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 Post subject: Re: Knotwilg's practice
Post #181 Posted: Wed May 27, 2020 6:59 am 
Lives in sente
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So what would have been a better move for 107, and how to use the aji of the cut stones?

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 Post subject: Re: Knotwilg's practice
Post #182 Posted: Wed May 27, 2020 8:22 am 
Gosei
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Posts: 1637
Location: Ghent, Belgium
Liked others: 253
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Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
Click Here To Show Diagram Code
[go]$$ Position at move 106
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . X . . X . O . . . O X . . . |
$$ | . . X , . . . . . , . . . . . X . . . |
$$ | . . . X . . . . . . O . . O . . . . . |
$$ | . . X O . O . . . . . . . . . . X . . |
$$ | . . X O . O X . . . . . . . . . . . . |
$$ | . . X O X O . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . . . . O O . . |
$$ | . O . X O . X . . , . . . B . X X O . |
$$ | . . . O . . . . . . . O . . . . . O . |
$$ | . . . O . O . X . . . . O . . X X O . |
$$ | . . 1 . . . W . X O O O X . . X O . . |
$$ | . . . . . . . 2 X O X X X . O X O . . |
$$ | . . . X . X X X O X X . . O . X X O . |
$$ | . . X , . . O O O X O X X X X X O O . |
$$ | . . X O . . . . . O O O O O O O X X . |
$$ | . . O . O . . . . . . . . . . X . X . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ ---------------------------------------[/go]


The situation is not easy. After BB jumped, WW peeped and then I (Black) played B1.
Katago thinks this is a 14% mistake. Instead, KataGo thinks about 2 other moves.
Before discussing them, let's look at the situation

Click Here To Show Diagram Code
[go]$$ Position at move 106
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . X . . X . O . . . O X . . . |
$$ | . . X , . . . . . , . . . . . X . . . |
$$ | . . . X . . . . . . O . . O . . . . . |
$$ | . . X O . O . . . . . . . . . . X . . |
$$ | . . X O . O X . . . . . . . . . . . . |
$$ | . . X O X O . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . . . . O O . . |
$$ | . O . X O . X . . , . . . X . X X O . |
$$ | . . . O . . . . c . . O . . . . . O . |
$$ | . . . O . O . X . . . . O . . X X O . |
$$ | . . . . . . O . X O O O X . . X O . . |
$$ | . . b . . . . a X O X X X . O X O . . |
$$ | . . . X . X X X O X X . . O . X X O . |
$$ | . . X , . . O O O X O X X X X X O O . |
$$ | . . X O . . . . . O O O O O O O X X . |
$$ | . . O . O . . . . . . . . . . X . X . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ ---------------------------------------[/go]


The big question is if Black has the time (eyespace) to connect at ''a''. Not only can White cut off a couple of stones and build a centre, also White's central stones are currently disconnected and White ''a'' would help a lot.

A blunt connection at ''a'' would make Black very heavy. White can poke at Black's shape with moves like ''b'' or ''c'' (AI favorite).


Click Here To Show Diagram Code
[go]$$ Position at move 106
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . X . . X . O . . . O X . . . |
$$ | . . X , . . . . . , . . . . . X . . . |
$$ | . . . X . . . . . . O . . O . . . . . |
$$ | . . X O . O . . . . . . . . . . X . . |
$$ | . . X O . O X . . . . . . . . . . . . |
$$ | . . X O X O . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . . . . O O . . |
$$ | . O . X O . X . . , . . . X . X X O . |
$$ | . . . O . . . . . . . O . . . . . O . |
$$ | . 3 . O . O 1 X . . . . O . . X X O . |
$$ | . . 4 . . 2 O . X O O O X . . X O . . |
$$ | . . . . . . . . X O X X X . O X O . . |
$$ | . . . X . X X X O X X . . O . X X O . |
$$ | . . X 5 . . O O O X O X X X X X O O . |
$$ | . . X O a . . . . O O O O O O O X X . |
$$ | . . O . O . . . . . . . . . . X . X . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ ---------------------------------------[/go]


Katago suggests a better shape move to guard the connection: :b1:. Then instead of connecting, it suggests another shape point: :b3:. After :b5:, there's an exchange with White taking the center and Black playing ''a'' and capturing. Very high level stuff.

So what's this about? What if White cuts?


Click Here To Show Diagram Code
[go]$$ Position at move 106
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . X . . X . O . . . O X . . . |
$$ | . . X , . . . . . , . . . . . X . . . |
$$ | . . . X . . . . . . O . . O . . . . . |
$$ | . . X O . O . . . . . . . . . . X . . |
$$ | . . X O . O X . . . . . . . . . . . . |
$$ | . . X O X O . . . . . . . . . . . . . |
$$ | . . X X O . . 7 . . . . . . . O O . . |
$$ | . O . X O . X . . , . . . X . X X O . |
$$ | . . . O . . . . . . . O . . . . . O . |
$$ | . 3 . O . O 1 X . . . . O . . X X O . |
$$ | . a 8 . . 2 O 5 X O O O X . . X O . . |
$$ | . . . . . . 6 4 X O X X X . O X O . . |
$$ | . . . X . X X X O X X . . O . X X O . |
$$ | . . X b . . O O O X O X X X X X O O . |
$$ | . . X O . . . . . O O O O O O O X X . |
$$ | . . O . O . . . . . . . . . . X . X . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ ---------------------------------------[/go]

With Black having better shape at :b1: and White worse at :b3: the mutual cut becomes a problem for both. White's left is not as thick as in other variations and his center is in dire straits.

