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Offline logan
 Post subject: Five Sacrifice Problems for Kyus
Post #1 Posted: Sat Mar 02, 2013 5:33 pm 
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Below are five sacrifice problems good for kyu players.

Click Here To Show Diagram Code
[go]$$Bm1 1. Black to kill White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X X X X . . . .
$$ | . . X O O O O X . . .
$$ | . . X O . X O . X . .
$$ | . . X O . X O . . . .
$$ | . . X O O X O X X , .
$$ | . . . X X O X O X . .
$$ | . . . X O O . O X . .
$$ | . . . X X . . . X . .
$$ ----------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm1 2. Black to save his group
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O . . O O . . .
$$ | . . . . O . O X O O .
$$ | . . O O X X X X . , X
$$ | . O X X X . . O O O X
$$ | . O O . . X O . X O X
$$ | . . . . . . . . . X X
$$ ----------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm1 3. Black to kill White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . O O . . . . . . . .
$$ | O X O . . . . . . . .
$$ | . X O . O . . . . . .
$$ | . X . . . O . . . . .
$$ | . . X X X O . O . . .
$$ | X X O X O X X . . , .
$$ | X O O . O . X . O O O
$$ | O X O O . O X . X X O
$$ | . X O . X O O X . . .
$$ ----------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm1 4. Black to save his group
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . O . . . . O O . . . . . . . . |
$$ | . . . . . . O O O X O . . . . . . . . |
$$ | . . X . O . O X X X O . . . . . . . . |
$$ | . X . , . . . X . X X O O . . , . . . |
$$ | . X O O O O O . . . X X . O . . . . . |
$$ | . . X X X O X . O O X . X O . . . . . |
$$ | . . . X . X . . . . . . . . . . . . . |
$$ -----------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm1 5. What's the best way for Black to sacrifice with :bt:?
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X . X X . . . . . . . . . . . . . |
$$ | . . . X O . O . . , . . . X . X . O . |
$$ | . X X O O . Y O . X . . . . . . X . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -----------------------------------------[/go]


How might this shape emerge?
Suppose Black extends to :b1:, then White jumps safely to :w2:. Black proceeds to play the checking extension :b3: and White ignores. Black follows up by hitting a shape point with :b5: and White hanes above thinking "Coming above to not become sealed in is most important."
Click Here To Show Diagram Code
[go]$$Bm1 5. Black to save his group
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X . X 1 . . . . . . . . . . . . . |
$$ | . . . X O . 6 . . , . . . X . X . O . |
$$ | . X X O O . 5 2 . 3 . . . . . . X . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -----------------------------------------[/go]

This post by logan was liked by 3 people: daal, SoDesuNe, Splatted
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Offline SoDesuNe
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #2 Posted: Sun Mar 03, 2013 5:03 pm 
Gosei
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Thank you for the nice problems! Here are my attempts : )

Click Here To Show Diagram Code
[go]$$Bc 1. Black to kill White - :b5: at :b1: , :w6: at marked
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X X X X . . . .
$$ | . . X O O O O X . . .
$$ | . . X O . X O . X . .
$$ | . . X O 4 X O . . . .
$$ | . . X O O X O X X , .
$$ | . . . X X O B O X . .
$$ | . . . X O O 1 O X . .
$$ | . . . X X 7 2 3 X . .
$$ ----------------------[/go]


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


Click Here To Show Diagram Code
[go]$$Bc 3. Black to kill White - :b3: at :b1: , :w4: at marked
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . O O . . . . . . . .
$$ | O X O . . . . . . . .
$$ | . X O . O . . . . . .
$$ | . X . . . O . . . . .
$$ | . . X X X O . O . . .
$$ | X X O X O X X . . , .
$$ | X O O 7 O 5 X . O O O
$$ | O X O O 1 O X . X X O
$$ | 6 X O 2 B O O X . . .
$$ ----------------------[/go]


Click Here To Show Diagram Code
[go]$$Bc 4. Black to save his group - if :w4: at :b7: , Black lives with :w4:
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . O . . . . O O . . . . . . . . |
$$ | . . . . . . O O O X O . . . . . . . . |
$$ | . . X . O . O X X X O . . . . . . . . |
$$ | . X . , . . . X . X X O O . . , . . . |
$$ | . X O O O O O 1 3 . X X . O . . . . . |
$$ | . . X X X O X 2 O O X . X O . . . . . |
$$ | . . . X . X 7 . . . 5 4 6 . . . . . . |
$$ -----------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bc 5. What's the best way for Black to sacrifice with :bt:?
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X . X X . . . . . . . . . . . . . |
$$ | . . . X O 5 O 7 9 , . . . X . X . O . |
$$ | . X X O O 3 Y O 8 X . . . . . . X . . |
$$ | . . O . . 4 2 1 6 0 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -----------------------------------------[/go]

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Offline logan
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #3 Posted: Sun Mar 03, 2013 5:35 pm 
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Hey, you got the first three correct : )

As for the fourth and fifth,

Click Here To Show Diagram Code
[go]$$Wcm8 4. Uh-oh.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . O . . . . O O . . . . . . . . |
$$ | . . . . . . O O O X O . . . . . . . . |
$$ | . . X . O . O X X X O . . . . . . . . |
$$ | . X . , . . . X . X X O O . . , . . . |
$$ | . X O O O O O X X . X X . O . . . . . |
$$ | . . X X X O X O O O X . X O . . . . . |
$$ | . . . X . X X 1 . . X O O . . . . . . |
$$ -----------------------------------------[/go]

That's a nice sequence for number five, but Black can do a little bit better.

