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Offline hakuseki
 Post subject: hakuseki's problem collection
Post #1 Posted: Fri Apr 22, 2022 9:09 am 
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I hope I will be forgiven for starting another study journal when I already have one. Here I will only post problems. The focus is not on super hard problems, but on problems that I feel I should have gotten right but missed. All problems will be black to play.

Problem 1
Source: Game against KataGo

Go Diagram
Black to fix
Click Here To Show Diagram Code
[go]$$Wc Black to fix
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O X . . . . . . . . . . . |
$$ | . . . . O X X O X X X 1 . O . . . . . |
$$ | . . . O . X . O O O O . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O X . 1 . . . . . . . . . |
$$ | . . . . O X X O X X X O . O . . . . . |
$$ | . . . O . X . O O O O . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]

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Offline hakuseki
 Post subject: Re: hakuseki's problem collection
Post #2 Posted: Fri Apr 22, 2022 9:19 am 
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Problem 2
Source: 初段になれる詰碁　p.211

Go Diagram
Black to live
Click Here To Show Diagram Code
[go]$$Bc Black to live
$$ | . . . . . . . . .
$$ | . O . . . . . . .
$$ | . . . . . . . . .
$$ | . O O O . . . . .
$$ | O X X X O O O O .
$$ | . . X O X X X O .
$$ | . . . O . . . . .
$$ --------------------[/go]


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


Last edited by hakuseki on Sat Apr 23, 2022 6:09 am, edited 1 time in total.
This post by hakuseki was liked by 2 people: Harleqin, le_4TC
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Offline hakuseki
 Post subject: Re: hakuseki's problem collection
Post #3 Posted: Fri Apr 22, 2022 3:53 pm 
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Problem 3
Source: 初段になれる詰碁 p.219

Go Diagram
Black to move
Click Here To Show Diagram Code
[go]$$Bc Black to move
$$ | . . . . . . . . . .
$$ | . . O . . . . . . .
$$ | . O . O O O O . . .
$$ | . O X X X X . . . .
$$ | . X X O O X O O . .
$$ | . . . O X O . . O .
$$ | . . . . . . . . . .
$$ ----------------------[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | . . O . . . . . . .
$$ | . O . O O O O . . .
$$ | . O X X X X . . . .
$$ | . X X O O X O O . .
$$ | 6 . 3 O X O . . O .
$$ | . 5 4 1 2 . . . . .
$$ ----------------------[/go]
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Offline hakuseki
 Post subject: Re: hakuseki's problem collection
Post #4 Posted: Sat Apr 23, 2022 6:22 am 
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Problem 4
Source: ひと目の手筋 p.301

Go Diagram
Black to play
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . . . . . . . . . . . |
$$ . . O . . O . O O X . . |
$$ . . . . . . . O X X . . |
$$ . O , . . . O X O X . . |
$$ . . . . . . . X O X . . |
$$ . . . . . . . . O . . . |
$$ . . . . . . . . . . . . |
$$ ------------------------[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . . . . . . . . . . . |
$$ . . O . . O . O O X . . |
$$ . . . . . . . O X X . . |
$$ . O , . . . O X O X . . |
$$ . . . . . . . X O X . . |
$$ . . . . . . 1 . O . . . |
$$ . . . . . . . . . . . . |
$$ ------------------------[/go]
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Offline hakuseki
 Post subject: Re: hakuseki's problem collection
Post #5 Posted: Sat Apr 23, 2022 6:35 am 
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Problem 5
Source: ひと目の手筋 p.299

Go Diagram
Black to play
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . . . . . . . . . . . |
$$ . . . . . . . . X . . . |
$$ . . . . O . O O X . . . |
$$ . . , . . . O X X . . . |
$$ . . . . O O X . . X . . |
$$ . . O . O X X . O . . . |
$$ . . . . . O . . . . . . |
$$ ------------------------[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . . . . . . . . . . . |
$$ . . . . . . . . X . . . |
$$ . . . . O . O O X . . . |
$$ . . , . . . O X X . . . |
$$ . . . . O O X . . X . . |
$$ . . O . O X X . O . . . |
$$ . . . . . O . 1 . . . . |
$$ ------------------------[/go]
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Offline EricBackus
 Post subject: Re: hakuseki's problem collection
Post #6 Posted: Sat Apr 23, 2022 2:36 pm 
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hakuseki wrote:
Problem 3
Source: 初段になれる詰碁 p.219

Go Diagram
Black to move
Click Here To Show Diagram Code
[go]$$Bc Black to move
$$ | . . . . . . . . . .
$$ | . . O . . . . . . .
$$ | . O . O O O O . . .
$$ | . O X X X X . . . .
$$ | . X X O O X O O . .
$$ | . . . O X O . . O .
$$ | . . . . . . . . . .
$$ ----------------------[/go]


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

I guess these problems are a little above my level, but I don't understand why this :w2: isn't a refutation of the given solution:
Go Diagram
White still kills all?
Click Here To Show Diagram Code
[go]$$Bc White still kills all?
$$ | . . . . . . . . . .
$$ | . . O . . . . . . .
$$ | . O . O O O O . . .
$$ | . O X X X X . . . .
$$ | . X X O O X O O . .
$$ | . 3 2 O X O . . O .
$$ | . . . 1 4 . . . . .
$$ ----------------------[/go]


Edit: nevermind :)
Go Diagram
Black still has a ko
Click Here To Show Diagram Code
[go]$$Bc Black still has a ko
$$ | . . . . . . . . . .
$$ | . . O . . . . . . .
$$ | . O . O O O O . . .
$$ | . O X X X X . . . .
$$ | . X X O O X O O . .
$$ | . . 2 O X O . . O .
$$ | . . . 1 . 3 . . . .
$$ ----------------------[/go]

Ko seems to be a blindspot for me :(
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Offline hakuseki
 Post subject: Re: hakuseki's problem collection
Post #7 Posted: Sun Apr 24, 2022 5:54 am 
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Problem 6
Source: Game with KataGo

Go Diagram
Black to play
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . O . . . |
$$ . . . . . . X O O X |
$$ . . . . . . . X X . |
$$ , X . . . X X X O . |
$$ . . . . O . O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . 1 O . . . |
$$ . . . . . . X O O X |
$$ . . . . . . . X X . |
$$ , X . . . X X X O . |
$$ . . . . O . O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]
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Offline RobertJasiek
 Post subject: Re: hakuseki's problem collection
Post #8 Posted: Sun Apr 24, 2022 8:46 am 
Judan

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hakuseki wrote:
Problem 2
Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . O . . . . . . .
$$ | . . . . . . . . .
$$ | . O O O . . . . .
$$ | O X X X O O O O .
$$ | 3 . X O X X X O .
$$ | . 5 . O 1 4 2 . .
$$ --------------------[/go]


E.g., this is insufficient. One must also consider other variations, in particular,

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


and continuations from here as well as 4@5 - 4.
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Offline lightvector
 Post subject: Re: hakuseki's problem collection
Post #9 Posted: Sun Apr 24, 2022 10:14 am 
Lives in sente

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hakuseki wrote:
Problem 6
Source: Game with KataGo

Go Diagram
Black to play
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . O . . . |
$$ . . . . . . X O O X |
$$ . . . . . . . X X . |
$$ , X . . . X X X O . |
$$ . . . . O . O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . 1 O . . . |
$$ . . . . . . X O O X |
$$ . . . . . . . X X . |
$$ , X . . . X X X O . |
$$ . . . . O . O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Yep,

Because black has the marked stones in this shape, black's counter-atari is highly effective for dealing the cut, which is why black should have no fear of playing double hane.

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


White is deeply surrounded.

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


Or a bit more fancy for black, like this:

Go Diagram
Click Here To Show Diagram Code
[go]$$Wc
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . 2 . . . . |
$$ . . . . . X O . . . |
$$ . . . . X O . O O X |
$$ . . . . . . 1 X X . |
$$ , X . . . X X X O . |
$$ . . . . O . O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]




Black has no fear of the cutting point below because White's corner shape is not solid enough. If white cuts, black easily pushes through, severely damaging White's marked stone and making the cut at "a" for black work next.

