caranthir: I think the bent four solution is good enough as well (currently not accepted). You can't kill any further what's already dead.
caranthir: [posetcay: Bent four is almost as good as killing unconditionally, but still slightly inferior.] Yes, there could be unremovable ko threats. Still, there are literally dozens of problems on this site where a bent four solution is accepted as an option even though a direct solution or solutions exist(s). I see no special reason why it should be disallowed just here. Or allowed elsewhere if it's disallowed here.
d4rkm4tter: This problem was sort of a stress test for the current implementation. I deleted branches to see when it can be displayed in the besogo editor. Part of the issues come from the labels (A,B,...).
d4rkm4tter: I fixed this by improving the implementation. There is no size limit for the sgfs now.
kovarex: I made another inspection of this problem, and I probably doubled the amount of branches of killing. There are so many unexpected ways of killing it is incredible, almost every move has a way :)
Added.