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Otake Hideo vs Cho Chikun - 2nd Meijin
   

Here is the end position from 2nd game of the 5th Asahi Meijin title match between Otake Hideo and Cho Chikun in 1980. White (Otake) has just resigned because Black managed to invade and live. Does anyone see the path to life?

[Diagram]
Diag.: Black wins by resign

I took a crack at it here, but I am not sure I am correct, anyone else?


[Diagram]
Diag.: The path to life?

It seems to me that black can now cut at 'a' or 'b', and that Black also has a favorable double ko through 8. Am I correct here?

DaveSigaty: It looks like the issue here is what happens after W collapses the Ko by exchanging W9 for B10 and then connects at "b". B has to play "a" so W can push out at "c". B need not let this happen, the problem is B8 here - see below.


[Diagram]
Diag.: Alternative for Black

DaveSigaty: I think that B1 here is stronger than B8 in the diagram above. The immediate threat is to capture the marked stones with a play at 2. If W connects, B3 forces W4, B5 forces W6, and B7 either captures the corner or side.


[Diagram]
Diag.: Ko in the corner?

DaveSigaty: Going back to the beginning. W can also start at 1, I think. B cuts in the corner but it looks like Ko is the most that he can get. This is a very difficult Ko for W to win though since B has many internal threats and nothing on the rest of the board looks big enough. Even if W tries to capture the left side with something like "a", I think B has time to answer.


Noel Herradura: The following diagrams were taken from the HnG games discussion at [ext] http://www.bb.wakwak.com/%7Etsuchiya/golax/hikaru/ .

[Diagram]
Diag.: Path to life

[Diagram]
Diag.: Path to life continued

Noel Herradura: The marked stones are effectively killed.

Yes, but what happens if white plays the marked stone as 7? All white need do is deny black an eye, not kill asap. --BlueWyvern

DaveSigaty: Let's see!


[Diagram]
Diag.: When in doubt - read it out!

DaveSigaty: Connecting at the marked stone instead of "a" probably represents W's strongest resistence. However, after the sequence shown above, B forces once at 1 then stops W pushing out with 3. If 4 (note that 4 at "b" is answered by B "c"), drawing back with 5 looks best for B. W can capture a stone with 6 but when B bends around with 7, W is trapped. W can struggle a bit more but can not break out.


[Diagram]
Diag.: When in doubt - read it out! (2)


This is a copy of the living page "Otake Hideo vs Cho Chikun - 2nd Meijin" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.