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KanazawaProblem52

 

Kanazawa Solution 52
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    Keywords: Problem

This is a really tough tsumego problem with a main line of 17 moves.

[Diagram]
Solution

The challenge is to make an eye at the marked point, and still keep time to make one in the corner. This is no easy task, because Black needs two moves to turn the marked point into a real eye; and a White move at a destroys any eye potential in the corner. On the other hand, Black can threaten to capture the circled stones, to break through the squared ones or to make two eyes in the corner. With these weapons, Black has to find the proper order of moves to live.


[Diagram]
Main line

[Diagram]
Continuation

After 17, White suffers from damezumari, that is, Black can play as in the following diagram:


[Diagram]
Continuation

White captures the marked stone, but Black plays 2 and White can't connect at a or she loses five stones.



Now for some variations, backtracking from 17 to 1.


[Diagram]
Variation at move 15

In response to the marked stone (White 14) it is tempting to capture at 1, but White connects at 2 and leaves Black with two false eyes in the corner.



[Diagram]
Variation at move 14

If White 14 at 1 in this diagram, then Black plays 2 (can also be at a). After 3 and 4, White can't play at a, again because of damezumari.



[Diagram]
Variation at 8

After Black 7 (the marked stone), the natural White response seems White at 1 here. In any case, it is the vital point. But White 1 is trapped already, and Black has time to make his second eye with 2 and 4.

Of course, if White prevents that second eye, Black makes two eyes in the corner, playing 1 himself.



[Diagram]
Variation at 6

What if White at 6 ignores the marked atari and destroys the eye potential in the corner rightaway with 1 here ?

Black makes the usual exchange 2 for 3, then captures at 4. This makes miai of a and b. the play at a clearly makes a second eye, and b in its turn makes miai of c and d.

As a sidenote, the timing of the forcing move at 2 seems arbitrary to me, so if you have thoughts on that one, please explain.



The whole meaning of 1 and 3 in the main line is to get 5 in place in sente. This stone serves amongst other things to prevent a connection underneath, as demonstrated in the "variation at 8".

[Diagram]
Failure at 1

If Black immediately plays 1, White defends at 2, in the process destroying the eye potential there. Now Black has to make two eyes in the corner, which he can't.



[Diagram]
Failure (ii) at 1

Black 1 is vulgar. It destroys the possibilities and White defends at 2 with good aji. The move at 3 is still forcing, but now Black has run out of resources. White strikes at the vital point at 6 and makes miai of a and b.



[Diagram]
Failure (iii) at 1

Now how about seeking life in the corner immediately ? White 2 destroys the eye above and even after 3, Black doesn't have two eyes in the corner.


[Diagram]
Variation

Now a and b are miai.



[Diagram]
Variation

Incidentally, Black 1 seems to work too: if a, then b makes an eye in sente. If tenuki from the corner then also life ? (To be continued.)



DieterVerhofstadt


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This is a copy of the living page "Kanazawa Solution 52" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.