A minor point: in fact this bad result for black:

Click Here To Show Diagram Code

[go]$$W
$$ ---------------
$$ | . . 6 . a . .
$$ | . 4 1 2 3 . .
$$ | . X O X 5 . .
$$ | . X X O O . .
$$ | . X O O . . .
$$ | . X X O . . .
$$ | . . O X . . .
$$ | . . O . . . .
$$ | . . . . . . .[/go]

is better for black than:

Click Here To Show Diagram Code

[go]$$Bm21
$$ ---------------
$$ | . . . . . . .
$$ | . . 3 1 2 . .
$$ | . X W X O . .
$$ | . X X O O . .
$$ | . X O O . . .
$$ | . X X O . . .
$$ | . . O X . . .
$$ | . . O . . . .
$$ | . . . . . . .[/go]

Due to the ko yose at a.

Thanks very much for all of that. If I'm understanding the last example correctly, Black is able to at the cost of a dame point (since the point he's giving up isn't going to become territory, he's going to have to fill it in, prevent white from having at least one sente move, even two if he persists, which is clearly worth more than the "not even one point" value of the move.

I see what you are saying, and it was very helpful because taking account of current and future sente is the current thing I'm trying to learn.

Classic question : how do you handle stones near a wall ?
here the distance (please correct if i am wrong) of K16 to the W wall seems ok to me, so does that mean that the stone should be left alone ?
that would hinder the whole W wall purpose ?.
to try to use it, is the corner approach O17 a good idea ?

Click Here To Show Diagram Code

[go]$$Bcm25 Captures:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . . . . . . . . |
$$ | . X . X O . . . . . . . . 2 3 . . . . |
$$ | . X X O O . . . . B . 6 . 4 . X . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . X X O . . . . . . . . . . . 5 . . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , b . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . . . . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . a . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Usually i dislike playing this approach with an enemy stone at K16 as the O17 group is not comfortable but here maybe K16 is more uncomfortable ? a running battle will follow, will the Wall be useful or made irrelevant ?? i cant decide
example of running battle:

Click Here To Show Diagram Code

[go]$$Bcm25 Captures:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . . . . . . . . |
$$ | . X . X O . . . . . . . . 2 3 . . . . |
$$ | . X X O O . . . . B . 6 . 4 . X . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . X X O . . . . . 7 . . . . . 5 . . . |
$$ | . . O X . . . . . . . . 8 . . . . . . |
$$ | . . O . O . . . . 9 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , b . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . . . . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . a . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

i really cant say if i prefer B or W, any insights ?
is O17 a good move locally (B is not forced to play the kick after all but in that case maybe it puts useful pressure on K16 ) ?or O18 ? or something else ?
(for the whole board there might be bigger area like R10,O3 even if O17 is good locally)

Perceval, my immediate feeling is k16 is a bad overplay and too close to the wall. O17 or n17 would be better. When White invades as in your diagrams k16 seems weaker than white's group due to the wall. White has a significant lead already.

Do you mean (a) (and not (b))...

Click Here To Show Diagram Code

[go]$$W
$$ ---------------
$$ | . . . . . . .
$$ | . . 1 . a . .
$$ | . X O X . . .
$$ | . X X O O . .
$$ | . X O O . . .
$$ | . X X O . . .
$$ | . . O X . . .
$$ | . . O . b . .
$$ | . . . . . . .[/go]

...to this result:

Click Here To Show Diagram Code

[go]$$W
$$ ---------------
$$ | . . . . . . .
$$ | . 6 1 4 2 5 .
$$ | . X O X 3 . .
$$ | . X X O O . .
$$ | . X O O . . .
$$ | . X X O . . .
$$ | . . O X . . .
$$ | . . O . . . .
$$ | . . . . . . .[/go]

I think this was a mistake. If it was low it would be harder to chase but I would try to enclose it and try to control the center. Now I will attack since this stone doesn't have a base yet, and is floating around near my wall (which is strong enough). Maybe the keima enclosure toward my wall would be enough for black? Now It will be a battle! but I can't complain

You had the beginning HIDE tag but no ending /HIDE tag for your Post #47, so I added it for you. Hope it's OK.

Jump around! Yeah, I really don't like this situation. Oh well. Who says I have to like it? Anyway, I'm going to enjoy trying to live and run while white totally takes advantage of the situation. It'll be tough to win, but I'm going to do my best.

I decided on being faster with two space. Good or bad decision I wonder:)

I figure this will double. It will give me some eye space and allow me to diminish the value of the white wall. I'm 99.34585857494% sure that I will not die here. After all, I'm too young to die! Just kidding.

I think I jumped the gun a bit earlier on in the game, so I'm just trying to settle here and possibly make something of this.

Argh, hailthorn's thinking is so wrong here. You don't diminish a wall by building two eyes right in front of it whilst your opponent surrounds you in sente. That's exactly what walls are designed to do, transfer their power to other parts of the board by attacking. k12 is the only move, don't get surrounded and also keeps m13 weak. Well, maybe not only, you could consider cutting white's rather thin and overplayish 2 point jump. But that could get hairy and you could do it later once you are out at k12 and safer so can fight harder. White could play l15 peep to fix cut in sente, but that strengthens black and white's shape is still a bit thin.

I must admit that I often commit the exact same type of error as hailthorn here T.T

I guess the mistake which would be normal for me is to attack the two-space-jump, getting surrounded and die

What Uberdude said.
Not exactly the same, but reminds me of: