Gokyo Shumyo, Section 1, Problem 35 / Solution

White lives  

involves some sacrifice tactics.

Main line  

White sacrifices , and then makes two eyes by capturing and , leaving the marked stones unprotected (Black can play at a later on, to capture them in a snapback). Note that White's liberty at b is crucial; if not for it, at c prevents . See J-group#straight J-group.

Mistake at move 7  

White dies in gote, the worst of all events, because Black can almost fill White's eyespace with a bulky five at any time.

This is the sort of bad move that could be in the (imaginary) book Get Strong At Gote.

Mistake at move 5  

At move 5, if White gives atari with , Black can start a ko at a or b.

Mistake at the first move  

Simply connecting is not good enough. After , Black will be able to almost fill White's eyespace with a killing shape.

Mistake 2 at the first move  

is a move that may come to mind. Black grabs the vital point at . If , then blocks on the outside. If White plays at a to prevent the snapback, he dies in gote.

Mistake 3 at the first move  

After , White is dead because a and b are miai for Black.