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KataGo @ Igo Hatsuyoron 120

https://lifein19x19.com/viewtopic.php?t=16995

Page 3 of 7

Re: KataGo @ Igo Hatsuyoron 120

Posted: Mon Oct 28, 2019 8:38 am
by Cassandra
Bojanic wrote:Found it on your site, it is a bit difficult to navigate.
Sorry, but the problem is so overwhelming complex.

And my knowledge of website design was not sufficient to do have more than static html.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Sat Dec 07, 2019 6:54 pm
by sorin
There was an update on this posted yesterday, very fascinating read! https://blog.janestreet.com/deep-learni ... the-world/

Re: KataGo @ Igo Hatsuyoron 120

Posted: Sat Dec 07, 2019 8:15 pm
by Gomoto
Can not go to sleep

My precious ...

Exploring two space high pincer of the 3-4 low approach with the new Kata-Igo network

This looks very exciting

Fascinationg to watch the new opinions on the variations

First there was a digital Go Seigen offering to teach me. Now it feels like the entire Honinbo lineup is visiting and discussing the variations in front of me

I am so grateful

Re: KataGo @ Igo Hatsuyoron 120

Posted: Mon Dec 09, 2019 2:51 pm
by Cassandra
Flying below the radar of area scoring

Lightvector highlighted (and simultaneously warned us all?) that KataGo – using area scoring – will be unable to distinguish between W+1(territory scoring) and W+2(territory scoring). This posting will show how significant his annotation was.
Click Here To Show Diagram Code
[go]$$Wcm120
$$ +---------------------------------------+
$$ | . . . X O . . . . . . . X X . . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X 2 3 O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X . X O O . . |
$$ | O O O O 1 X O O X X O O 6 O X . . X . |
$$ | O X . X . X . O O X O . . . X X X X X |
$$ | O X . X . . . O X X O . X X X X O O O |
$$ | X O O X . X . O X O O X X O O O O X . |
$$ | X X O O X . . O X O . X O O O . X X X |
$$ | X X . O X . . O X O . X O O X X X O O |
$$ | X X O O X . . O X O . X O O O X X X O |
$$ | X O O 5 O X . O X O . X X O O O X O O |
$$ | X O X O 4 X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O . X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
White's bad-shape move at 120 is gote locally, so Black – after inserting some forcing moves – might play tenuki with 125.
Click Here To Show Diagram Code
[go]$$Wcm126
$$ +---------------------------------------+
$$ | . . . X O . . . . . . . X X . . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X . X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X . X . O O X O . . . X X X X X |
$$ | O X . X 4 1 2 O X X O . X X X X O O O |
$$ | X O O X . X 3 O X O O X X O O O O X . |
$$ | X X O O X . . O X O . X O O O . X X X |
$$ | X X . O X . . O X O . X O O X X X O O |
$$ | X X O O X . . O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O . X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
If Black plays away, White's wedge at 126 is best.
Click Here To Show Diagram Code
[go]$$Wcm130
$$ +---------------------------------------+
$$ | . . . X O . . . . . . . X X . . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X . X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X a X 1 O O X O . . . X X X X X |
$$ | O X . X X 2 X O X X O . X X X X O O O |
$$ | X O O X b X O O X O O X X O O O O X . |
$$ | X X O O X 5 . O X O . X O O O . X X X |
$$ | X X . O X 3 . O X O . X O O X X X O O |
$$ | X X O O X 4 . O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O 6 X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
White did not only destroy all of Black's territory in the left centre.
She also keeps her liberty at a, and created an additional approach-move liberty at b.
Click Here To Show Diagram Code
[go]$$Wcm136
$$ +---------------------------------------+
$$ | . . . X O 1 . . . . . 6 X X 5 . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X . X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X . X O O O X O . 7 . X X X X X |
$$ | O X . X X X X O X X O . X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O 3 O X O . X O O O . X X X |
$$ | X X . O X O 2 O X O . X O O X X X O O |
$$ | X X O O X X 4 O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
White 136 and Black 137 are miai.
Finally, White answers at the top right, wedging in at 142.
Click Here To Show Diagram Code
[go]$$Bcm143
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X 2 X X O O . |
$$ | . X . O O O X X X O . . X 3 X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X . X O O O X O . O 1 X X X X X |
$$ | O X . X X X X O X X O . X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Black 143 might be the reply that comes to mind first, but the subsequent sequence will not change the final score.
Click Here To Show Diagram Code
[go]$$Wcm146
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . 1 X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X O X X O O . |
$$ | . X . O O O X X X O . . X X X O O . . |
$$ | O O O O O X O O X X O O X . X . . X . |
$$ | O X . X . X O O O X O 2 O X X X X X X |
$$ | O X . X X X X O X X O . X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Black 147 is sente, ...
Click Here To Show Diagram Code
[go]$$Wcm148
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . O X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X O X X O O . |
$$ | 2 X . O O O X X X O . . X X X O O . . |
$$ | O O O O O X O O X X O O X . X . . X . |
$$ | O X . X . X O O O X O X . X X X X X X |
$$ | O X . X X X X O X X O 1 X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
...but White will capture this stone (and connect) in the very end.
Black 149 continues with the Main Semeai.

