TsumegoFromGames101/ Solution

Sub-page of TsumegoFromGames101
[Diagram]
Miai  

Chris Hayashida: W1 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]
Alive  

Chris Hayashida: First, the easy case. If B1, then W2 makes a second eye.

[Diagram]
Alive, but White might lose two stones  

If Black plays B1 instead, then it's more complicated. White ataris at W2, forcing B3. After that, White has the first L+1 group. White plays W4 to make life.

[Diagram]
Dead  

If White tries to save the two stones, Black plays B3. 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]
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]
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 B6 at B8? Zook: See [1].

[Diagram]
Life  

W1 captures two stones. If Black throws in, White captures his stones by pushing through at W3.


[1]

[Diagram]
Bent four, but enough liberties  

Zook: If B1 here (instead of B6 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]
The problem  

Zook: If B3 at W4, I suddenly find a problem. Still thinking ...

Chris Hayashida: I updated this diagram to show Zook's problem. B3 and B5 falsify White's second eye. W4 and B5 can be swapped, and the eye is still false.

[Diagram]
Miai  

Yeah, White has to start at W1 here after exchanging the alleged marked miai!

[Diagram]
Miai  

Chris Hayashida: What if Black plays at B1 the critical point? White cannot immediate play at b. W2 makes a and b become miai for life.


TsumegoFromGames101/ Solution last edited by Kuolema on May 12, 2005 - 19:47
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