By DomQ
I peeked at the solution on goproblems.com, but it appears incorrect to me. The correct second move for White is 4, and then Black a or c or d is answered by White b, while Black b is answered by White a. Shouldn't the marked white stone be removed for the problem to make sense(i)? I keep searching but cannot find a way for Black to kill.
unkx80: I deliberately added the stone to make the problem harder, and there, someone has fallen into the trap. =P
Shaydwyrm: If black a is answered by b, then black can play d and white is dead.
unkx80: And there, we have the solution. ;)