BQM578/Attempt

Black begins; all moves forced.  

The following parenthetical comment is wrong, considering fractic's comments below. (Actually, should be saved as a ko threat; white is already dead.)

Black's throw-in is atari; black wins  

fractic: Not so fast, White can play under the stones too.

White keeps going  

fractic: White gets a ko like this. The In a Korean baduk school page has a link to the actual solution.

Slarty: Nooooooo....

If black captures four stones, White lives  

In the second diagram, if black captures the four white stones immediately, he fails; white takes the corner with an under the stones tesuji.

Dave: I think Black has to increase the sacrifice to yield a better shape.