I tried to analyse this with Leela, unfortunately for this particular game she's not very useful to me. Or, to phrase is another way: I'd like a human explaining me where things go wrong, using words instead of a silent neural network
The game is as following:
I am black in this particular game.
I lose the game at move 256. I tried to read out the block at B2, but I missed the extra liberty because that white stone in atari, and I let my corner turn into a seki, game losing move. Very sad to lose the game in such a late state. Especially with 19 minutes left on the clock, it is deserving that I lose the game that way and shame on me. I should read that for 15 minutes if it takes, because it will decide the game. Unfortunately I've had a rather bad day personally and after all that and 255 moves in this game, I was spent. So I lose, very deservingly.
However, that is not the question.
The game could've been decided earlier, I think. And it's something that shows up so much in my games, it's a major weakness.
That is attack.
I almost never kill anything. But that's not catastrophic, things often don't need to die.
I almost never profit from attacking, that is too big a problem.
Does anyone have tips for me, or show me the error in my thinking with the above game? I've read Attack and Defense so many times now, but it's not sinking in, I'm still doing it completely wrong.
And let's face it, this game had plenty of attacking possibilities. White was weak several times. Did I ever take advantage? Only once, for a capture of a few stones. (big capture, though, but still I feel I should've gotten way more out of this game)
Attacking is my biggest failure of this game.
And I really do hate seki
It's ruined dozens of CrazyStone games for me, and now here.
Is there some kind of rule for knowing when you need to enforce your corner? Because I hate plucking down stones that take away points, but when my opponent turns it into seki, it's even worse.
Still, I want to kick the habit of placing stones "just to make sure". I'd rather have my corner turn seki 1000 times and eventually learn the difference than forever lose points by overly defending.
I really thought that corner was safe. Well, it actually was, but we've gone over that
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Ian Butler
: Attack D16, or M17, or R14, rather than playing dame. I understand that you don't want to get sealed in, but you're not one move from getting sealed in, and White has more to worry about than you do.
: Attack M17. Same goes in general through 
or so.
: If you are going to play in this area, you are pretty strong on both sides and he has a single stone, attack! Capping with F7 looks fun. I don't know if it's really the best move but the spirit is the important thing.
: K18 looks like it works?
, you should have played 
, which fixes the problem that caught you later and happens to be absolute sente. Why? Assume White atari's your three stones next. Should you connect? No! You should exploit your previous play and capture the White stones at the bottom. White cannot play from behind until she connects at the marked point at K7.
is aji keshi. (Actual game.)
cuts. How can White capture it?
, 
is a double atari. Oops! 
plays atari, 
. Bingo! 
you propose to push to create weaknesses. It was my first thought, but then I remembered the saying: don't push unless you're going to cut. Or perhaps it doesn't count here because if white doesn't defend I can cut so he'll be weaker and it'll still be my sente?
your variation was the natural move for me, I almost played it without thinking. Then I started thinking, and I guess I thought wrong 
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