Dieter's ABC of mistakes - 12

Knotwilg · Post by **Knotwilg** » Tue Apr 13, 2021 8:27 am

Click Here To Show Diagram Code: [go]$$Bc Mistake 12 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X X O . O . . . . . . . . | $$ | . . X X O O O X . . . X X O . . . . . | $$ | . . O O X . . X X O O O X . . O . . . | $$ | . . X X X O O X O O X X X X . . O . . | $$ | . . O O O O X X O X O O . . . X X . . | $$ | . . O X O X X O O X . . . . . . . . . | $$ | . . . X X O O O . X O . O X . . . . . | $$ | . O O X . X O O O X . O X X . X X . . | $$ | . . X , X X X O X , . O O . . X O . . | $$ | . O X X O . O X X X . . . O . O O . . | $$ | . . O O . O O O O X . . X O . O . . . | $$ | . . . . O . X X . X . X X X X X O . . | $$ | . . O O . . O X . X . . O . . . O . . | $$ | . . X . . X O O O O . X O . . . . . . | $$ | . . . X . . . . . X . . O X X X X X . | $$ | . . . . . X . O . . . . O X O O O X . | $$ | . . . . . . . . . . . O . O . . . O . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Black was a little confused here. Take a good look: where would you play?

jlt · Post by **jlt** » Tue Apr 13, 2021 10:13 am

If I counted correctly, both Black and White have four liberties so Black wins the capturing race.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . 7 6 3 8 . . . . . . . . | $$ | . . . . X X X X O 1 O 9 . . . . . . . | $$ | . . X X O O O X 4 2 5 X X O . . . . . | $$ | . . O O X . . X X O O O X . . O . . . | $$ | . . X X X O O X O O X X X X . . O . . | $$ | . . O O O O X X O X O O . . . X X . . | $$ | . . O X O X X O O X . . . . . . . . . | $$ | . . . X X O O O . X O . O X . . . . . | $$ | . O O X . X O O O X . O X X . X X . . | $$ | . . X , X X X O X , . O O . . X O . . | $$ | . O X X O . O X X X . . . O . O O . . | $$ | . . O O . O O O O X . . X O . O . . . | $$ | . . . . O . X X . X . X X X X X O . . | $$ | . . O O . . O X . X . . O . . . O . . | $$ | . . X . . X O O O O . X O . . . . . . | $$ | . . . X . . . . . X . . O X X X X X . | $$ | . . . . . X . O . . . . O X O O O X . | $$ | . . . . . . . . . . . O . O . . . O . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

So the game may proceed like this:

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X X O 1 O . . . . . . . . | $$ | . . X X O O O X . 5 3 X X O . . . . . | $$ | . . O O X . . X X O O O X . . O . . . | $$ | . . X X X O O X O O X X X X . . O . . | $$ | . . O O O O X X O X O O . . . X X . . | $$ | . . O X O X X O O X . . . . . . . . . | $$ | . . . X X O O O 7 X O . O X . . . . . | $$ | . O O X . X O O O X . O X X . X X . . | $$ | . 4 X 6 X X X O X , . O O . . X O . . | $$ | . O X X O 2 O X X X . . . O . O O . . | $$ | . . O O . O O O O X . . X O . O . . . | $$ | . . . . O . X X . X . X X X X X O . . | $$ | . . O O . . O X . X . . O . . . O . . | $$ | . . X . . X O O O O . X O . . . . . . | $$ | . . . X . . . . . X . . O X X X X X . | $$ | . . . . . X . O . . . . O X O O O X . | $$ | . . . . . . . . . . . O . O . . . O . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

pwaldron · Post by **pwaldron** » Thu Apr 15, 2021 11:03 am

Click Here To Show Diagram Code: [go]$$Bc Mistake 12 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X X O a O . . . . . . . . | $$ | . . X X O O O X . a . X X O . . . . . | $$ | . . O O X . . X X O O O X . . O . . . | $$ | . . X X X O O X O O X X X X . . O . . | $$ | . . O O O O X X O X O O . . . X X . . | $$ | . . O X O X X O O X . . . . . . . . . | $$ | . . . X X O O O . X O . O X . . . . . | $$ | . O O X . X O O O X . O X X . X X . . | $$ | . . X , X X X O X , . O O . . X O . . | $$ | . O X X O . O X X X . . . O . O O . . | $$ | . . O O . O O O O X . . X O . O . . . | $$ | . . . . O . X X . X . X X X X X O . . | $$ | . . O O . . O X . X . . O . . . O . . | $$ | . . X . . X O O O O . X O . . . . . . | $$ | . . . X . . . . . X . . O X X X X X . | $$ | . . . . . X . O . . . . O X O O O X . | $$ | . . . . . . . . . . . O . O . . . O . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Either move marked 'a' looks to be good to capture the group. The tesuji books would probably go for the second line version.

jlt · Post by **jlt** » Fri Apr 30, 2021 1:39 am

I knew I had seen that problem before. This is in "Graded go problems for dan players, volume 2".

Life In 19x19