Interesting tesuji problem and not too difficult (black to play). From a professional game http://www.go4go.net/go/games/sgfview/39072/252
The game would result in W+0.5 if both sides pass now. But there's something wrong in side white's territory.

Click Here To Show Diagram Code

[go]$$W
$$ +---------------------------------------+
$$ | . . . X X X X O . O O O O O O O X . . |
$$ | . . X . X X O O . O X O . . O X X . X |
$$ | . . X X O O X X . O X X X X O X . X X |
$$ | . X X O . . O . . O X . . X X X X O X |
$$ | . X O O . . . . . O O X X O X . X O O |
$$ | . X X O O O . . . O X X O O O O O . O |
$$ | . . . X O X O O X O X X X O X . . . . |
$$ | . . . X X X O X O . O O X O . O . . . |
$$ | . . . X . X X X O O O O X O . . O O . |
$$ | . . . X O O X . X X O X X X O O X O O |
$$ | . . . . X O O X X O O O X X O X X X X |
$$ | . X . . X O O X X X O O O X O O X . . |
$$ | X . . X X O . O X O O . O X . O X . . |
$$ | O X X X O O O O X X X O O X X O O X . |
$$ | O O O X O O X X . X X X O O X X X . . |
$$ | . . O X O O X X . , X O O O O O X . . |
$$ | . . . O O . O O X X . X X . O X X . . |
$$ | . . . . . . . O O X . X O O O O X . . |
$$ | . . . . . . . . O X . X X . O X X . . |
$$ +---------------------------------------+[/go]