28th Meijin Game 5 Life and Death Problem Solution
Keywords: Problem
![[Diagram]](../../diagrams/39/0e9a0d1ee59d9dd13a2093769f2d7b17.png) | Miai |
Chris Hayashida: makes one eye in the upper left corner. At this point, a and b become miai for a second eye.
After reading the discussion below, it sounds more like b and c are miai for the second eye.
c is the vital point for the first L+1 group.
![[Diagram]](../../diagrams/33/fdeaeb2ae9fdcf8f60a1c6ccf39a03e1.png) | Alive |
Chris Hayashida: First, the easy case. If , then makes a second eye.
![[Diagram]](../../diagrams/51/3aa030aced6a3e2cf872fd170f9defd1.png) | Alive, but White might lose two stones |
If Black plays instead, then it's more complicated. White ataris at , forcing . After that, White has the first L+1 group. White plays to make life.
![[Diagram]](../../diagrams/52/d138f8ebf06253b23188182653133003.png) | Dead |
If White tries to save the two stones, Black plays . White is left with a dead L group. It would have been better to sacrifice the two marked stones so that the whole group doesn't die.
![[Diagram]](../../diagrams/14/ca2dc66b471f83cfa8427c4cbaadb334.png) | Miai |
Zook: I think this is an interesting variation too. At first sight, it looks as if a and b are miai to kill the outer eye and White is still left with a L-group in the corner. However, there are weaknesses in Black's position.
![[Diagram]](../../diagrams/32/8b29e0c6848d322385f95547b1fded82.png) | L-group |
White now opens one of the variations in the L-group to make use of the weakness at the circled point.
someone: Question: what if at ?
Zook: See [1].
![[Diagram]](../../diagrams/21/cb933f4ba5f5cbeeb396d1af0c0f34cf.png) | Life |
captures two stones. If Black throws in, White captures his stones by pushing through at .
[1]
![[Diagram]](../../diagrams/16/a66f1ab5b57d06f81eade5a3cf257c41.png) | Bent four, but enough liberties |
Zook: If here (instead of two diagrams earlier above), this is basically a variation discussed at bent four in the corner (check that page). White has enough outside liberties to avoid the ko.
![[Diagram]](../../diagrams/28/05b684f4873761f9e72aebe6ab69d86a.png) | The problem |
Zook: If at , I suddenly find a problem. Still thinking ...
Chris Hayashida: I updated this diagram to show Zook's problem. and falsify White's second eye. and can be swapped, and the eye is still false.
![[Diagram]](../../diagrams/0/8fd89dfca2ec02cd097a9643848a0121.png) | Miai |
Yeah, White has to start at here after exchanging the alleged marked miai!
![[Diagram]](../../diagrams/50/b82c21bbfe72894e144c46fc0ce01901.png) | Miai |
Chris Hayashida: What if Black plays at the critical point? White cannot immediate play at b. makes a and b become miai for life.
This is a copy of the living page
"28th Meijin Game 5 Life and Death Problem Solution" at
Sensei's Library.
2003 the Authors, published under the OpenContent License V1.0.
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