Tsumego From Games 63/ Attempts
Rich: It's a well-known problem (I believe it's in Kageyama's Fundamentals of Go) - but for the DDKs, what's black's tesuji response to 3?
Walin: Looks like would kill white after .
Calvin: If white has a helping stone at , maybe this invasion can threaten to connect out like this. This appears in a few pro games. (Note is different here.) Without some external help, I don't know what to make of , unless it's a ko threat. Is a reasonable move?