"Find the defect" problems

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CDavis7M
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"Find the defect" problems

Post by CDavis7M »

I just discovered a set of "find the defect" problems in the latest issue of Go World and I liked them a lot. Does anyone know of any more problems in this style?

Here are samples. In each diagram, White has 2 defects that Black can expose.
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . . . X X . |
$$ | . . . O . O O X . |
$$ | . O O X . O X . . |
$$ | . O X . O O X . . |
$$ | . O X X X X . X . |
$$ | . X X . . X X . . |
$$ | . O O X X O O X . |
$$ | . O X O O X O O X |
$$ | . . . . . . . . . |
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . 4 3 X X . |
$$ | . . . O 1 O O X . |
$$ | . O O X 2 O X . . |
$$ | . O X 5 O O X . . |
$$ | . O X X X X . X . |
$$ | . X X . . X X . . |
$$ | . O O X X O O X . |
$$ | . O X O O X O O X |
$$ | . . 2 . a 1 . 3 . |
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . . . . O . |
$$ | . O O O X . O X . |
$$ | . O X X O O O X . |
$$ | . . . . X X X . . |
$$ | . O . X O O . X . |
$$ | . . . O . O O X . |
$$ | . O . . O O X . . |
$$ | . O X X X X . X . |
$$ | . . O . . . . . . |
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . a 1 2 O . |
$$ | . O O O X . O X 3 |
$$ | . O X X O O O X . |
$$ | . . . 3 X X X . . |
$$ | . O 2 X O O 7 X . |
$$ | . 6 1 O . O O X . |
$$ | . O 4 5 O O X . . |
$$ | . O X X X X . X . |
$$ | . . O . . . . . . |
$$ ------------------[/go]
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Re: "Find the defect" problems

Post by jlt »

These are usually called "tesuji problems".
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Re: "Find the defect" problems

Post by gennan »

Marcel Grünauer wrote:In the Yunguseng Dojang, there are several "Trouble Master" lectures that deal with exactly these kinds of situations on 19x19 boards. During the EGC 2019 in Brussels, In-seong also showed them.

Yes, they are tesuji problems but it's a subcategory of whole-board situations where you are expected to find several local moves to exploit weaknesses.
I'd say that many of those Trouble Master lectures are not really tesuji problems. Especially the easier ones are mostly about spotting aji in real game positions (training what InSeong calls "tactical intuition"). The reading required to confirm that something works is usually not that hard and more about move order than tesuji.
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Re: "Find the defect" problems

Post by CDavis7M »

jlt wrote:These are usually called "tesuji problems".
Can you share where you found these? Every diagram labeled "tesuji problem" that I've seen does not involve "finding" any defect -- the presence of defect is simply a given. Of course, you need to find the first move and the sequence. And typically a "tesuji problem" involves an isolated corner board position while these defect finding problems necessarily involve a larger board position.

----------
Marcel Grünauer wrote:In the Yunguseng Dojang, there are several "Trouble Master" lectures that deal with exactly these kinds of situations on 19x19 boards. During the EGC 2019 in Brussels, In-seong also showed them.

Yes, they are tesuji problems but it's a subcategory of whole-board situations where you are expected to find several local moves to exploit weaknesses.
Thanks for the tip. I am not already a member but if I cannot find a book with similar problems I may sign up.
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Re: "Find the defect" problems

Post by jlt »

What I meant is that these are two tesuji problems combined on the same board, I am pretty sure these problems can be found separately in other sources, and it's not really difficult to spot where to search for weaknesses.

On the other hand, the task of finding the weaknesses in In-Seong's problems is harder. Here is a sample from the "Revue Française de Go" no. 150, June 2020, kyu level.
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Re: "Find the defect" problems

Post by CDavis7M »

jlt wrote:What I meant is that these are two tesuji problems combined on the same board, I am pretty sure these problems can be found separately in other sources, and it's not really difficult to spot where to search for weaknesses.

On the other hand, the task of finding the weaknesses in In-Seong's problems is harder. Here is a sample from the "Revue Française de Go" no. 150, June 2020, kyu level.
I understand how the problem works but I like the format compared to typical tesuji problems. Thanks for sharing one of In-Seong's problem. It is what I'm looking for.

Thanks everyone.
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