Perhaps this proverb will aid in your journey:
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Offline SoDesuNe
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #4 Posted: Mon Mar 04, 2013 4:08 am 
Gosei
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logan wrote:
As for the fourth [...]

Click Here To Show Diagram Code
[go]$$Wcm8 4. Uh-oh.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . O . . . . O O . . . . . . . . |
$$ | . . . . . . O O O X O . . . . . . . . |
$$ | . . X . O . O X X X O . . . . . . . . |
$$ | . X . , . . . X . X X O O . . , . . . |
$$ | . X O O O O O X X . X X . O . . . . . |
$$ | . . X X X O X O O O X . X O . . . . . |
$$ | . . . X . X X 1 . . X O O . . . . . . |
$$ -----------------------------------------[/go]


Uh, well that is embarrassing =D

Let me try this:
Click Here To Show Diagram Code
[go]$$Bc 4. Black to save his group - :b11: at 'a'
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . O . . . . O O . . . . . . . . |
$$ | . . . . . . O O O X O . . . . . . . . |
$$ | . . X . O . O X X X O . . . . . . . . |
$$ | . X . , . . . X . X X O O . . , . . . |
$$ | . X O O O O O 2 5 a X X 9 O . . . . . |
$$ | . . X X X O X 1 O O X . X O . . . . . |
$$ | . . . X . X 0 8 3 4 6 7 . . . . . . . |
$$ -----------------------------------------[/go]


Still not sure about the fifth : /

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Offline logan
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #5 Posted: Tue Mar 05, 2013 8:16 pm 
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#4 is correct, good job.

Here's the solution for number five:

Following the proverb "Add a second stone and sacrifice both," Black extends down first, then cuts with :b3:. It's a good technique to remember for maximizing the efficiency of your sacrifices.

Click Here To Show Diagram Code
[go]$$Bm1 5. Solution
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X . X X 5 . . . . . . . . . . . . |
$$ | . . . X O 6 O 3 . , . . . X . X . O . |
$$ | . X X O O 4 Y O 7 X . . . . . . X . . |
$$ | . . O . . 8 1 2 9 . . . . . . . . . . |
$$ | . . . . . . 0 . . . . . . . . . . . . |
$$ -----------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm11 5. Cont. 1
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X . X X X . 1 . . . . . . . . . . |
$$ | . . . X O O O X . , . . . X . X . O . |
$$ | . X X O O O . O X X . . . . . . X . . |
$$ | . . O . . O . O X . . . . . . . . . . |
$$ | . . . . . . O . . . . . . . . . . . . |
$$ -----------------------------------------[/go]
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Offline Splatted
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #6 Posted: Wed Mar 06, 2013 5:58 am 
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My attempt at 1

Click Here To Show Diagram Code
[go]$$Bm1 1. Black to kill White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X X X X . . . .
$$ | . . X O O O O X . . .
$$ | . . X O . X O . X . .
$$ | . . X O 4 X O . . . .
$$ | . . X O O X O X X , .
$$ | . . . X X O X O X . .
$$ | . . . X O O 1 O X . .
$$ | . . . X X 3 2 5 X . .
$$ ----------------------[/go]


Click Here To Show Diagram Code
[go]$$Bm1 1. Black to kill White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X X X X . . . .
$$ | . . X O O O O X . . .
$$ | . . X O . X O . X . .
$$ | . . X O . X O . . . .
$$ | . . X O O X O X X , .
$$ | . . . X X O 5 O X . .
$$ | . . . X O O 1 O X . .
$$ | . . . X X 3 2 4 X . .
$$ ----------------------[/go]


(originally a black stone at 5

Click Here To Show Diagram Code
[go]$$Bm1 1. Black to kill White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X X X X . . . .
$$ | . . X O O O O X . . .
$$ | . . X O . X O . X . .
$$ | . . X O . X O . . . .
$$ | . . X O O X O X X , .
$$ | . . . X X O 4 O X . .
$$ | . . . X O O 1 O X . .
$$ | . . . X X 3 2 5 X . .
$$ ----------------------[/go]


(originally a black stone at 4)


Edit: So I chose a different reply to :w4: in SoDesune's correct answer, but I figured they both work and so chose the one that was easiest to show in the diagram. Right or wrong?
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Offline logan
 Post subject: Re: Five Sacrifice Problems for Kyus
Post #7 Posted: Wed Mar 06, 2013 7:34 am 
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Yes, that's also right Splatted. Good job :)
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