Sanrensei question

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wineandgolover
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Re: Sanrensei question

Post by wineandgolover »

DrStraw wrote:
daal wrote:
John Fairbairn wrote:There is not a single example of this in pro database games, even late in the game.

I found one (move 130):


Hardly qualifies as a sanrensei at that point.

Well, John did claim "even late in the game."

What a crazy game, how does that end as black +1? Amazing. Thanks, daaldude.
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Re: Sanrensei question

Post by Bill Spight »

DrStraw wrote:
Aidoneus wrote:
Bill Spight wrote:Each step by White adds only 2 points of territory in the limit, while each step by Black (this early in the game) adds more than 3 points worth of influence. (Dr. Straw and I are in close agreement about that.)


This seems quite reasonable and a useful general observation. Does there exist a thread where you and DrStraw have discussed this?


Thank you for the correct appellation. Bill seems to want to refer to me as Dr. Straw, not DrStraw.


Sorry, DrStraw. :( Spelling corrected in quoted post. :)

As for your question, I don't recall a specific thread, more just comments scattered throughout the forum.
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Re: Sanrensei question

Post by Loons »

I'm a bit bemused by our apparent desire to call :w6: ... Strange Midgame Attachment a reasonable move.

Edit: I realise lots of people were expressing this tacitly, but I think we should be explicit here. :w6: was not good.
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Re: Sanrensei question

Post by oca »

Bill Spight wrote:...
Click Here To Show Diagram Code
[go]$$W
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$$ ---------------------------------------[/go]


:w3: looks like the right play for White. Then :b4: is simple and strong. Now if :w5: connects at 9, Black has a good play at 5. After :w5: and :b6:, it is not clear where White should play. If White plays as in the diagram, he is a bit overconcentrated.


Just to be sure... if :b6: what should white reply ?
I would say "a".. or is there an escape or good move with the help of :w1: ?

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
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$$ | . . . . . . . . . . . . . . . 3 6 . . |
$$ | . . . , . . . . . , . . . . . X 1 . . |
$$ | . . . . . . . . . . . . . . . 4 2 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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Re: Sanrensei question

Post by Bill Spight »

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


This is my thinking. :)
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Post by EdLee »

Hi Bill,
Bill Spight wrote:
Click Here To Show Diagram Code
[go]$$W
$$ -----------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 6 . . 8 . . |
$$ | . . . O . . . . . , . . . . . X . 7 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 5 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . a 3 9 . . |
$$ | . . . , . . . . . , . . . . . X 1 . . |
$$ | . . . . . . . . . . . . . . . 4 2 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Then :b4: is simple and strong.
Hi Bill, how do you feel about this :b4: extend instead of connect ?
(Because the solid connect :b4: allows the big point :white: (a) in the above diagram.)
Click Here To Show Diagram Code
[go]$$W
$$ -----------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 3 . . . |
$$ | . . . , . . . . . , . . . . 4 X 1 . . |
$$ | . . . . . . . . . . . . . . . . 2 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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Re: Sanrensei question

Post by oca »

Thx Bill !

While we are with the sanrensei, what about just that simple :w1: (Igowin plays that from time to time),
Is a reply at "a" or "b" correct ?

Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . b . X . . . |
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$$ | . . . . . . . . . . . . . . . 1 . . . |
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$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
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Post by EdLee »

Hi oca, :b2: at (a) is a standard beginner mistake. (I just saw this kind of move discussed in a review on KGS last night! )

:b2: at (b) is a much better reply.
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Re:

Post by oca »

EdLee wrote:Hi oca, :b2: at (a) is a standard beginner mistake. (I just saw this kind of move discussed in a review on KGS last night! )

:b2: at (b) is a much better reply.


Thx EdLee, that's good to know !
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Re:

Post by tj86430 »

EdLee wrote:Hi oca, :b2: at (a) is a standard beginner mistake. (I just saw this kind of move discussed in a review on KGS last night! )

:b2: at (b) is a much better reply.

how about one point above a?
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Post by EdLee »

tj86430 wrote:how about one point above a?
Hi TJ, good question. That kosumi (diagonal move for Black) is also a better move than :black: (a).

How to decide between the kosumi and (b) depends on the whole board situation (as usual :) ).
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Re:

Post by tj86430 »

EdLee wrote:
tj86430 wrote:how about one point above a?
Hi TJ, good question. That kosumi (diagonal move for Black) is also a better move than :black: (a).

How to decide between the kosumi and (b) depends on the whole board situation (as usual :) ).

There was a whole board in oca's post. What would you choose in that situation?
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Post by EdLee »

Hi TJ, I'm not sure, but probably (b);
but the kosumi is probably OK, too, especially
around these levels, IMO. In other words,
mistakes made later will have a far greater impact
on the game than the choice between these two moves.
This is not to say it's useless to study these two moves;
but that the game is not decided here (for certain levels),
and that there are much bigger problems and more urgent mistakes to fix for these levels, IMO.
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Re: Re:

Post by Bill Spight »

tj86430 wrote:
EdLee wrote:Hi oca, :b2: at (a) is a standard beginner mistake. (I just saw this kind of move discussed in a review on KGS last night! )

:b2: at (b) is a much better reply.

how about one point above a?


Apparently you meant the kosumi. But in case you meant the attachment, . . . ;)

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Re: Re:

Post by tj86430 »

Bill Spight wrote:Apparently you meant the kosumi. But in case you meant the attachment, . . . ;)

Indeed I did. But what you presented was very interesting, and I thank you for that.
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