Beginner Exercise 255 / Solution

Solution.  

The solution is , making miai of a and b.

Main line.  

Specifically, if descends , then and lives.

Be careful, if is greedy and plays at a, then White b removes the second eye.

Variation.  

If makes a placement, then and captures the stone and lives.

Failure 1.  

here is greedy. The placement at makes a and b miai for White.

Failure 2.  

The descent of is also a mistake. After the hane-connect of and , Black does not have enough space to form a second eye at the bottom.