Beginner Exercise 89 / Solution

Sub-page of BeginnerExercise89
White dies  

If White pushes at a, Black responds at b.

This is my first solution, hope I got it right... -phooky

lavalyn: Excellent work. Except that Black need not respond to a or b - either play by White and she dies in gote. Notice that to capture the three black stones requires both a and b - at which point she has only one liberty left. Thus White dies in shortage of liberties.

demetria wonders: Wouldn't white be more likely to respond with W2 at B3. Also wouldn't black answer the original W2 by setting up the ko first?

Roger is confused. Sorry if I'm just a newb, but I don't see how Black can actually make the kill, if White plays at 'b'? Any move Black makes will get his center stones killed. The only option I can see is for him to go for a ko fight at e1.

Shortage of liberties  

Dan: Here is the situation after White plays at b in the previous diagram. As you said, Black dies if he makes a move... so he tenukis. White can't approach on either side (at a or b) without putting his own stones in atari. Eventually B could play at c and d (waiting until there are no ko threats if necessary) and pick up the White group, so it is not seki.

xela: If you understand why bent four in the corner is dead, then the same ideas apply here.

Bill: It's worse than that. In theory, bent four could be fought with ko threats. Here, no finite number of ko threats helps White, as Black could exhaust White of them. The parallel is with moonshine life.

How about this?  

I think this is a reasonable response that would leave white with only false eyes. White might be able to live with a very small eye if it takes B5 first, but it looks like there'd be too little to gain.


B1 is atari.

White gets a ko  

Quacki: I thought about this B5 to be the solution, but white gets a ko after this one (Which I did not see until after I saw the solution).

Beginner Exercise 89 / Solution last edited by on June 7, 2005 - 03:23
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