The game will still end with W + 2.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Click Here To Show Diagram Code
[go]$$Bcm143
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X a X X O O . |
$$ | . X . O O O X X X O . . X 1 X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X . X O O O X O b Q c X X X X X |
$$ | O X . X X X X O X X O . X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
However, Joachim suggested answering White's wedge (triangled) by giving atari from above, with the move at 143 here.

In principle, this move is a kind of Michael Redmond's kikashi, just played on the other side of the bamboo joint. Black gains an additional liberty at a, being worth one destroyed point of White territory.
(Funnily enough I had to convince Joachim from the validity of the above mentioned effect in this case. Usually, it is Joachim, who has to remind ME of findings that we had a decade ago.)

Black will capture at c, only after White connected at b.

+ + + + +

Let's compare the final board positions:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------------------------------------------------------------------+
$$ - . . . X O O a . . . O X X X O . O X . - . . . X O O P . . . O X X X O . O X . -
$$ - . . . X X O O X O O O X O X O . . O . - . . . X X O O X O O O X O X O . . O . -
$$ - . . . X O X O O . b O X O O O O O . . - . . . X O X O O . P X X O O O O O . . -
$$ - . X O , . X X X O O O X . O O X O . . - . X O , . X X X O O . X . O O X O . . -
$$ - . . X X X X O O O . O X X . X X O O . - . . X X X X O O O . O X X O X X O O . -
$$ - X X X O O O . . . O . O X X X O O O O - X X X O O O . . . O . O X X X O O O O -
$$ - O O O O O X O O . . O O X c X O O X O - O O O O O X O O . . O O O Q X . . X O -
$$ - O X X X X X O O O . O P O X X X X X X - O X X X O X . O O . O e O . X X X X X -
$$ - O X X X X B X O . . O O X X X X . . . - O X X X X Y . O . . O O X X X X . . . -
$$ - O O O X Z X O O . O O X X . . , . X X - O O O X f X . O . O O X X . . , . X X -
$$ - . O O O X O O O . O O X . . . X X X X - X X O O X . O O . O . X . . . X X X X -
$$ - X X O O X O X O . O . X . . X X X . . - X X O O X X . O . O O X . . X X X . . -
$$ - X X O O X X X O . O . X . . . X X X . - . O O O X X . O . O O X . . . X X X . -
$$ - O O O O O X . O . O X X X . . . X . . - O O O O O X . O . O X X X . . . X . . -
$$ - O O X O X X . O . O X O O X X X . . . - O O X O X X . O . O X O O X X X . . . -
$$ - O X X X X X . O . O O O O X O X . . X - O X X X X X . O . O O O O X . X . . X -
$$ - O X . . O X O O . . . O O O O X X . X - O X . . O X O O . . . O O O O X X . X -
$$ - O X X . X O . O O O O O O X . X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ --------------------------------------------------------------------------------+[/go]
In Joachim's variation (at the left), White has two points of territory at the top, at a and at b.
In Joachim's variation, Black has captured two White stones, at c and at o.
The net effect is zero.

In KataGo's variation (at the right), White has one point of territory at e, which is compensated for by Black's point of territory at f.

Eventually, Black's additional point of territory inside his eye at c makes the difference.
The game – following Joachim's tesuji – now ends with W + 1!

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

There can only be one

Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . X O . . . . . . . X X . . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X . . O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X . X O O . . |
$$ | O O O O a X O O X X O O b O X . . Y . |
$$ | O X . X . X . O O X O . . . X X X X X |
$$ | O X . X . . . O X X O . X X X X O O O |
$$ | X O O X . X . O X O O X X O O O O X . |
$$ | X X O O X . . O X O . X O O O . X X X |
$$ | X X . O X . . O X O . X O O X X X O O |
$$ | X X O O X . . O X O . X O O O X X X O |
$$ | X O O . O X . O X O . X X O O O X O O |
$$ | X O X O . X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O . X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Above we found that White's bad-shape move at a is no longer effective, as it is miai with the point of b.

