TherapieGo: I disagree. For me, when I solve a problem, what I want is to know the most objective way of what would happen at a high level in a real game! At most, we can add a 'What about this answer' to start with the less optimal sequence, but not showing R19 is a mistake in my opinion.
Ivan Detkov: You can discuss it with the top. Agree or disagree the "rule" I described below is applied to a lot of problems here. Trust me, I know.
TherapieGo: In Black to play : [current position] + C1 If White play this move, it's impossible for Black to have a Ko advantageous.
Ivan Detkov: I agree, but the point is to make optimal offences. The defence could be sub-optimal if it complicates the offence. In other words, hamete are OK. I would rather keep things as it.
You can discuss it with the top. Agree or disagree the "rule" I described below is applied to a lot of problems here. Trust me, I know.