This is the most direct solution. and reduces black's liberties and forces and to capture the four white stones.
is yet another solution. After , if black plays at a, black puts himself into self-atari. It is also possible to reverse the order of and .
However, directly kills. and are now miai. In the end, whether is a white stone or a black stone, we still have at least two solutions.
What I had wanted to illustrate in this problem is the technique in Solution 1, which is to force black to capture the white stones and thereby reducing his eye space into one of the killable eye shapes.