GokyoShumyoSection1Problem100/Solution

[Diagram]
Common line - forced moves  

W1-B2 is forced. It's easy to verify that allowing White to play at B2 makes life. Next, B3 is tesuji, making miai of a and b.



The corner tesuji

[Diagram]
Life  

W2 wedges and then W4 is a splendid move. Whatever Black does, W8 will do the trick. If Black plays the shape point B9, then W10 is atari and next White lives at a. If Black responds to W8 at W10, then White can play B9 and make two eyes at b or c.



The center sequence

[Diagram]
Life  

If B2 defends on the left, then after W9, Black has a problem. White can play at a to get an eye at b or capture black, or at c to capture either black B4 or black B6. See next diagram

[Diagram]
Continuation  

After W9 white threatens a capture on the left and a ladder on the right.


Variations

[Diagram]
Variation 1  
[Diagram]
Variation 1 (ctd)  
[Diagram]
Variation 2  
[Diagram]
Variation 3  

Black gets caught in net. ignoring 5 does not lead to ko as white will force eye at 'a'

[Diagram]
Variation 4  

GokyoShumyoSection1Problem100/Solution last edited by Dieter on March 30, 2022 - 19:13
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