Collection of moves one should not play anymore:

Gomoto · #1

Problem 1
White to play:

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

Solution:

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)

(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]

jeromie · #2

I love the title of this post. :lol:

paK0 · #3

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.

Gomoto · #4

@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]

Collection of moves one should not play anymore:

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