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 Post subject: tesuji question
Post #1 Posted: Thu Mar 26, 2020 2:08 pm 
Lives with ko

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KGS: phillip19
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

the recommended move in this position is b1.
then white follows d2, then black c1, then white a2 then black b3,
then white is forced b4, then black h2, white j2 and finally black h1, securing his group.
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . 6 O O . . . . . . . . . . . . . . . |
$$ | . 5 O X X X . O . . . . . . . . . . . |
$$ | 4 O X 2 O X . 7 8 . . . . . . . . . . |
$$ | . 1 3 . . . . 9 . . . . . . . . . . . |
$$ ---------------------------------------[/go]

my question is, instead of 2 at d2,
how about at b3?
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . 2 O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . . . . . . . . . . . . . |
$$ | . 1 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

now white still only has one eye and i don t see a good way of making a second.
for example
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . O O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . 1 2 . . . . . . . . . . |
$$ | . X . . . 4 . 3 . . . . . . . . . . . |
$$ ---------------------------------------[/go]

here how can black force two eyes?

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 Post subject: Re: tesuji question
Post #2 Posted: Thu Mar 26, 2020 2:37 pm 
Oza
User avatar

Posts: 2223
Location: Tokyo, Japan
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KGS: ez4u
phillip1882 wrote:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

the recommended move in this position is b1.
then white follows d2, then black c1, then white a2 then black b3,
then white is forced b4, then black h2, white j2 and finally black h1, securing his group.
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . 6 O O . . . . . . . . . . . . . . . |
$$ | . 5 O X X X . O . . . . . . . . . . . |
$$ | 4 O X 2 O X . 7 8 . . . . . . . . . . |
$$ | . 1 3 . . . . 9 . . . . . . . . . . . |
$$ ---------------------------------------[/go]

my question is, instead of 2 at d2,
how about at b3?
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . 2 O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . . . . . . . . . . . . . |
$$ | . 1 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

now white still only has one eye and i don t see a good way of making a second.
for example
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . O O X X X . O . . . . . . . . . . . |
$$ | . O X . O X . 1 2 . . . . . . . . . . |
$$ | . X . . . 4 . 3 . . . . . . . . . . . |
$$ ---------------------------------------[/go]

here how can black force two eyes?

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . O O X X X 5 O a . . . . . . . . . . |
$$ | . O X . O X . 1 2 . . . . . . . . . . |
$$ | . X . . . 4 . 3 . . . . . . . . . . . |
$$ ---------------------------------------[/go]

:b5: is the perhaps the most thematic play, since Black tries to create the largest internal space. We have to notice that the play also threatens to atari at "a" and capture :w2:. Can you read out how things might developed from here?

_________________
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"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21

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 Post subject: Re: tesuji question
Post #3 Posted: Thu Mar 26, 2020 2:41 pm 
Lives with ko

Posts: 233
Liked others: 3
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KGS: phillip19
thanks the problem was bugging the hell out of me.

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 Post subject: Re: tesuji question
Post #4 Posted: Thu Mar 26, 2020 5:20 pm 
Honinbo

Posts: 9522
Liked others: 3005
Was liked: 3166
Dear Eagle Eye,

How about this?

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


Which leads to a difficult fight, like maybe this.

Click Here To Show Diagram Code
[go]$$Wcm10 Ko
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . , . . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . . O O . . . . 5 . . . . . . . . . . |
$$ | . O O X X X O O 4 1 6 . . . . . . . . |
$$ | . O X . O X X X O X 3 . . . . . . . . |
$$ | . X . . . O . X 2 . . . . . . . . . . |
$$ ---------------------------------------[/go]


You may well have found a flaw in this problem. :) :clap:

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At some point, doesn't thinking have to go on?
— Winona Adkins
----
Many are cold, but few are frozen.

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