Kyu Exercise 6 / Discussion

Sub-page of KyuExercise6

Karl Knechtel:

White first to kill  

The marked space is only good for one eye with White's stone placed as it is. White must prevent Black from making two eyes immediately with a play at W1, so the first move is obvious.

White first to kill  

If Black tries to solidify an eye on the bottom, W3 is double atari and will capture and destroy an eye, leaving black dead.

unkx80: Apart from HolIgor's comments below, think also how B2 should defend. If you play B2 as in your diagram, W3 can play tenuki; that is, B2 actually dies in gote.

You mean the diagram beside this text I assume? It seems that if W3 plays tenuki, B4 at W3 makes an eye out of the space at the top, and the four in a row on bottom should make a second eye, with White unable to connect the stranded stone.

unkx80: Yes, I mean the diagram beside this text. Hint: See also my comment below.

White first to kill  

If Black tries to solidify an eye at the top, W3 will cut, putting the marked stone in atari. Black cannot connect at a because of shortage of liberties, and will not be able to make an eye on the bottom.

HolIgor: If B4?

White first to kill  

Oops. How about this way? White must be careful not to fill in at move W7, since B8 at W7 would capture. B4 and B6 can be interchanged. After Black captures 2 stones...

unkx80: Actually W5 can play tenuki.

White first to kill  

... White recaptures and Black has no eye at the bottom.

Alternatives for White?  

Juha: After B2, couldn't White's next move be on any of the three marked points?

unkx80: Yes.

If black goes first, could he ignore making the two eyes at 2?  

jgomo3?: I'm asking because it seems black gain more territory than just play at 2.

Uberdude Yes, that lives with more points so will usually be the best move to live for black. It is good that you don't just look to live, but how to live with the most profit. However, there is a downside: it gives white quite a few ko threats to kill the group so if there is the possibility of a big ko in the future it might be better to make the 2 eyes with fewer points to not give white the ko threats.

Kyu Exercise 6 / Discussion last edited by on September 11, 2010 - 19:59
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