KarlKnechtel: threatens
at
which would make the second eye false; White must block. After
, White can't connect with
at
because of shortage of liberties; and with any other response
captures, preventing the requisite two eyes. Even with the capture and connection of
,
still destroys the eye, so White is dead.
The shortage of liberties threat which follows shortly after at a is the only key to solve this one.
Im sorry, but i think black 1 kill white... if not, can you please show me how white make two eyes there =D
??
ChrisSchack: I believe does it, W answers atari by capturing
and can later fill at (or capture) b.
Jacob4Jesus: I believe kills. If W captures at b a throw-in at
proves the eye is false.
JoelR: No, the throw-in is no good. W recaptures at , and is solidly connected everywhere. Throwing in a stone only works if after the sacrifice is taken off, the opponent cannot make an eye there. Jacob, please read the page RecognizingAnEye, especially the "more accurate alternative".