Tsumego From Games 56
From a game between two 4D on KGS. Among the spectators, the question arose of how to respond to White a. Is a response necessary? If so, where should Black respond.
Dieter: Yes, Black should respond, and b suffices. The question for me is if c is also possible.
Velobici: During the game one suggestion was W a, Black d, White b, Black e.