween (big but risky move) or (safe but small move)
But, I didn’t see any resource about it.
So, I made quickly prototype in Excel with using RANDBETWEEN( ; ) and drawing it by stacked bar
I created parameter (area difference less or equal than … )
And so I started to play. When I guess correctly which area is bigger, I decrease parameter. When I mistake, I increase it. I didn’t count, choose intuitively.
Reached max difficulty (area difference 1) surprisingly fast.
So I locked difficulty at max, but after many tries was unable to beat first record of 6 correct guesses in a row. It was not bigger than 2 correct guesses in a row after that, so it seems it was random, not skill.
Maybe someone will make online version of something like this? It certainly easy.
My excel file is too weird to upload. Maybe I will make for myself java version which able to paint more than 2 areas, but I will be too lazy to make it user friendly.