Go Diagram
Click Here To Show Diagram Code
[go]$$Wc
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . . . O O . . . |
$$ . . . . O . X O . . |
$$ , . O O X . X O . . |
$$ . . . X X . . X X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ , . . . . . X . . . |
$$ . . . . . . . . . . |
$$ . . . . . X . . . . |
$$ . . . . . X O . . . |
$$ . . . . X O O O O X |
$$ . . . 3 1 X O X X . |
$$ , X . 4 2 X X X O . |
$$ . . . . W a O O O . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]
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Offline hakuseki
 Post subject: Problem 7
Post #10 Posted: Sun May 08, 2022 5:51 am 
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KGS: hakuseki
Problem 7
Source: Game with KataGo
Go Diagram
Black to respond after :w1:
Click Here To Show Diagram Code
[go]$$Wc Black to respond after :w1:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . 1 O . . . . . . . . . . |
$$ | . . . . O X . X O X X X . X O O X O . |
$$ | . . . O . O X X X O O . . X . X O O . |
$$ | . . . . . O . . O . . . . . . X X X . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . O X O . . . . . . . . . . . . . . |
$$ | . X . O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . O . . . |[/go]

Go Diagram
Capturing the marked stones without getting sealed in
Click Here To Show Diagram Code
[go]$$Bc Capturing the marked stones without getting sealed in
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . W W . . . . . . . . . . |
$$ | . . . . O X . X W X X X . X O O X O . |
$$ | . . . O . O X X X O O . . X . X O O . |
$$ | . . . . . O . . O 1 2 . . . . X X X . |
$$ | . . . . . . . 3 . . . . . . . . O . . |
$$ | . . O X O . . . . . . . . . . . . . . |
$$ | . X . O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . O . . . |[/go]
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Offline jlt
 Post subject: Re: hakuseki's problem collection
Post #11 Posted: Sun May 08, 2022 7:48 am 
Gosei
User avatar

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I got this one wrong too

Go Diagram
my thought
Click Here To Show Diagram Code
[go]$$Wc my thought
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . 1 O . . . . . . . . . . |
$$ | . . . . O X . X O X X X . X O O X O . |
$$ | . . . O . O X X X O O . . X . X O O . |
$$ | . . . . . O . 2 O 4 6 . . . . X X X . |
$$ | . . . . . . . 3 5 . . . . . . . O . . |
$$ | . . O X O . . . . . . . . . . . . . . |
$$ | . X . O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . O . . . |[/go]


This variation seems inferior because it gives White too much influence.
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Offline hakuseki
 Post subject: Problem 8
Post #12 Posted: Sun May 29, 2022 5:28 am 
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KGS: hakuseki
Problem 8
Source: Game with KataGo
Go Diagram
Black to defend
Click Here To Show Diagram Code
[go]$$Bc Black to defend
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . X . . . . . . X O O . O . . |
$$ | . . . . O X . X O X . X . X O O . O . |
$$ | . . O O . O X . X , . . . X . X O O . |
$$ | . X X O . O . O O . . . . . . X X X X |
$$ | . . X X O . . . . . O X . . . X O O X |
$$ | . X O X O . . . . . O X . . . X O X X |
$$ | . X . O . . . B . . O X . . . X O O X |
$$ | . X O . . O O B . . O O X . . O . O O |
$$ | . X X O . X a B . , . . X . . O . . . |
$$ | . . O X X O X c . . . O O . . O . . . |
$$ | . . . . . b . . . . . . . . X . . . . |
$$ | . . . X . . . . . . O . . . . . O . . |
$$ | . . . . X . . O . X . . . . . O X . . |
$$ | . . . . . O O . O X . . . X . . O . . |
$$ | . . . X X O . O X , . . X . . O . . . |
$$ | . X X X O O O X X X . X O X . O . . . |
$$ | . O X O . O . O X O X . . X O . . . . |
$$ | . . O . O . . O O . O . . . . . . . . |
$$ ---------------------------------------[/go]

