It is important to atari the stone in the correct direction.
If here, then after
, the
stone is captured.
Under the stones - wishful thinking
Players who know the under the stones technique may be tempted to think of this more convoluted solution. Alas, this line is wishful thinking - see Under The Stones Problem 6 for the reason.
Note the tesuji of that forces Black to make an additional approach move.