posetcay: @Sadaharu: Sorry, I didn't see your response to my earlier comment. It seems that black can't avoid ko after S15/T15 if opponent answer with P19, so I marked those moves as wrong. I still think this version is better than the original version though.
posetcay: This problem is very strange because white is already dead, black does not even need to play anything. Thats why I moved the S15 stone R14. S15 is one of the accepted answers to show why white was already dead.
jhubert: After the hane at E19 and the answer at C18, why D19 is incorrect ? I think it works as the two 1-2 points which are indicated in the review.
d4rkm4tter: Hi Jerome, I added your move. Great work on the Kanzufu problems. I played them and added them to the queue. I also didn't forget your request for better problem editing.
Morph: I don't see why E1 doesn't work.
Even if there is extra stone at C3, ot would be L+1 shape and E1 should kill it.
Yes, it's not exactly L+1 since there is no stone at B4, but i don't see how that helps.
theob: S18R18S19 I don't see how black can live. There is no eye in T17 (T16S16 are miai)and if black tries to make an eye in Q19 with R19 we kill it with P19 and if P19 then R19 makes a dead shape
+ B19 , by answering B19, best answer is ko. So i think B16 is not the right answer