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 )
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 
)
Hisai lost this game by the way.
. 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 ) 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]