Life In 19x19 :: hakuseki's problem collection

Problem 6
Source: Game with KataGo

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]

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.

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.

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:

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.

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]

Author:	hakuseki [ Fri Apr 22, 2022 9:09 am ]
Post subject:	hakuseki's problem collection
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 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 . . \| $$ \| . . . . . . . . . . . . . . . . . . . \|[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . . . . X O X . 1 . . . . . . . . . \| $$ \| . . . . O X X O X X X O . O . . . . . \| $$ \| . . . O . X . O O O O . . . . X . . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . . O . . . . . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \|[/go]`

Author:	hakuseki [ Fri Apr 22, 2022 9:19 am ]
Post subject:	Re: hakuseki's problem collection
Problem 2 Source: 初段になれる詰碁　p.211 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 . . . . . $$ --------------------[/go]` Click Here To Show Diagram Code `[go]$$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]`

Author:	hakuseki [ Fri Apr 22, 2022 3:53 pm ]
Post subject:	Re: hakuseki's problem collection
Problem 3 Source: 初段になれる詰碁 p.219 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 . . $$ \| . . . O X O . . O . $$ \| . . . . . . . . . . $$ ----------------------[/go]` Click Here To Show Diagram Code `[go]$$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]`

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

Author:	hakuseki [ Sat Apr 23, 2022 6:35 am ]
Post subject:	Re: hakuseki's problem collection
Problem 5 Source: ひと目の手筋 p.299 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 . . . . . . \| $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$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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hakuseki's problem collection http://www.lifein19x19.com/viewtopic.php?f=48&t=18706	Page 1 of 1

Author:	EricBackus [ Sat Apr 23, 2022 2:36 pm ]
Post subject:	Re: hakuseki's problem collection
hakuseki wrote: Problem 3 Source: 初段になれる詰碁 p.219 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 . . $$ \| . . . O X O . . O . $$ \| . . . . . . . . . . $$ ----------------------[/go]` Click Here To Show Diagram Code `[go]$$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 isn't a refutation of the given solution: 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 . . . . . $$ ----------------------[/go]` Edit: nevermind Click Here To Show Diagram Code `[go]$$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

Author:	hakuseki [ Sun Apr 24, 2022 5:54 am ]
Post subject:	Re: hakuseki's problem collection
Problem 6 Source: Game with KataGo 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] 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]

Author:	RobertJasiek [ Sun Apr 24, 2022 8:46 am ]
Post subject:	Re: hakuseki's problem collection
hakuseki wrote: Problem 2 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 . . $$ --------------------[/go]` E.g., this is insufficient. One must also consider other variations, in particular, Click Here To Show Diagram Code `[go]$$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.

Author:	lightvector [ Sun Apr 24, 2022 10:14 am ]
Post subject:	Re: hakuseki's problem collection
hakuseki wrote: Problem 6 Source: Game with KataGo 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] 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. 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. 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: 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. 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]

Author:	hakuseki [ Sun May 08, 2022 5:51 am ]
Post subject:	Problem 7
Problem 7 Source: Game with KataGo Click Here To Show Diagram Code [go]$$Wc Black to respond after $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . . . . 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] 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]

Author:	jlt [ Sun May 08, 2022 7:48 am ]
Post subject:	Re: hakuseki's problem collection
I got this one wrong too 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.

Author:	hakuseki [ Sun May 29, 2022 5:28 am ]
Post subject:	Problem 8
Problem 8 Source: Game with KataGo 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? 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]

Author:	hakuseki [ Wed Jun 15, 2022 1:34 am ]
Post subject:	Problem 9
Problem 9 Source: Game with KataGo 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]` 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]`

Author:	hakuseki [ Wed Jun 15, 2022 5:07 am ]
Post subject:	Problem 10
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. 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] 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 is the best move. On the other hand, I think if I had actually visualized the sequence , I would have gone ahead and played . Therefore most of the benefit can be had by just ensuring that I actually read the sequence (in the game I stopped reading at ).

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Author:	hakuseki [ Mon Aug 01, 2022 6:16 am ]
Post subject:	Problem 11
Problem 11 Source: Game with KataGo 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 . . . \| $$ ------------------[/go]` Click Here To Show Diagram Code `[go]$$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]`