My guzumi (triangled) remains the only effective bad-shape move in this problem :D

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

For your convenience follow the SGFs of both lines:



Re: KataGo @ Igo Hatsuyoron 120

Posted: Mon Dec 09, 2019 5:17 pm
by Bill Spight
I think what y'all are doing is marvelous. :) I haven't studied it to speak of, but there is something here I don't understand. You say that Black147 is sente. OK. I gather that the reason is that White cannot allow Black to make two eyes.
Click Here To Show Diagram Code
[go]$$Wcm146
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . O X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X O X X O O . |
$$ | . X . O O O X X X O . . X X X O O . . |
$$ | O O O O O X O O X X O O X . X . . X . |
$$ | O X . X . X O O O X O 2 W X X X X X X |
$$ | O X . X X X X O X X O 3 X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Just in this little local area Black has captured the :wc: stone, for one point, but White, unless there is something special about this ko, has ⅓ point, on average, towards capturing the Black stone. On average, then, Black has ⅔ pt. However, IIUC, a dame is worth one pt. for Black, and White148 has filled that dame. That means that Black really has, on average, -⅓ pt., while if White simply saves the :wc: stone, Black has 0 pts. and still has the dame. That is, Black147 is a losing sente and Black should not play it. (We're behind the looking glass, but there you go. ;))

Now, if Black does not play B147 here, White, later on, may fill the dame without saving the :wc: stone. In that case the play may go this way locally.
Click Here To Show Diagram Code
[go]$$Wc
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . O X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X O X X O O . |
$$ | . X . O O O X X X O . . X X X O O . . |
$$ | O O O O O X O O X X O O X . X . . X . |
$$ | O X . X . X O O O X O 2 W X X X X X X |
$$ | O X . X X X X O X X O 1 X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
In this case Black takes the ko later rather than sooner, and, as we know, that may be important in a semeai.

So, from what little I understand, it looks like Black147 is a mistake.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Mon Dec 09, 2019 7:43 pm
by Cassandra
Many thanks, Bill, for clarifying this technical issue.

"Ko" is one of my very blind spots.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Wed Dec 11, 2019 2:31 am
by Cassandra
Too much noise for KataGo?
Click Here To Show Diagram Code
[go]$$Bcm143
$$ +---------------------------------------+
$$ | . . . X O O . . . . . X X X O . O X . |
$$ | . . . X X O O X O O . X O X O . . O . |
$$ | . . . X O X O O . . . X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X . . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | . X . O O O X X X O . . X 1 X O O . . |
$$ | O O O O O X O O X X O O X O X . . X . |
$$ | O X . X . X O O O X O . O . X X X X X |
$$ | O X . X X X X O X X O . X X X X O O O |
$$ | X O O X . X O O X O O X X O O O O X . |
$$ | X X O O X O O O X O . X O O O . X X X |
$$ | X X . O X O X O X O . X O O X X X O O |
$$ | X X O O X X X O X O . X O O O X X X O |
$$ | X O O O O X . O X O . X X O O O X O O |
$$ | X O X O X X . O X O X . O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O . . . O X O O X X X X X . O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | . X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Joachim's tesuji in the bamboo-joint seemed to be a quite unusual move, because KataGo did not even consider it, see "original.png" (green = KataGo's prefered move; red = other moves with displayed playouts).

Because the other considered moves were mainly part of the liberty-occupying part of the Main Semeai, so I wondered what would happen, if the other liberties are occupied first, and the bamboo-joint area is left untouched until shortly before the moment when the tail is captured.

The result of KataGo's analysis at this moment can be seen in "delayed.png".
Now, Joachim's tesuji is also KataGo's prefered move!!!

It seems to me that you must be very well aware of what you are doing when using KataGo as a very powerful tool for analysis.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Wed Dec 18, 2019 11:00 am
by Cassandra
Warning: The Semeai Variation is near!

White will choose the Capture Variation to realise her territorial gains at the left, due to KataGo's new atari / capture / connection.

However, if you want to evaluate variations, you have to be aware that the Semeai Variation might be nearer than expected. I had to learn this painfully ...
Click Here To Show Diagram Code
[go]$$B
$$ +-------------------------------------------------------------------------------+
$$ - . . . B O O . . . . O . . . O . O X . - . . . . X X W W . . O . . . O . O X . -
$$ - . . . B X O O X O O O . O . O . . O . - . . . . X O O . O O O . O . O . . O . -
$$ - . . . X O X O O . . O . O O O O O . . - . . . X . X X O . . O . O O O O O . . -
$$ - . X O , . X X X Q O O . O O O , O . . - . X O , X . X O . O O . O O O , O . . -
$$ - . . X X X X O O O . O . . O . . O O . - . . X X X X O O O . O . . O . . O O . -
$$ - X X X O O O X X X O Q O . . . O Q O O - X X X O O O X X X O . O . . . O . O O -
$$ - O O O O @ X O O X X O O . Q . O O . O - O O O O X X O O X X O O P O . O O . O -
$$ - O X X X B X O O O X O Q O . . . . . . - O X X X . X . O O X O . O P . . . . . -
$$ - O X X X B X X O X X O O . . . . O O O - O X X X . X . O X X O O . . . . O O O -
$$ - O O O X B X O O X O O . . O O O O X . - O O O X . X O O X O O . . O O O O X . -
$$ - O O O O X O O O X O O . O O O X X X X - X X O O X . . O X O O . O O O . X X X -
$$ - X X O O X O X O X O O . O O X X X . . - . O O O X . . O X O O . O O X X X . . -
$$ - . O O @ X X X O X O O . O O O X X X . - O O O X X . . O X O O . O O O X X X . -
$$ - O O O @ O X . O X O . . . O O O X . . - O O O X O X . O X O P . . O O O X . . -
$$ - O O X @ B X . O X O . O O X X X . . . - O O X . . X . O X O . O O X X X . . . -
$$ - O X X B B X . O X O O O O X . X . . X - O X X , X X . O X O O O O X . X . . X -
$$ - O X . . O X O O X X X X X X O X X . X - O X . . O X O O X X X X X X O X X . X -
$$ - O X X . X O . O O O O O O X . X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ +-------------------------------------------------------------------------------+[/go]
In the diagrams above, we compare the final position of the Semeai Variations after KataGo's new moves (at the left) with that of Our Solution (at the right).

