Beginner Exercise 238 / Solution

Analysis.  

Looks like White has plenty of weaknesses here:

• Black a can capture two White stones and make one eye, but no more.
• Black b makes capturing two White stones at c and making two eyes at d miai.
• Allowing Black to play both e and f capture two White stones.

In particular, how to prevent a Black move at b?

Failure

Failure.  

and seems to do the trick, but makes a and miai, so Black lives.

If at , then Black plays at and lives too.

Solution

Solution.  

The trick is to atari at , which automatically prevents a Black move at a. If connects, then a Black move at b is now useless, and kills.

Solution.  

If , then kills just as well.

Solution.  

Although can capture two White stones, Black has only one eye after .