kovarex: Ok, I consluted with another strong player and I made this change:
I added 10 000 years ko as a special status, and it is considered to be the same value as -1 move approach ko.
I changed this problem to be status based, and this result snow in both 10k ko and 1 move approach ko to be both solutions.
kovarex: I made corrections to this problem:
1) I took some idea from other internet source: https://www.go4go.net/go/carpenter_square_10
And realized that the 10 000 years ko (which I actually tried to do when returning to the problem), shouldn't be marked as incorrect.
Currently I believe, that the 10 000 years ko is the only and best solution, as 10 000 years ko seems to be better then 1 step approach ko, as 10 000 years ko can be directly change to 1 step approach ko at any time the attacker wants, but 1 step approach ko is played right away.
So I marked all 1 step approach ko variants wrong, and kept the 10 000 years ko variant as the only correct in this problem.
I'm open to feedback!
posetcay: I disagree that 10 000 year ko is superior to approach ko, but it could be possible to accept both 10 000 year ko and approach ko solutions.
I couldn't follow your comment.