Legend:
Triangle = plus one point for Black
Square = plus two points for Black
Circle = minus one point for Black
Cross = minus two points for Black

There are 13 plus points for Black, but 16 minus points, so KataGo's variation is three points better than Our Solution.
Our Solution ended with three points for Black, so KataGo's Semeai Variation results in a drawn game. This is only ONE point worse than KataGo's Capture Variation.

+ + + + + + + + + +

An application case:
Let us assume that -- by some magic -- Black was able to reduce White's territory in the upper right by an additional point (without compensation), so that the Capture Variation would end in jigo.
However, Black invested an additional stone, so White will gain an additional prisoner = point when choosing the Semeai Variation, which then will give her the same one point win that she had before.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Wed Dec 18, 2019 7:13 pm
by lightvector
Yeah, I had noticed in some of my explorations with KataGo that actually sometimes it chose the semeai variation (as winning for white) if you sufficiently much had black deviate in a few spots.

The thing is, some of white's gains on the left side costs white some turns or some liberties, but don't actually lose very much in the case that ultimately the semeai variation is chosen. If black spends those extra liberties pushing in the upper right, black improves the capture variation, but those moves *lose* points on the semeai variation.

So given that most of black's ability to balance white's gains comes at the cost of making one variation worse to improve the other, whereas some of white's gains just purely make one variation better without costing in the other, black starts to get squeezed in both variations.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Thu Dec 19, 2019 9:18 am
by Cassandra
A 50 per cent approach-move liberty

Did you ever wonder why the score difference between the Capture Variation and the Semeai Variation with KataGo's new ( & amateurish enhanced) solution is odd (W + 1 vs. Jigo), while this difference was even with Our Solution (B + 5 / B + 3), as well as decades ago?
Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . X O O . . . . O X X X O . O X . |
$$ | . . . X X O O X O O O X O X O . . O . |
$$ | . . . X O X O O . . O X O O b O O . . |
$$ | . X O , . X X X O O . X . O O X O . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | X X X O O O X X X O M O X X X O O O O |
$$ | O O O O O X O O X X O O X . X O O X O |
$$ | O X X X X X O O O X O O O X X X X X X |
$$ | O X X X X X X O X X O O X X X X O O O |
$$ | O O O X X X O O X O O X X O O O O X . |
$$ | O O O O X O O O X O O X O O O . X X X |
$$ | X . O O X O X O X O . X O O X X X O O |
$$ | . . O O X X X O X O . X O O O X X X O |
$$ | O O O O O X . O X O X X X O O O X O O |
$$ | O O X O X X . O X O X O O X X X O O O |
$$ | O X X X X X . O X O O O O X O X O O X |
$$ | O X . . O X O O X X X X X a O X X O X |
$$ | O X X . X O . O O O O O O X O X . O X |
$$ | X X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
Well, the cause is the marked cutting point in the center, which is only valid to a limited extent. It will vanish, if White chooses the Capture Variation with a move at "a", but it will turn into an approach-move liberty, if White follows the Semeai Variation by continuing with a move at e.g. "b".
Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . X O O . . . . O X X X O . O X . |
$$ | . . . X X O O X O O O X O X O . . O . |
$$ | . . . X O X O O . . O X O O . O O . . |
$$ | . X O , . X X X O O . X . O O X O . . |
$$ | . . X X X X O O O . O X X . X X O O . |
$$ | X X X O O O . . . O T O X X X O O O O |
$$ | O O O O O X O O . . O O X . X O O X O |
$$ | O X X X X X O O O . O O O X X X X X X |
$$ | O X X X X X X O . . O O X X X X O O O |
$$ | O O O X X X O O . O O X X O O O O X . |
$$ | O O O O X O O O . O O X O O O . X X X |
$$ | X . O O X O X O . O . X O O X X X O O |
$$ | . . O O X X X O . O . X O O O X X X O |
$$ | O O O O O X . O . O X X X O O O X O O |
$$ | O O X O X X . O . O X O O X X X O O O |
$$ | O X X X X X . O . O O O O X . X O O . |
$$ | O X . . O X O O . . . O . O O X X O X |
$$ | O X X . X O . O O O O O O X . X X O . |
$$ | X X . . X O O O . . . . O X X X X O O |
$$ +---------------------------------------+[/go]
With the Capture Variation, this intersection becomes one point of White territory.
Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . X O O . . . . O X X X O . O X . |
$$ | . . . X X O O X O O O X O X O . . O . |
$$ | . . . X O X O O . . O X O O O O O . . |
$$ | . X O , . X X X O O . X O O O X O . . |
$$ | . . X X X X O O O . O X X O X X O O . |
$$ | X X X O O O X X X O M O X X X O O O O |
$$ | O O O O O X O O X X O O X C X O O X O |
$$ | O X X X X X O O O X O W O X X X X X X |
$$ | O X X X X X X O X X O O X X X X O O O |
$$ | O O O X X X O O X O O X X O O O O X . |
$$ | O O O O X O O O X O O X O O O . X X X |
$$ | X X O O X O X O X O c X O O X X X O O |
$$ | . O O O X X X O X O d X O O O X X X O |
$$ | O O O O O X . O X O B X X O O O X O O |
$$ | O O X O X X . O X O X O O X X X O O O |
$$ | O X X X X X . O X O O O O X . X O O X |
$$ | O X . . O X O O X X X X X X O X X O X |
$$ | O X X . X O . O O O O O O X . X . O X |
$$ | X X . . X O O O . . . . O X X X . O . |
$$ +---------------------------------------+[/go]
With the Semeai Variation, however, due to Black's eye at O13 (and his connection at L6, and White's vanished eye in the centre at M12), White is able to approach at c AND d, only after connecting at the crossed board point before. This connection costs her one point of territory, but in the Semeai Variation only.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Thu Dec 19, 2019 11:38 pm
by Cassandra
lightvector wrote:The thing is, some of white's gains on the left side costs white some turns or some liberties, but don't actually lose very much in the case that ultimately the semeai variation is chosen. If black spends those extra liberties pushing in the upper right, black improves the capture variation, but those moves *lose* points on the semeai variation.

