Marta: Hi, I believe that this problem has a wrong follow-up if someone plays G19 as white. What it currently does is G19, H19, H18, G18. In this way opponent can play J18 and kill the group which shouldn't be the solution.
caranthir: Thanks. Opponent should play J18 instead of G18, which was already in the tree as an option. I removed G18 and the sequence that followed.
Hi, I believe that this problem has a wrong follow-up if someone plays G19 as white. What it currently does is G19, H19, H18, G18. In this way opponent can play J18 and kill the group which shouldn't be the solution.