Proposed solution:
captures four stones. This sets up a snapback: if White a then Black b, or if White c then Black d.
unkx80: Correct. =)
Bill: BTW, what is the Chinese term for White's condition after ?
unkx80: If you mean snapback, then it is 倒扑; if you mean shortage of liberties, then it is 气紧; if you mean surrounded? then it is 包围. Which sense are you referring to?