Trick play - best answer, advice needed :)

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lobotommy
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Trick play - best answer, advice needed :)

Post by lobotommy »

Please take a look at sgf and please share your thoughts about it.
I have a little problem with a joseki below. There is some trick variant which is quite hard for me to evaluate and to come up with a good solution.

[edit]
I corrected some coordinates mentioned in eidogo diagram.
Changed a subject line a little

Last edited by lobotommy on Tue Mar 05, 2013 11:09 pm, edited 8 times in total.
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Re: Trick play - best answer

Post by Alguien »

Shouldn't w p15 be at p17?
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Re: Trick play - best answer

Post by lobotommy »

If p17 then he would be tricked (black move #9 is a first trick move) and black's corner is bigger than in a correct (joseki) way of playing.
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Re: Trick play - best answer, advice needed :)

Post by macelee »

I wonder where you first learned that W P15 is the correct answer. I do not agree with that. The following is normally considered a joseki.
Click Here To Show Diagram Code
[go]$$c Joseki
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . . . 8 7 3 9 . |
$$ . 0 . . . 6 1 O 4 . |
$$ . . . . . O 2 X 5 . |
$$ . . . . . . . . . . |
$$ . . . . . . . X . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
Now only the position of :b5: changes. In my opinion the position is worse for black because of the aji. For example, if white gets 'a', there is a big yose 'b' left, which is not the case in the first diagram. Also white has at least 5 big ko threats in the corner which is not good for black.
Click Here To Show Diagram Code
[go]$$c This is worse for black
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . . . 8 7 3 9 . |
$$ . 0 . . . 6 1 O 4 . |
$$ . . . . . O 2 X . . |
$$ . . . . . . 5 . b . |
$$ . . . . . . . X . . |
$$ . . . . . . . . . . |
$$ . . . . . . . a . . |
$$ . . . . . . . . . . |[/go]
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Re: Trick play - best answer, advice needed :)

Post by lobotommy »

macelee wrote:I wonder where you first learned that W P15 is the correct answer. I do not agree with that. The following is normally considered a joseki.
Click Here To Show Diagram Code
[go]$$c Joseki
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . . . 8 7 3 9 . |
$$ . 0 . . . 6 1 O 4 . |
$$ . . . . . O 2 X 5 . |
$$ . . . . . . . . . . |
$$ . . . . . . . X . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
Now only the position of :b5: changes. In my opinion the position is worse for black because of the aji. For example, if white gets 'a', there is a big yose 'b' left, which is not the case in the first diagram. Also white has at least 5 big ko threats in the corner which is not good for black.

I know it from Alexander Dinerchtein's article about trickplays. And yes, you are right about ko threats and weakness left behind but these are very subtle things, too subtle as for my taste.
Click Here To Show Diagram Code
[go]$$c a sugested trick continuation by AD
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . . . . 5 X 3 . |
$$ . . . . . 4 X O O . |
$$ . . . . . O O X . . |
$$ . . . . . 2 1 . . . |
$$ . . . . . . . X . . |
$$ . . . . . . 6 7 . . |
$$ . . . . . . 8 . . . |
$$ . . . . . . . . . . |[/go]
trick continuation looks good for white if... black choose to play :b3: . But if he plays at 4 then it turns to be rather difficult. As I mentioned in eidogo diagram, I managed to get a good result and win a game but I'm still thinking how to play harder in this kind of position.

[My "solution" :oops: with a stupid missread... A ladder... thx macelee]
I think I found a way to punish black.
Click Here To Show Diagram Code
[go]$$c So, how about this
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . . 5 . 7 X 6 . |
$$ . . . . 4 3 X O O . |
$$ . . . . . O O X . . |
$$ . . . . . 2 1 9 . . |
$$ . . . . . . 8 X . . |
$$ . . . . . . . 0 . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
Whatever black will try to do next he will get a bad position, but it's highly probably I overlooked something...
What do you think?
Last edited by lobotommy on Wed Jan 30, 2013 6:52 am, edited 2 times in total.
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Re: Trick play - best answer, advice needed :)

Post by macelee »

As you suggested the situation is quite tricky. We need stronger players to explain this for us.

But what you proposed in the diagram clearly doesn't work because black can P14 and then O15 to kill the 3 stones in ladder.
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Re: Trick play - best answer, advice needed :)

Post by macelee »

May I suggest the following:
Click Here To Show Diagram Code
[go]$$c So, how about this
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . 6 5 7 . X 9 . |
$$ . . . . 4 3 X O O . |
$$ . . . 8 . O O X . . |
$$ . . . . . 2 1 . . . |
$$ . . . . . . . X . . |
$$ . . . . . . 0 . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
I think strong players should prefer the play outside at early stage of games.


A variation - black still needs to go back to the corner. This of course assume the ladder is favourable for white (white chose to play this whole thing so that is not a problem).
Click Here To Show Diagram Code
[go]$$c Variation
$$---------------------+
$$ . . . . . . . . . . |
$$ . . . 6 5 9 . X . . |
$$ . . 0 7 4 3 X O O . |
$$ . . . . 8 O O X . . |
$$ . . . . . 2 1 . . . |
$$ . . . . . . . X . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
:b9: has no choice, because:
Click Here To Show Diagram Code
[go]$$c need one move in the corner
$$---------------------+
$$ . . . . . . 6 . 5 . |
$$ . . . O X X . X 4 . |
$$ . . . . O X X O O . |
$$ . . . O . O O X 2 . |
$$ . . . . . O X 3 . . |
$$ . . . . . 1 . X . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |[/go]
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Re: Trick play - best answer, advice needed :)

Post by Alguien »

On eidogo, the reply to the trick seems to be Q18.
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Re: Trick play - best answer, advice needed :)

Post by lobotommy »

macelee wrote:As you suggested the situation is quite tricky. We need stronger players to explain this for us.

But what you proposed in the diagram clearly doesn't work because black can P14 and then O15 to kill the 3 stones in ladder.

:oops: how this could happen :)

Thank you for your solution, looks very nice.

@Alguien - thanks for information about Q18, but the outcome is not the best for white in my opinion. Next M16 for black will be sente (I'm reffering to kogo's joseki solution) and black will have a nice follow up on right side still threating a white central stones. It's not clear if white will have a chance to attack.
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Re: Trick play - best answer, advice needed :)

Post by SoDesuNe »

I knew we already had a thread about this, so now I found it and I think this post (http://lifein19x19.com/forum/viewtopic. ... 417#p65417) is quite helpful to answer your question.
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