So given that most of black's ability to balance white's gains comes at the cost of making one variation worse to improve the other, whereas some of white's gains just purely make one variation better without costing in the other, black starts to get squeezed in both variations.
Sorry, but this is not how the problem works!
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------------------------------------------------
$$ - . . . B O O . . . . O X X X O . O X . - . . . . X X W W . . O X X X O . O X . -
$$ - . . . B X O O X O O O X O X O . . O . - . . . . X O O . O O O X O X O . . O . -
$$ - . . . X O X O O . . O X O O O O O . . - . . . X . X X O . . O X O O O O O . . -
$$ - . X O , . X X X Q O O X . O O X O . . - . X O , X . X O . O O X O O O X O . . -
$$ - . . X X X X O O O . O X X . X X O O . - . . X X X X O O O . O X X O X X O O . -
$$ - X X X O O O . . . O . O X X X O O O O - X X X O O O . . . O . O X X X O O O O -
$$ - O O O O O X O O . . O O X . X O O X O - O O O O X X O O . . O O O O X . O X . -
$$ - O X X X X X O O O . O O O X X X X X X - O X X X . X . O O . O . O . X X X X X -
$$ - O X X X X X X O . . O O X X X X . . . - O X X X . X . O . . O O X X X X . . . -
$$ - O O O X X X O O . O O X X . . , . X X - O O O X . X O O . O O X X . . , . X X -
$$ - O O O O X O O O . O O X . . . X X X X - X . O O X . . O . O . X . . . X X X X -
$$ - X . O O X O X O . O . X . . X X X . . - . . O O X . . O . O . X . . X X X . . -
$$ - . . O O X X X O . O . X . . . X X X . - O O O X X . . O . O . X . . . X X X . -
$$ - O O O O O X . O . O X X X . . . X . . - O O O X O X . O . O O X X . . . X . . -
$$ - O O X O X X . O . O X O O X X X . . . - O O X . . X . O . O . O O X X X . . . -
$$ - O X X X X X . O . O O O O X O X . . X - O X X , X X . O . O O O O X . X . . X -
$$ - O X . . O X O O . . . O O O O X X . X - O X . . O X O O . . . O O O O X X . X -
$$ - O X X . X O . O O O O O O X X X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ +-------------------------------------------------------------------------------+
$$ - . . . B O O . . . . O . . . O . O X . - . . . . X X W W . . O . . . O . O X . -
$$ - . . . B X O O X O O O . O . O . . O . - . . . . X O O . O O O . O . O . . O . -
$$ - . . . X O X O O . . O . O O O O O . . - . . . X . X X O . . O . O O O O O . . -
$$ - . X O , . X X X Q O O . O O O , O . . - . X O , X . X O . O O . O O O , O . . -
$$ - . . X X X X O O O . O . . O . . O O . - . . X X X X O O O . O . . O . . O O . -
$$ - X X X O O O X X X O O O . . . O O O O - X X X O O O X X X O . O . . . O . O O -
$$ - O O O O O X O O X X O O . O . O O . O - O O O O X X O O X X O O O O . O O . O -
$$ - O X X X X X O O O X O O O . . . . . . - O X X X . X . O O X O . O O . . . . . -
$$ - O X X X X X X O X X O O . . . . O O O - O X X X . X . O X X O O . . . . O O O -
$$ - O O O X X X O O X O O . . O O O O X . - O O O X . X O O X O O . . O O O O X . -
$$ - O O O O X O O O X O O . O O O X X X X - X X O O X . . O X O O . O O O . X X X -
$$ - X X O O X O X O X O O . O O X X X . . - . O O O X . . O X O O . O O X X X . . -
$$ - . O O O X X X O X O O . O O O X X X . - O O O X X . . O X O O . O O O X X X . -
$$ - O O O O O X . O X O . . . O O O X . . - O O O X O X . O X O O . . O O O X . . -
$$ - O O X O X X . O X O . O O X X X . . . - O O X . . X . O X O . O O X X X . . . -
$$ - O X X X X X . O X O O O O X . X . . X - O X X , X X . O X O O O O X . X . . X -
$$ - O X . . O X O O X X X X X X O X X . X - O X . . O X O O X X X X X X O X X . X -
$$ - O X X . X O . O O O O O O X . X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ --------------------------------------------------------------------------------+[/go]
Only territorial gains and losses that are located OUTSITE the Main Semeai area (i.e. not in the immediate vicinity of White's large group on the left nor of Black's large group in the upper right) have an identical effect on both Main Variations (Capture and Semeai Variation).

