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 Post subject: Lost points from mid to end game
Post #1 Posted: Wed May 11, 2022 8:23 am 
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Today I played a game against a 9k AI on OGS and analysis on AI Sensei seggests that by move 139, I had a lead of around 14 points, but it got slowly chipped away and I lost by 8.5 points. I was wondering if there were any general themes or common errors that others notice that are contributing factors I could work on. Any suggestions are much appreciated!!

I played black.


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43655586-232-doge_bot_4-ChrisBecker.sgf [2.56 KiB]
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 Post subject: Re: Lost points from mid to end game
Post #2 Posted: Thu May 12, 2022 8:54 am 
Judan
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If you present it like this, it is easier for people to review.
Note how the sfg tag is used here.


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 Post subject: Re: Lost points from mid to end game
Post #3 Posted: Thu May 12, 2022 9:31 am 
Judan
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The first eight moves are reasonable, but your game turns inward on move 9.
This is a bad exchange for you.

Click Here To Show Diagram Code
[go]$$B Moves 9 to 10
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . X . . . . . |
$$ | . . . B . . . . . . . . . . . O . . . |
$$ | . . 9 . . . . . . . . . . . . . . . . |
$$ | . . O 0 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


The circled stone is a high stone. It is not territorial. Trying to make it part of a territorial group this early is a misuse of its potential.

If you are really concerned about his C12 stone, this is more consistent and thematic:

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . X . . . . . |
$$ | . . . B . . . . . . . . . . . O . . . |
$$ | . . . . 9 . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


However, that is still giving the C12 stone more credit than it deserves.

If you want to limit white's expansion on the left side, do it on a large scale, like this:


Click Here To Show Diagram Code
[go]$$Bc Play a stone in the biggest open space on a side.
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . X . . . . . |
$$ | . . . B . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . O . . . |
$$ | . . . . . 9 . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Or, my favorite would be to ignore the left side completely, and capitalize on his failure to finish the joseki over on the right:


Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . X . . . . . |
$$ | . . . B . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 9 . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


In summary:

1) Think large scale. Look at the whole board.

2) Look at https://senseis.xmp.net/?HighAndLowMoves

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 Post subject: Re: Lost points from mid to end game
Post #4 Posted: Thu May 12, 2022 3:36 pm 
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Thank you very much for your time and help!

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 Post subject: Re: Lost points from mid to end game
Post #5 Posted: Thu May 12, 2022 10:47 pm 
Gosei
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The main reason why you lost points at the end of the game is that, at move 161 and onwards, you missed H10 which destroys a lot of white territory, and made a lot of small moves instead. But I'd say that's not the main reason why you lost the game. Generally you were too defensive. See for instance Joaz Banbeck's last diagram: watch your opponent's groups, and if you can find a weak group, try to attack it.

Other remarks:

  • Move 23 is better at S7. If White responds with R8 then Black keeps sente while not giving White too much strength.
  • Move 27 is big but passive. How about putting pressure on the weak group D12 or on the stone Q14? D4 is not very strong either, a pincer at H3 may be interesting.
  • Move 47: White didn't defend the corner, don't you want to continue attacking it?
  • Move 55: are you afraid of the cut? Suppose White cuts, can you find a way to capture the cutting stones?
  • Move 103: you are not defending many points. There are bigger points elsewhere.
  • Move 129: save one stone?? There are bigger points elsewhere. For instance R18 (then White S18, Black Q18, White S19) reduces the corner in sente.

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 Post subject: Re: Lost points from mid to end game
Post #6 Posted: Sun May 15, 2022 1:06 pm 
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Thank you for pointing those out - they were helpful. I think you're right - I get scared and try to defend everything =).

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 Post subject: Re: Lost points from mid to end game
Post #7 Posted: Sun May 15, 2022 1:25 pm 
Judan
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Also, the invasion at 31 is suicidal. It forces white to split your groups so that he can attack both. I'm amazed that your left side group did not die.

I would have slid under with B4.

Or, if I were really determined to invade, I would have delayed the invasion by attacking his left side group with something like F10. Then, when the group has a clear path to go eastward or has enough territory for eyes, I would invade.

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 Post subject: Re: Lost points from mid to end game
Post #8 Posted: Mon May 16, 2022 12:40 pm 
Lives in gote

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One thing that pops up when I watch this game is this: small knights can be cut :) I notice that black has a tendency to play a small knight and white almost always immediately cuts it off.

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