Gokyo Shumyo, Section 1, Problem 88 / Attempts

What if ...  

Continued at ^[1].

Dieter

Hmm... I failed to notice this one. I will try again some other time.

Timing?  

Does waiting until this point to play make miai of the left and the right? White at (the key point in the previous try) no longer seems to work.

6 at  

Oops! recaptures and ends the threat on the right while keeping in shortage of liberties.

Ko  

So White has to play here and Black makes ko with . Note that a can be used as a local ko threat.

No need to defend everything.  

One eye for White.

Another attempt  

Q: Why not start with the key point here?

A: Because Black plays .

What if...  

Dave: This looks about right for the play at . As dnerra shows above, this move by itself is not enough to live. The timing must be right, when Black is fully committed on the left. Let's see what the official solution is. Does White have something better? Even if she does, this has been an interesting analysis.

Dieter: This is the main line as given by Hashimoto Utaro. I'm a bit puzzled why all of a sudden the solution is a ko. There is definitely a ko section later in the book. Well it is a good thing, for now we can't even be sure any more of the kind of solution we're looking for in the next problems.

Yet another line  

at , at .

But it's indisputable that the ko in unkx80's solution is better. What an intriguing problem!

unkx80: I am not sure this is yet another line. What if plays at instead?