Many thanks Ed

Finding the atari was easy, once you told me. I totally agree about the importance! I had similar situations before, though without the crosscut, and just blocked below (my opponents too). I’ll try out some variations with supporting white stones in the corner to stock up my toolbox.
$$c Atari
$$ . . . . . . . . .|
$$ . . . . X . . . .|
$$ . . X . O X . . .|
$$ . . . . 1 . . . .|
$$ . . . . . . . . .|
$$ . . . . . . . . .|
$$ --------------
- Click Here To Show Diagram Code
[go]$$c Atari
$$ . . . . . . . . .|
$$ . . . . X . . . .|
$$ . . X . O X . . .|
$$ . . . . 1 . . . .|
$$ . . . . . . . . .|
$$ . . . . . . . . .|
$$ --------------[/go]
$$c Continuation
$$ . . . . . . . . .|
$$ . . . 3 X . . . .|
$$ . . X 2 O X . . .|
$$ . . 5 4 1 . . . .|
$$ . 9 8 6 7 . . . .|
$$ . . . . . . . . .|
$$ --------------
- Click Here To Show Diagram Code
[go]$$c Continuation
$$ . . . . . . . . .|
$$ . . . 3 X . . . .|
$$ . . X 2 O X . . .|
$$ . . 5 4 1 . . . .|
$$ . 9 8 6 7 . . . .|
$$ . . . . . . . . .|
$$ --------------[/go]
Corrected diagram in post #10, i leave that here so that the following posts still make sense
$$c Original Situation
$$ . . . . . . . . .|
$$ . . . 3 X O . . .|
$$ . . X 2 O X 9 . .|
$$ . . 5 4 1 8 . . .|
$$ . . . 6 7 . . . .|
$$ . . . . . . . . .|
$$ --------------
- Click Here To Show Diagram Code
[go]$$c Original Situation
$$ . . . . . . . . .|
$$ . . . 3 X O . . .|
$$ . . X 2 O X 9 . .|
$$ . . 5 4 1 8 . . .|
$$ . . . 6 7 . . . .|
$$ . . . . . . . . .|
$$ --------------[/go]
Ed Lee wrote:
Cross-cuts are notoriously difficult. That's probably why W played

.
However, there's a basic shape here that's very nice to learn.
Do you mean this one?:
http://senseis.xmp.net/?AtariFromCrosscutIt will take some time to work through this.
Ed Lee wrote:There are no doubt many more mistakes in the fundamentals …
And many a thread about it! And maybe even more opinions on the definition

A bit frustrating for me, since i like a structured approach, but for the moment i think it’s best to keep on playing, reviewing, getting reviewed.
Though "First Fundamentals" looks very tempting …