White makes two eyes with one strike. There is an eye at each circled point.
The main line just shows the completion of the first eye.
Now and
are miai for the protection of the second eye.
If the circled liberties at a and b were filled, Black could kill this way.
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.
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