Recently, I completed a study of some corner capturing races, shoring up a hole in my understanding of how to evaluate the fighting liberties and ko resources present in different kinds of non-two-eyed corner groups.
For example:
$$B Do you know the status of this capturing race?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . X X X O O O O X . .
$$ | X O O O X X X X X . X
$$ | . O . X . . . . . . .
$$ | . . O X . X . . . . .
$$ | . . O O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
- Click Here To Show Diagram Code
[go]$$B Do you know the status of this capturing race?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . X X X O O O O X . .
$$ | X O O O X X X X X . X
$$ | . O . X . . . . . . .
$$ | . . O X . X . . . . .
$$ | . . O O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .[/go]
$$B Or this one?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . X O O O O X . . .
$$ | . X X O X X . X . . X
$$ | X O O X . . . X . . .
$$ | . O . X . X . . . . .
$$ | . . O O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
- Click Here To Show Diagram Code
[go]$$B Or this one?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . X O O O O X . . .
$$ | . X X O X X . X . . X
$$ | X O O X . . . X . . .
$$ | . O . X . X . . . . .
$$ | . . O O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .[/go]
$$B Or this one?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . X X O O O O X . .
$$ | . X X O X X . . X . X
$$ | . O O O O X . X . . .
$$ | . . . . . X . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
- Click Here To Show Diagram Code
[go]$$B Or this one?
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . X X O O O O X . .
$$ | . X X O X X . . X . X
$$ | . O O O O X . X . . .
$$ | . . . . . X . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .[/go]
In the process of learning how the fighting sequences in these corners worked, I ended up creating several dozen capturing race problems. In case anyone else is interested, here is the SGF with all the problems. I designed it offline in CGoban, so I don't know how well it actually works in Eidogo - feel free to try it either way or in any other sgf editor.
Warning: There may be mistakes in this problem set! I'm just a lowly dan player, and my reading is far from perfect
. Many of these problems could be very hard if you are weaker than strong SDK, indeed many were quite hard for me. If you find a mistake, let me know.
EDIT: Fixed a glitch in the SGF that caused Eidogo to erroneously display "Black to play" in some of the problems. They are all status problems and should be solved from both sides.
I did find the small-corner-with-hane positions to actually be some of the hardest. Good reading practice. 