Life In 19x19

Posted: **Mon Aug 10, 2020 7:33 pm**

Only move problem.

White to play.

Click Here To Show Diagram Code: [go]$$Wcm18 Where is White's only move? $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X , . . . . . , . . . . . , . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Enjoy!

Posted: **Mon Aug 10, 2020 11:38 pm**

Posted: **Tue Aug 11, 2020 1:54 am**

Two possibilities:

Click Here To Show Diagram Code: [go]$$Wc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X 1 . . . . . , . . . . . , . . . | $$ | . 2 O . O . X . . . . . . . . . . . . | $$ | . . 3 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

The question is: is

necessary?

Click Here To Show Diagram Code: [go]$$Wc Where is White's only move? $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . 6 . . . . . . . . . . . . . | $$ | . X X 1 . . . . . , . . . . . , . . . | $$ | . 2 O 5 O . X . . . . . . . . . . . . | $$ | . . 4 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

If White plays

elsewhere then the group becomes a floating one. If

at

or ko, it's not much better.

Click Here To Show Diagram Code: [go]$$Wc Where is White's only move? $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X 2 3 . . . . , . . . . . , . . . | $$ | . 1 O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

This is more clearly gote for White.
The result is territorially better than the gote variation above.
I read that Uberdude finds White's shape ruined.
I'm not sure which is better.

Click Here To Show Diagram Code: [go]$$Bc Follow up $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | 3 O X O 1 4 . . . . . . . . . . . . . | $$ | . X X X O . . . . , . . . . . , . . . | $$ | . O O 2 O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Right after this, there's ladder aji. White may decide to sacrifice the 4 stones. The first variation doesn't have this aji.

Posted: **Tue Aug 11, 2020 5:46 am**

This seems to preserve white's eye space as well as any move.

Click Here To Show Diagram Code: [go]$$Wcm18 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X , . . . . . , . . . . . , . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . W . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Posted: **Tue Aug 11, 2020 7:48 am**

I'd just play here:

or maybe here:

Posted: **Tue Aug 11, 2020 9:33 am**

Posted: **Tue Aug 11, 2020 12:34 pm**

I'm highly skeptical of tenukiing to a corner. With Bill's #42 still in mind, I'm seeing honte moves in my sleep.

But I don't like playing the corner either. My gut says that a five point move in gote close to black's strength can't be best.

Perhaps there is a possibility in between.

Click Here To Show Diagram Code: [go]$$Wcm18 A compromise: not corner, but not tenuki. $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X , . . . W . , . . . . . , . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Posted: **Tue Aug 11, 2020 2:23 pm**

Joaz Banbeck wrote:This seems to preserve white's eye space as well as any move.

$$Wcm18
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X X . . . . . . . . . . . . . . . . |
$$ | X . X O . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . O X O . . . . . . . . . . . . . . . |
$$ | . X X , . . . . . , . . . . . , . . . |
$$ | . . O . O . X . . . . . . . . . . . . |
$$ | . . W . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
Click Here To Show Diagram Code
[go]$$Wcm18 $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X , . . . . . , . . . . . , . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . W . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Not as well as this move, which I can only see advantages and no disadvantages over your move, except perhaps making the opponent lose concentration from the shock of such a bizarre move! How can you go from so right on the last problem to so wrong here?!

Click Here To Show Diagram Code: [go]$$Wcm18 $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X , . . . . . , . . . . . , . . . | $$ | . W O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Posted: **Tue Aug 11, 2020 3:40 pm**

Bill Spight wrote:Only move problem.

White to play...
Enjoy!

Huh? But you said...

Bill Spight wrote: "Tenuki is always an option!"

Posted: **Tue Aug 11, 2020 4:11 pm**

ez4u wrote:
Bill Spight wrote:Only move problem.

White to play...
Enjoy!
Huh? But you said...
Bill Spight wrote: "Tenuki is always an option!"

