RTG Problem 6 / Attempts

White to play.  

ChrisSchack: I think the first move has to be here, it seems like the vital point. It's both a peep at a and the eye-stealing tesuji in conjunction with b.

B fails to connect  

W has 4 liberties to 2 (maybe 3 to 2 for other placements of 1) and kills the cut stones, and with them the group.

White steals the second eye  

Now W just has to connect out, and unless B plays a sagari, W simply pushes through.

Black descends  

And in this case, the stones are cut off and die.