Kanazawa Problem 20b solution
Keywords: Life & Death, Problem
Main line
![[Diagram]](../../diagrams/19/b881508a033c2f70e5ba7befe2baf475.png) | Main line |
is the only move. The only correct answer for Black is at . White's correct answer is at , and note that White must capture the black stone at , resulting in ten thousand year ko.
Variations
![[Diagram]](../../diagrams/50/1ddad2be22dc3d3675be8753347144bb.png) | Variation at 2 |
This dies easily.
![[Diagram]](../../diagrams/30/4fb957770f92034792ecacdc3e29bcca.png) | Variation (ii) at 2 |
Death in bulky five. If Black continues with atari at a, White simply connects at .
![[Diagram]](../../diagrams/1/6ec484c5f151fb1b09c2221a4b4b07d9.png) | Variation (iii) at 2 |
After , a and b are miai.
![[Diagram]](../../diagrams/7/7e1afcbbe60d3f001cd4882b107ee65f.png) | Variation (iv) at 2 |
Resistance at is useless here.
![[Diagram]](../../diagrams/9/268b4d060e33d9784afc087ce1bdf9f5.png) | Variation (v) at 2 |
The black group dies as well: a and b are miai.
Failure
![[Diagram]](../../diagrams/19/06a434fc9605af0006aa0498285a73bb.png) | Mistake at 3 |
If White plays at here, Black lives in seki: either he makes seki at a, or if White plays there, Black can capture her bent four in timely fashion.
![[Diagram]](../../diagrams/52/c6b80fd7a496f9b5997f04517f8ea14b.png) | Mistake at 1 |
With the clamp at , Black lives.
![[Diagram]](../../diagrams/42/d47443fb6782ca245959e148a0458b0a.png) | continuation |
If White plays at a to prevent a seki, then Black plays at b to form a bent four live group.
After (oshitsubushi), White is short of liberties and cannot play at to form a bulky five, so Black lives.
![[Diagram]](../../diagrams/36/8379507b3c4f4d5df57fe5b95141a598.png) | Variation after the mistake |
White 4 here doesn't work... after , White is caught in a connect-and-die.
![[Diagram]](../../diagrams/29/032a784388241be1efdd63b47675e80b.png) | Another variation |
Same fate here if White chooses to take the ko at instead.
Mistake upon mistake upon mistake
![[Diagram]](../../diagrams/38/52942ec34654f26b7b6f3d747e784f74.png) | MMM |
In KanazawaProblem20 was already a mistake. White's hane - as we now know - is another one and then is yet another one.
makes miai of a and b: b would enable White to almost fill Black's eye space with a bulky five and White a would make an eye inside Black's group. If Black rushes to capture White's stones, he's left with a farmer's hat space inside his group.
KarlKnechtel (~14k)
Can't Black also live by escaping with a monkey jump in this case?
![[Diagram]](../../diagrams/13/5cf2b10c4760da0a517908a3593091a7.png) | Escape? |
![[Diagram]](../../diagrams/15/c94ea1c6df1b99eb9735a547e0018197.png) | Escape? |
No escape. --unkx80
Contributors
This is a copy of the living page
"Kanazawa Problem 20b solution" at
Sensei's Library.
2004 the Authors, published under the OpenContent License V1.0.
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