Keywords: Ko, Question

black: klaus (alias: (sabaki)) hopefully 1kyu
white: Jensen J (alias: (Finger Nail)) 3dan Komi 6.5

initial position  

White just played white+circle. Feeling, that I might be behind (as I alway do against stronger opponents...) I decided to start a ko sequence.

Charles Problem for Black: White has quite a thick overall position. So, not a great time to start a ko.

The indirect strategy of stirring up some trouble first is more suitable, in this case.

Possibly Black can play the right side in some way that yields some ko threats: and then go ahead.

For example, Black at the circled point: this looks like a good start.

Intended sequence 1  

After B1 and W2, I intended to find one single ko threat! B3 was my try, which I assumed, it might kill a big white group...

Intended sequence 2  

If white responds to black+circle, I intended to take the ko, and ignore any threat, If white dares to play one.

This would result in a big loss locally, so I calculated the following white response at W2. After that, black+square still has useful aji at a.

However, my opponent ignored the threat!

Actual game  

After I connected at B9, Jensen started another Ko with W0, (assuming Black a, White b, Black c, which has not been played yet.

The game is still going on, so no suggestions for the actual position please! (later...)

Here are my "big" questions:

  • Was B1 in "Intended sequence 1" a mistake? Should Black have connected in the first place?
  • Did I have an other ko threat on the rest oft the board, big enough to make white react?
  • Did I have a different threat in the lower right, treatening to kill for sure?
  • Was my assumption, that I can ignore any ko threat on the board correct?
  • Did I play the right sequence, after White ignored my threat?
  • Was White right to ignore my threat? (Might be discussed later, when I feel free to analyse the game situation.)

initial position  

SnotNose: Isn't a a local ko threat for Black?

Even if White ends up capturing black+circle, if Black can cut at b or c and also get plays around the circled points, black will have a nice center, no? There may be tactical flaws in my thinking that will get pointed out, no doubt. But, it is clear that a is a key point here. If White gets it, then she has no worries for her center stones. If Black gets it, he at least gets some leverage to buld up the center.

Local threat!  

Klaus: Nice idea! I guess, I sequence like this will not be satisfying for White. If White can't answer at W2, he is having problems.

Local threat! 2  

So this is a likely result. black+circle is captured without White defending at a, so White has gained a move and the aji of black+circle is gone.

However, Black might play tenuki; and b can be answered at c. Who is ahead in this case?

Bill: Here is a thought. It achieves a result similar to (though not as good as) the intended sequence without fighting the ko.


If W2 at 3, B3 at 2. :-)

"break out" problem (1)  

tderz: The position reminds me of this very analogue to a standard problem in the "defense" sect. of Shuko's tesuji dictionary.

"break out" problem (2), W's mistake  

B3 is double atari

(3) "break out" problem, a vulgar atari  

atari B1 is vulgar, Wa, Bb

(4) tesuji for "break out"  

After W6, Black has Baff for easy shape.

Question on creating SL diagrams moved to Guinea Pigs Feedback.

BQM119 last edited by ProtoDeuteric on April 8, 2005 - 09:57
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