Kanazawa Problem 20 / Solution
The vital point
![[Diagram]](../../diagrams/18/b5fe97990c29ed6aba861bc69920f9c8.png) | Black lives |
Starting at the 1-2 point to prevent White from linking up, and simultaneously occupying a vital point, is pretty obvious.
Main line
![[Diagram]](../../diagrams/34/b211a9ff00486ddca58c9710ee9d3d7c.png) | Main line |
White's stiffest resistance is to play and . is a nice tesuji using the special properties of the corner. If White captures two stones at a ...
![[Diagram]](../../diagrams/1/27029b9626bfdc6856f07c99c3edaa71.png) | Continuation |
... Black recaptures at !! If White now connects her stones at , creates shortage of liberties. Note the liberty at the circled point, without which Black would not be able to execute this tesuji, since would be self-atari.
Variations
![[Diagram]](../../diagrams/32/1ffa7114cc6328033f4637e6c5e7bf92.png) | Variation at 8 |
If at here, is just in time to capture the lot without ko. Once again the circled liberty is necessary to make that possible.
![[Diagram]](../../diagrams/12/0863d02f2651d7174a558e98deabc676.png) | Variation at 4 |
If here, makes seki. If White adds another move at a or b, she almost fills Black's eyespace with one of the bent four shapes that give life.
![[Diagram]](../../diagrams/27/d799b2f9711a1b605dbe527d88f46147.png) | Variation at 2 |
If White takes the other 1-2 point, and destroys the eyeshape with , makes life. at a makes a seki in gote.
Failures
![[Diagram]](../../diagrams/48/89ab5886c5531156c355603b32a938bf.png) | Mistake at 3 |
If Black fails to see the tesuji, and falls for the temptation to occupy both 1-2 points instead, creates a ten thousand year ko. Note: in case the tesuji mentioned above doesn't work, since the liberty at the circled point is filled, this is Black's best option.
![[Diagram]](../../diagrams/5/c0665a9fe5805b66b4ae81312845f938.png) | Mistake at 1 |
The only other option we have to investigate is here: it also prevents White from linking up, and if it worked, it would perhaps make more points than the correct answer. We will make this another problem: Kanazawa Problem 20 b.
Contributors
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"Kanazawa Problem 20 / Solution" at
Sensei's Library.
2004 the Authors, published under the OpenContent License V1.0.
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