RobertL: It probably gets too complex for this puzzle, but couldn't H18, G18, G17 work, too?
caranthir: Technically, yes, but it's just a bad move since it starts an unfavorable ladder, and still eyes would have to be made at some point. I'd rather not add these lines.
It probably gets too complex for this puzzle, but couldn't H18, G18, G17 work, too?