RTG Problem 39 / Solution

 

pwaldron: Black starts by descending. Playing at a is not so good as it gives the possibility of a ko in the corner.

 

At this point, White may think he has a shot, but...

 

...black kills the eye in he corner with an under-the-stones tesuji. White has to look to the left for a second eye.

 

Note that at a won't work. White can get a second eye with his own under-the-stones.

 

A final under-the-stones tesuji destroys White's last chance.

 

unkx80: If connects, then is the way to kill. Next, a and b are miai, so the left side becomes a temporary seki but the right side has only one eye, so White is still dead.

Bill: That makes it a false seki.

 

MrTenuki: Another variation.