White is threatening the sequence a-b-c, cutting off the three marked stones. How can black defend?
Go Diagram
Defending in sente
Click Here To Show Diagram Code
[go]$$Bc Defending in sente
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . X . . . . . . X O O . O . . |
$$ | . . . . O X . X O X . X . X O O . O . |
$$ | . . O O . O X . X , . . . X . X O O . |
$$ | . X X O . O . O O . . . . . . X X X X |
$$ | . . X X O . . . . . O X . . . X O O X |
$$ | . X O X O . . . . . O X . . . X O X X |
$$ | . X . O . . . X . . O X . . . X O O X |
$$ | . X O . 1 O O X . . O O X . . O . O O |
$$ | . X X O . X . X . , . . X . . O . . . |
$$ | . . O X X O X . . . . O O . . O . . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . X . . . . . . O . . . . . O . . |
$$ | . . . . X . . O . X . . . . . O X . . |
$$ | . . . . . O O . O X . . . X . . O . . |
$$ | . . . X X O . O X , . . X . . O . . . |
$$ | . X X X O O O X X X . X O X . O . . . |
$$ | . O X O . O . O X O X . . X O . . . . |
$$ | . . O . O . . O O . O . . . . . . . . |
$$ ---------------------------------------[/go]
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Offline hakuseki
 Post subject: Problem 9
Post #13 Posted: Wed Jun 15, 2022 1:34 am 
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Posts: 100
Liked others: 0
Was liked: 15
Rank: KGS 2 dan
KGS: hakuseki
Problem 9
Source: Game with KataGo
Go Diagram
Are these black stones all connected?
Click Here To Show Diagram Code
[go]$$Wc Are these black stones all connected?
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O . . |
$$ . O . . . . O X . . |
$$ . . . . B . . O . . |
$$ O . . B . . O . . . |
$$ . . O O B . . B . . |
$$ . . . . . B . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]

Go Diagram
White's tesuji
Click Here To Show Diagram Code
[go]$$Wc White's tesuji
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O . . |
$$ . O . . . . O X . . |
$$ . . . . X . . O . . |
$$ O . . X 2 1 O . . . |
$$ . . O O X 5 4 X . . |
$$ . . . . . X 3 . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]
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Offline hakuseki
 Post subject: Problem 10
Post #14 Posted: Wed Jun 15, 2022 5:07 am 
Dies with sente

Posts: 100
Liked others: 0
Was liked: 15
Rank: KGS 2 dan
KGS: hakuseki
Problem 10
Source: Game with KataGo

Visualization problem: Read as many sequences as you like. If the solution is among the sequences you considered, you pass the test.
Go Diagram
White to read 3 moves
Click Here To Show Diagram Code
[go]$$Bc White to read 3 moves
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . O . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . O . . . . O X X . |
$$ | . . . . . . . . . 1 . . . X . . O O . |
$$ | . . . X . . . . . O . X X . . O . . . |
$$ | . . . . . . . X . . O O O X . . X . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Go Diagram
Best sequence according to KataGo
Click Here To Show Diagram Code
[go]$$Wc Best sequence according to KataGo
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . O . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . O . . . . O X X . |
$$ | . . . . . . . . . X 1 . . X . . O O . |
$$ | . . . X . . . . 3 O 2 X X . . O . . . |
$$ | . . . . . . . X . . O O O X . . X . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

I'm experimenting with this problem format. The problem is considered "solved" if you thought of the right sequence, even if you don't uniquely single it out as the best sequence.
Why this format?
On the one hand, I don't think that, relying only upon my own intuition, I would be able to confidently state that :w1: is the best move.
On the other hand, I think if I had actually visualized the sequence :w1: :b2: :w3:, I would have gone ahead and played :w1:.
Therefore most of the benefit can be had by just ensuring that I actually read the sequence :w1: :b2: :w3: (in the game I stopped reading at :w1: :b2:).
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Offline hakuseki
 Post subject: Problem 11
Post #15 Posted: Mon Aug 01, 2022 6:16 am 
Dies with sente

Posts: 100
Liked others: 0
Was liked: 15
Rank: KGS 2 dan
KGS: hakuseki
Problem 11
Source: Game with KataGo
Go Diagram
Black to play local endgame
Click Here To Show Diagram Code
[go]$$Bc Black to play local endgame
$$ . X . . . . . . . |
$$ O X X . . . X X . |
$$ O O X . . X X O . |
$$ . O O X X . X O . |
$$ . . . O O X O X X |
$$ . . . O X X O O . |
$$ . . . . O O . . . |
$$ ------------------[/go]

Go Diagram
Solution
Click Here To Show Diagram Code
[go]$$Bc Solution
$$ . X . . . . . . . |
$$ O X X . . . X X . |
$$ O O X . . X X O . |
$$ . O O X X . X O . |
$$ . . . O O X O X X |
$$ . . . O X X O O 1 |
$$ . . . . O O . . . |
$$ ------------------[/go]
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