Ivan Detkov: I added a stone at S17 to save this task.
caranthir: Good. The ending is kind of messy now, though, because the ladder can be chased way longer. I added a couple of trivial alternative endings and made it a correct ending too if the player chooses the longer extension (not adding those several possible longer variations.)
bliviu: the problem might be an error. right at the end of the sequence after white gives atari t16, black can take the stone at t18 and make a ko instead of extending at t17. white doesn't have any ko threats so the whole position collapses
Good. The ending is kind of messy now, though, because the ladder can be chased way longer. I added a couple of trivial alternative endings and made it a correct ending too if the player chooses the longer extension (not adding those several possible longer variations.)