Beginner Exercise 252 / Solution

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Not a ko-threat.  

W1 is not a ko-threat.

Variation 1.  

If W1, then B2 blocks. Then if W3, then B4 is an atari, and then B6 connects.

togo: This obviously only works because there is an additional freedom at a.

Variation 2.  

The tricky move is W1. However, B2 solves the problem. Subsequently, if White a cuts the Black stones, then the atari at b transposes back to Variation 1.

Variation 2, Black mistake.  

The Black move at B2 is a mistake. Now, after W3, Black cannot avoid the ko at a. Even if B4 pushes, W5 can block, and then a Black move at b will be self-atari, so the ko still cannot be avoided.

Beginner Exercise 252 / Solution last edited by togo on November 4, 2012 - 13:19
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