White gained an absolute advantage of three points (B + 5 / B + 3 ==> B + 2 / Jigo).
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------------------------------------------------
$$ - . . . X O O . . . . O X X X O . O X . - . . . . X X O O . . O X X X O . O X . -
$$ - . . . X X O O X O O O X O X O . . O . - . . . . X O O . O O O X O X O . . O . -
$$ - . . . X O X O O . . O X O O O O O . . - . . . X . X X O . . O X O O O O O . . -
$$ - . X O , . X X X O O O X . O O X O . . - . X O , X . X O . O O X O O O X O . . -
$$ - . . X X X X O O O . O X X . X X O O . - . . X X X X O O O . O X X O X X O O . -
$$ - X X X O O O . . . O . O X X X O O O O - X X X O O O . . . O . O X X X O O O O -
$$ - O O O O O X O O . . O O X . X O O X O - O O O O X X O O . . O O O O X . O X . -
$$ - O X X X B X O O O . O Q O X X X X X X - O X X X . X . O O . O . O . X X X X X -
$$ - O X X X B X X O . . O O X X X X . . . - O X X X . X . O . . O O X X X X . . . -
$$ - O O O X B X O O . O O X X . . , . X X - O O O X . X O O . O O X X . . , . X X -
$$ - O O O O X O O O . O O X . . . X X X X - X . O O X . . O . O . X . . . X X X X -
$$ - X . O O X O X O . O . X . . X X X . . - . . O O X . . O . O . X . . X X X . . -
$$ - . . O O X X X O . O . X . . . X X X . - O O O X X . . O . O . X . . . X X X . -
$$ - O O O O O X . O . O X X X . . . X . . - O O O X O X . O . O O X X . . . X . . -
$$ - O O X O B X . O . O X O O X X X . . . - O O X . . X . O . O . O O X X X . . . -
$$ - O X X B B X . O . O O O O X O X . . X - O X X , X X . O . O O O O X . X . . X -
$$ - O X . . O X O O . . . O O O O X X . X - O X . . O X O O . . . O O O O X X . X -
$$ - O X X . X O . O O O O O O X X X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ +-------------------------------------------------------------------------------+
$$ - . . . X O O . . . . O . . . O . O X . - . . . . X X O O . . O . . . O . O X . -
$$ - . . . X X O O X O O O . O . O . . O . - . . . . X O O . O O O . O . O . . O . -
$$ - . . . X O X O O . . O . O O O O O . . - . . . X . X X O . . O . O O O O O . . -
$$ - . X O , . X X X O O O . O O O , O . . - . X O , X . X O . O O . O O O , O . . -
$$ - . . X X X X O O O . O . . O . . O O . - . . X X X X O O O . O . . O . . O O . -
$$ - X X X O O O X X X O O O . . . O O O O - X X X O O O X X X O . O . . . O . O O -
$$ - O O O O O X O O X X O O . O . O O . O - O O O O X X O O X X O O O O . O O . O -
$$ - O X X X B X O O O X O Q O . . . . . . - O X X X . X . O O X O . O O . . . . . -
$$ - O X X X B X X O X X O O . . . . O O O - O X X X . X . O X X O O . . . . O O O -
$$ - O O O X B X O O X O O . . O O O O X . - O O O X . X O O X O O . . O O O O X . -
$$ - O O O O X O O O X O O . O O O X X X X - X X O O X . . O X O O . O O O . X X X -
$$ - X X O O X O X O X O O . O O X X X . . - . O O O X . . O X O O . O O X X X . . -
$$ - . O O O X X X O X O O . O O O X X X . - O O O X X . . O X O O . O O O X X X . -
$$ - O O O O O X . O X O . . . O O O X . . - O O O X O X . O X O O . . O O O X . . -
$$ - O O X O B X . O X O . O O X X X . . . - O O X . . X . O X O . O O X X X . . . -
$$ - O X X B B X . O X O O O O X . X . . X - O X X , X X . O X O O O O X . X . . X -
$$ - O X . . O X O O X X X X X X O X X . X - O X . . O X O O X X X X X X O X X . X -
$$ - O X X . X O . O O O O O O X . X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ --------------------------------------------------------------------------------+[/go]
Opponent's territory can be also destroyed in an identical manner in both Main Variations IN the Main Semeai area, but these destructions are costly.
In principle, the destructor has to pay in LIBERTIES in the CAPTURE Variation, but in POINTS of territory in the SEMEAI Variation.

