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 Post subject: Collection of moves one should not play anymore:
Post #1 Posted: Thu Mar 01, 2018 4:05 pm 
Gosei

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Problem 1
White to play:

Click Here To Show Diagram Code
[go]$$W
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . X . b . X c . . . . |
$$ . , . . . . . O . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . a . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |[/go]


Solution:
a and b are good options, never play c


Hint:
Today a friend told me one of the three shown options is sheepdung. I considered the move to be situational up until now and I am glad I shared this opinion with 7D and 9D professionals ;-). After further study I now think the bad move is clearly inferior in every case.

Rui Nawei 9D (W) versus Zhang Xuan 7D (B) should have played at a or b
(Rui nevertheless won the game, allthough she played the "sheep" move ;-) )
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . O X O . . O . X . b . X W . . . . |
$$ | . . X O X . . O . , . . . . . O . . . |
$$ | . X . O X . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . a . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . O X . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . X . O . . . . . , . . . . . , . . . |
$$ | . . . . . O . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


And here the bad move played by Hisai Keishi 7D (B) against Kitani Minoru 9D (W) :o
(Not really! If you look up the game he only allowed the position after a different move sequence ;-). Hisai still had sente and played b next :lol:)
Hisai lost this game by the way.
Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . a . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . X . . . . . , . . . . X , O . . |
$$ | . . . . B O . b . O . . X . X O . . . |
$$ | . . . . . . . . . . . . . X O O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Last edited by Gomoto on Wed Mar 07, 2018 1:23 pm, edited 3 times in total.
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 Post subject: Re: Collection of moves one should not play anymore:
Post #2 Posted: Thu Mar 01, 2018 8:18 pm 
Lives in sente

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I love the title of this post. :lol:


This post by jeromie was liked by 2 people: Gomoto, macelee
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 Post subject: Re: Collection of moves one should not play anymore:
Post #3 Posted: Fri Mar 02, 2018 11:21 am 
Lives in gote
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Posts: 507
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OGS: paK0, paK0666
Universal go server handle: paK0
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . X . . . |
$$ | . . O X O . . O . X . . . X . . a . . |
$$ | . . X O X . . O . , . b . . . O . . . |
$$ | . X . O X . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . O X . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . X . O . . . . . , . . . . . , . . . |
$$ | . . . . . O . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Why is this not worse for white?

If white plays a black gets great shape with b and if white jumps in black settles his stones on one side and either gets sente or can connect his remaining stone later on.

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 Post subject: Re: Collection of moves one should not play anymore:
Post #4 Posted: Fri Mar 02, 2018 2:24 pm 
Gosei

Posts: 1733
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@paKO

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . B . . . |
$$ | . . O X O . . O . X . . . X . . . . . |
$$ | . . X O X . . O . , . . . . . O . . . |
$$ | . X . O X . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O 1 . . |
$$ | . . X . . . . . . . . . . . . O X . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . X . O . . . . . , . . . . . , . . . |
$$ | . . . . . O . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by Gomoto was liked by 2 people: Bill Spight, paK0
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