posetcay: I flagged some of the inferior ko solutions (mostly the ones with throw-ins) as false and changed problem description to (best ko), I can modify the problem to accept all ko solutions as correct if the majority disagrees, but it doesnt feel right to me since some of them are objectively inferior by a significant margin.
d4rkm4tter: I thought a bit about the ko that starts with C1. Yes, it gives many local threats on the outside, so let's say it is incorrect.
Many people get this wrong on the first try. The algorithm says it is 1k and the algorithm is boss ;)