White gained a temporary advantage of another five points (B + 2 / Jigo ==> W + 3 / W + 5).
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------------------------------------------------
$$ - . . . X O O . . . . O X X X O . O X . - . . . . X X O O . . O X X X O . O X . -
$$ - . . . X X O O X O O O X O X O . . O . - . . . . X O O . O O O X O X O . . O . -
$$ - . . . X O X O O . . O X O O O O O . . - . . . X . X X O . . O X O O O O O . . -
$$ - . X O , . X X X O O O X . O O X O . . - . X O , X . X O . O O X O O O X O . . -
$$ - . . X X X X O O O . O X X . X X O O . - . . X X X X O O O . O X X O X X O O . -
$$ - X X X O O O . . . O . O X X X O O O O - X X X O O O . . . O . O X X X O O O O -
$$ - O O O O O X O O . . O O X . X O O X O - O O O O X X O O . . O O O @ X . O X . -
$$ - O X X X X X O O O . O O O X X X X X X - O X X X . X . O O . O . O . X X X X X -
$$ - O X X X X X X O . . O O X X X X . . . - O X X X . X . O . . O O X X X X . . . -
$$ - O O O X X X O O . O O X X . . , . X X - O O O X . X O O . O O X X . . , . X X -
$$ - O O O O X O O O . O O X . . . X X X X - X . O O X . . O . O . X . . . X X X X -
$$ - X . O O X O X O . O . X . . X X X . . - . . O O X . . O . O . X . . X X X . . -
$$ - . . O O X X X O . O . X . . . X X X . - O O O X X . . O . O . X . . . X X X . -
$$ - O O O O P X . O . O X X X . . . X . . - O O O X O X . O . O O X X . . . X . . -
$$ - O O X O X X . O . O # O O X X X . . . - O O X . . X . O . O . O O X X X . . . -
$$ - O X X X X X . O . O O O O X O X . . X - O X X , X X . O . O O O O X . X . . X -
$$ - O X . . O X O O . . . O O O O X X . X - O X . . O X O O . . . O O O O X X . X -
$$ - O X X . X O . O O O O O O X X X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ +-------------------------------------------------------------------------------+
$$ - . . . X O O . . . . O . . . O . O X . - . . . . X X O O . . O . . . O . O X . -
$$ - . . . X X O O X O O O . O . O . . O . - . . . . X O O . O O O . O . O . . O . -
$$ - . . . X O X O O . . O . O O O O O . . - . . . X . X X O . . O . O O O O O . . -
$$ - . X O , . X X X O O O . O O O , O . . - . X O , X . X O . O O . O O O , O . . -
$$ - . . X X X X O O O . O . . O . . O O . - . . X X X X O O O . O . . O . . O O . -
$$ - X X X O O O X X X O W O . . . O W O O - X X X O O O X X X O . O . . . O . O O -
$$ - O O O O @ X O O X X O O . W . O O . O - O O O O X X O O X X O O P O . O O . O -
$$ - O X X X X X O O O X O O O . . . . . . - O X X X . X . O O X O . O P . . . . . -
$$ - O X X X X X X O X X O O . . . . O O O - O X X X . X . O X X O O . . . . O O O -
$$ - O O O X X X O O X O O . . O O O O X . - O O O X . X O O X O O . . O O O O X . -
$$ - O O O O X O O O X O O . O O O X X X X - X X O O X . . O X O O . O O O . X X X -
$$ - X X O O X O X O X O O . O O X X X . . - . O O O X . . O X O O . O O X X X . . -
$$ - . O O @ X X X O X O O . O O O X X X . - O O O X X . . O X O O . O O O X X X . -
$$ - O O O @ O X . O X O . . . O O O X . . - O O O X O X . O X O P . . O O O X . . -
$$ - O O X @ X X . O X O . O O X X X . . . - O O X . . X . O X O . O O X X X . . . -
$$ - O X X X X X . O X O O O O X . X . . X - O X X , X X . O X O O O O X . X . . X -
$$ - O X . . O X O O X X X X X X O X X . X - O X . . O X O O X X X X X X O X X . X -
$$ - O X X . X O . O O O O O O X . X X . X - O X X . X O . O O O O O O X . X X . X -
$$ - X X . . X O O O . . . . O X X X X . . - X X . . X O O O . . . . O X X X X . . -
$$ --------------------------------------------------------------------------------+[/go]
In the CAPTURE Variation, White's connection of her single stone at the left gained her two points.
However, she also lost liberties in the process, so Black is able to connect his single stone in the centre, as well as creating an eye (with White prisoner) in the top right, spending this won liberties for his own territorial gain.
In total, White lost two points from her temporary advantage (W + 3 ==> W + 1).

