anonymous: I'm going through a book of Go Problems, and I don't get this one. Marked black stone is the correct answer, but I don't see how that kills white... I'm definitely an inexperienced player, but there's just something I'm totally missing here. Any ideas?
unkx80: The objective is for Black to live without ko. In this case, Black lives, but White also lives. The condition is called seki, in that if Black tries to kill White, Black gets killed instead. Please feel free to ask for more clarification.