Ascense: Should C19 be a valid answer. C19D19D17 kills, and C19D17C16 is the same as one of the valid answers.
guile: "My opponent vital point for living is my vital point for killing" applies. Try to figure what happens if your opponent think like this and answers with C4
"My opponent vital point for living is my vital point for killing" applies. Try to figure what happens if your opponent think like this and answers with C4