In the SEMEAI Variation, White spent four additional stones for destroying Black territory at the left, but Black added only three stones to his large group in the upper right.
Additionally, due to Black's eye, White has to occupy all cutting points around Black's large group, as well as Black's eye point, so losing another three points in the process.
In total, White lost five points from her temporary advantage (W + 5 ==> Jigo).

Re: KataGo @ Igo Hatsuyoron 120

Posted: Fri Dec 20, 2019 12:05 pm
by dany
Cassandra wrote:A 50 per cent approach-move liberty

Did you ever wonder why the score difference between the Capture Variation and the Semeai Variation with KataGo's new ( & amateurish enhanced) solution is odd (W + 1 vs. Jigo), while this difference was even with Our Solution (B + 5 / B + 3), as well as decades ago?

...
With the Semeai Variation, however, due to Black's eye at O13 (and his connection at L6, and White's vanished eye in the centre at M12), White is able to approach at c AND d, only after connecting at the crossed board point before. This connection costs her one point of territory, but in the Semeai Variation only.
144 White's move should be in M11 instead of M12. its one point better for White in Semeai Variation.
so in both variations the result will be W + 1

Re: KataGo @ Igo Hatsuyoron 120

Posted: Fri Dec 20, 2019 1:40 pm
by Cassandra
dany wrote:144 White's move should be in M11 instead of M12. its one point better for White in Semeai Variation.
so in both variations the result will be W + 1.
Thanks a lot, dany. When thinking about the consequences of Joachim's tesuji of O14 (instead of O12), the Semeai Variation was not yet on our radar ...

Joachim will be very happy now, as he found different scores in both Main Variations a bit disappointing.

Re: KataGo @ Igo Hatsuyoron 120

Posted: Sat Jan 04, 2020 1:16 am
by alreadydone
This is maybe OT, but has anyone tested DNN-based bots (Leela Zero, KataGo, SAI, etc.) on the whole-board endgame problems (attached) in Appendix C of [BW94], including the 9-dan stumping problem [0] and many 9x9 problems? (LZ may be less appropriate due to fixed 7.5 komi.) Additional problems are found in:
http://library.msri.org/books/Book29/files/kim.pdf
http://library.msri.org/books/Book56/fi ... kamura.pdf (4.2. Whole board problems)
https://webdocs.cs.ualberta.ca/~mmuelle ... board.html
https://webdocs.cs.ualberta.ca/~mmuelle ... hesis.html (compressed pdf, A.3, modifications of [BW94] problems; Chapter 7 describes the program Explorer)
https://www.dumbo.ai.kyutech.ac.jp/~tei ... 1slide.pdf (Problems 3 and 4)

I wonder how these problems designed with mathematical theory differ from those from traditional Go practice. I think they likely also require specific training (like what lightvector did for Hatsuyoron 120) to solve. The search would need to be extremely wide and the number of variations/branches may be enormous due to lack of forced moves.
The attachments contain solutions to the [BW94] problems, but only the first moves. It's said in the paper [1] that "Our program Explorer uses this tool to play full board endgames. It plays a nontrivial class of endgame positions perfectly"; Explorer can be downloaded at [2] but only runs in Mac. Also, I can't find SGF files for the "Perfect Play" and "Node Rooms" collections (see [3]) in Mueller's Computer Go Test Collection [4]. Any idea?

[BW94] Berlekamp--Wolfe 1994, Mathematical Go: Chilling Gets the Last Point
[0] https://zhuanlan.zhihu.com/p/33860825 (in Chinese)
[1] https://webdocs.cs.ualberta.ca/~mmuelle ... dgames.pdf (Optimizations as described in 4. Local Move Generation are potentially necessary to solve the problems besides the AlphaZero/KataGo algorithms.)
[2] http://www.computer-go.info/db/oprog.php?a=Explorer or https://www.applefritter.com/node/13972
[3] https://webdocs.cs.ualberta.ca/~mmuelle ... endix.html
[4] https://webdocs.cs.ualberta.ca/~games/go/cgtc/

Re: KataGo @ Igo Hatsuyoron 120

Posted: Fri Jan 10, 2020 11:24 am
by Cassandra
The Variation Tree of our website has been updated:

KataGo's New Move Suggestions

Please let me know if you find any issues ...
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