Now and are miai for the protection of the second eye.
Once the vital point has been played ( in the solution diagram) there is not much room for mistakes by White, so we will concentrate on what can go wrong at the first move.
is a natural move. But up to , a and b are left as miai for the kill.
Here and are miai: up to is one way for White to die.
The 1-2 point is another natural point to try, to make life, but Black can occupy , which is connected to the marked stone through a large monkey jump.