Kyu Exercise 23 / Solution

Solution  

White wins the capturing race on the right with two liberties. Note that black can't play on any three of white's middle-group liberties, as they're all self-atari.

Failure

Pyrrhic victory  

looks like a solution, but it fails on the right: White needs 4 moves more to kill Black's right group, while Black needs 4 moves to kill White's right group, and next play is Black's.

Complete Failure  

(or a) fails to (or b). Then White cannot approach further in the center because of self-atari. Black needs two more moves to capture while White gets only the marked stone.

Not fast enough  

White playing from the left gains nothing relevant, not even the left Black group, even when using the ko-play .