When :w8: presses, Black will be able to connect underneath, provided ''b'' is sente. That's where this move comes from.

Click Here To Show Diagram Code
[go]$$ Position at move 106
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . X . . X . O . . . O X . . . |
$$ | . . X , . . . . . , . . . . . X . . . |
$$ | . . . X . . . . . . O . . O . . . . . |
$$ | . . X O . O . . . . . . . . . . X . . |
$$ | . . X O . O X . . . . . . . . . . . . |
$$ | . . X O X O . . . . 8 7 . . . . . . . |
$$ | . . X X O . . . . . 6 5 . . . O O . . |
$$ | . O . X O . X . . , 4 3 . B . X X O . |
$$ | . . . O . . . . . . . O . . . . . O . |
$$ | . . . O . O . X . . . . O . . X X O . |
$$ | . . 1 . . . W . X O O O X . . X O . . |
$$ | . . . . . . . 2 X O X X X . O X O . . |
$$ | . . . X . X X X O X X . . O . X X O . |
$$ | . . X , . . O O O X O X X X X X O O . |
$$ | . . X O . . . . . O O O O O O O X X . |
$$ | . . O . O . . . . . . . . . . X . X . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ ---------------------------------------[/go]


So, when Black plays :b3: and subsequent, all that aji goes to waste and White gets a big center.


Last edited by Knotwilg on Tue Jun 02, 2020 4:56 pm, edited 2 times in total.
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 Post subject: Re: Knotwilg's practice
Post #183 Posted: Tue Jun 02, 2020 4:54 pm 
Gosei
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Posts: 1637
Location: Ghent, Belgium
Liked others: 253
Was liked: 736
Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
Now that we have AI to review, I'd really like to record my thought process. That's the next step. The best I can do is review my game, add what I think I thought, then review. Here's a recent win.


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 Post subject: Re: Knotwilg's practice
Post #184 Posted: Thu Jun 04, 2020 6:15 am 
Gosei
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Posts: 1637
Location: Ghent, Belgium
Liked others: 253
Was liked: 736
Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
I played 10 games on OGS, following "dwyrin's heuristics" aka "basics":

See https://senseis.xmp.net/?Dwyrin

6 - 4 but really 5 - 5 as one was a lost game won +T

Why did I win?

1) lucky, opponent blundered in a fight
2) good splitting attack, finishing off one of the groups, leaving the other weak
3) proper usage of influence to attack, killing a group
4) winning on thickness and proper direction of play
5) convert central influence into territory

Why did I lose?

1) slack play, failure to kill an invading group
2) acquired central influence but failed to kill an invading group
3) wrong play in middle game joseki, downhill from there (opponent played strong)
4) wrong play in opening joseki downhill from there (same)
5) failure to attack for profit

What does this tell me?

1) I remain an influence oriented player
2) I like to fight and kill but that's not always the right idea or shouldn't be the win condition
3) still get better at killing: play sharper moves and read out more variations faster
4) I should learn more joseki
5) I'm performing at my level of comprehension; I didn't make any mistakes which I could easily identify without AI review

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 Post subject: Re: Knotwilg's practice
Post #185 Posted: Tue Jun 30, 2020 5:33 am 
Gosei
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Posts: 1637
Location: Ghent, Belgium
Liked others: 253
Was liked: 736
Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
Reviewing my latest 8 games with KataGo, zooming in on my mistakes and then categorizing them, this is the result:

Fighting/middle game tactics
• Too confident resisting
• Wrong extension in capturing race (reading)
• Missing a chance to simplify, caught up in the fight
• Don’t bail out of a capturing race if you have many more liberties
• Defend higher up the chain

Shape/technique
• Playing a knight’s move for defence
• Disconnect a big group, while there was a better move that threatened to disconnect a part AND destroy the shape
• Don’t give opportunity to profit in sente
• Wrong shape in a joseki follow up (keima i/o kosumi)
• Wrong shape move

Endgame/sente
• Answering locally while the biggest move was elsewhere (deny profit in sente)
• Wrong local move losing sente
• Small, not severe move
• Just defending territory is small

Strategic choices
• Too territorial choice while splitting was better
• Missing a chance to cut off a major group, focusing on central influence instead
• Don’t reinforce the high 2 space enclosure for mere sabaki
• Attack too close to strength, allow to resist

Invasions/reductions
• Play what looks like a reduction (a shoulder hit) but it’s actually too deep an invasion
• Better Invade where the weakest group is
• Don’t invade just for scooping out territory; instead attack the weakest group

Ko
• Should answer a ko threat by playing another ko locally
• Wrongly evaluate winning the ko vs answering ko threat

Life & Death
• Wrongly evaluate a group to be killable, losing sente

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