Golden Opportunities - mistake?

emeraldemon · Post by **emeraldemon** » Fri Nov 12, 2010 8:27 am

So here's the problem on pg 59, black to play:

Click Here To Show Diagram Code: [go]$$B Position 17 $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X . , X X X . . , . . . . . , . . . | $$ | . . X X O O O X X X . . . . . . . . . | $$ | . X O O . . . O O X . . . . . . . . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ ---------------------------------------[/go]

After a few failure diagrams, it shows this success:

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

But then it has this diagram:

Click Here To Show Diagram Code: [go]$$B Diagram 6 $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X . , X X X . . , . . . . . , . . . | $$ | . . X X O O O X X X . . . . . . . . . | $$ | . X O O . 2 . O O X . . . . . . . . . | $$ | . 5 3 a 4 b 1 . O . . . . . . . . . . | $$ ---------------------------------------[/go]

"From the result of Diagram 1 it can be appreciated that black 1 is a vital point. After the sequence white 2 to black 5, A and B are equivalent options and white is dead."

It doesn't seem like this move works to me:

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

The other move (diagram 5) seems like the right answer. Is this a mistake in the book or am I missing something? Does starting at either point work?

Stable · Post by **Stable** » Fri Nov 12, 2010 8:34 am

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

Black just connects, as above, the rest is inevitable.

emeraldemon · Post by **emeraldemon** » Fri Nov 12, 2010 8:37 am

You're right, I should have noticed that. So I guess both moves work?

Stable · Post by **Stable** » Fri Nov 12, 2010 8:42 am

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

I'm not sure, what about this seki? (2 at 7) Suggests the best b can do here is 7 at 8 and then fight the ko.

Li Kao · Post by **Li Kao** » Fri Nov 12, 2010 8:55 am

Stable wrote:
$$B Killed
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . , X X X . . , . . . . . , . . . |
$$ | . . X X O O O X X X . . . . . . . . . |
$$ | . X O O 4 3 6 O O X . . . . . . . . . |
$$ | . . 8 . 5 7 1 . O . . . . . . . . . . |
$$ ---------------------------------------

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

I'm not sure, what about this seki? (2 at 7) Suggests the best b can do here is 7 at 8 and then fight the ko.

~~Your 5 looks wrong to me.~~
Oh I missed there was a 2 at your 7.

Bill Spight · Post by **Bill Spight** » Fri Nov 12, 2010 8:59 am

Never mind.

I misinterpreted some English. :mrgreen:

Bill Spight · Post by **Bill Spight** » Fri Nov 12, 2010 9:01 am

Click Here To Show Diagram Code: [go]$$B Death in the hane $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X . , X X X . . , . . . . . , . . . | $$ | . . X X O O O X X X . . . . . . . . . | $$ | . X O O 7 4 3 O O X . . . . . . . . . | $$ | . . 5 6 . 2 1 . O . . . . . . . . . . | $$ ---------------------------------------[/go]

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

Stable · Post by **Stable** » Mon Nov 15, 2010 5:07 am

Thanks Bill!

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Re: Golden Opportunities - mistake?