Posted: **Tue Aug 11, 2020 4:17 pm**

A hideous insidious riddle it is

I thought about B3

(mild) spoiler

Posted: **Wed Aug 12, 2020 9:15 pm**

The game is GoGoD 1600-00-00d, between Honinbo Sansa (W) and Rigen. Sansa's play in the top right corner got 0 rollouts, for a loss of 17½% to par, according to Elf.

Game continuation

Click Here To Show Diagram Code: [go]$$Wcm18 Mistake after mistake $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . d . . . . . . . . . . . . b . . | $$ | . . . c . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . 1 . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . 4 . . . . . . . . . . . . . | $$ | . X X 2 3 . . . . , . . . . . a e . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Rigen pushed through with

and then peeped with

, another mistake that loses 14½% to par. Elf prefers to play in another corner at one of a - e.

Click Here To Show Diagram Code: [go]$$Bcm21 Mainline variation for :b21: $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . 4 . 3 . . | $$ | . . 2 , . . . . . , . . . . 6 5 . . . | $$ | . . . . . . . . . . . . . . . O 7 . . | $$ | . . . . . . . . . . . . . . . 8 9 . . | $$ | . . . . . . . . . . . . . . . 0 . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X X O . . . . , . . . . . 1 . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf's top choice for

is on the 4-4 in the bottom right corner, with 68.8k rollouts. After

occupies the last open corner Black invades the top right corner with

. A standard joseki follows, where White builds a wall and Black makes territory.

Click Here To Show Diagram Code: [go]$$Bcm31 Mainline variation for :b21:, continued $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . a d . . . . . . O . X . . | $$ | . . O b . . . . . , . . . . O X . . . | $$ | . . . . . . . . . . . . . . . O X . . | $$ | . . . . . . . . . . . . . . . O X . . | $$ | . . . . . . . . . . . . . . . O 1 . . | $$ | . . . . . . . . . . . . . . . 2 . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . c 3 . . . . . . . . . . . . | $$ | . X X X O . . . . , . . . . . X . . . | $$ | . 4 O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf's choice for

is the one space jump, but a - d are all playable.

plays to secure the corner.

Only play: Solid wall

Click Here To Show Diagram Code: [go]$$Wcm18 Solid wall. Only play. $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X 1 . . . . . , . . . . . , . . . | $$ | . . O . O . X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf's choice, the connection at

, gets a whopping 143.8k rollouts. No other play gets as many as 1500 rollouts. If there is another reasonable play, Elf did not find it.

Click Here To Show Diagram Code: [go]$$Bcm19 Mainline variation $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 1 . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . 3 . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . 9 7 . . | $$ | . X X O . . . . . , . . . . 8 5 2 . . | $$ | . . O . O . X . . . 4 . . . . 6 0 . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

After

the players occupy the open corners, and then

plays a three space pincer on the bottom side.

replies with an attachment against

.

hanes on the 3d line and then

plays a counter-hane towards the right side. Atari, connect-connect follow.

Click Here To Show Diagram Code: [go]$$Bcm29 Mainline variation, continued $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . 6 . . . . . X X . . | $$ | . X X O . . . 2 . 4 3 5 . . O X O . . | $$ | . 1 O . O . B . . . O . . . . O O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

pushes into the bottom left corner and then

plays a shoulder hit against the long ago pincer,

. Then

plays a 4th line contact play to commence reducing the bottom side.

We have had an earlier problem in this series where the connection to make a solid wall was the answer. But in this case that choice got a humungous number of rollouts, with no other play worth mentioning. I couldn't resist.

In this problem the pincer stone was quite close, too close for comfort to a solid wall, and there were no other distractions, except the open cornerns.

Not that White hasn't lost ground in the process of sacrificing two stones on the left side, but now that we have come so far, making a strong wall looks like the best bet by far.

Posted: **Wed Aug 12, 2020 10:10 pm**

Click Here To Show Diagram Code: [go]$$Wcm18 katago evals: $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . a . . . . . , . . . . . c . . . | $$ | . . . . . . . . . . . . . . . d . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X b . . . f . , . . . . . , . . . | $$ | . e O . O . X . . . . . . . . . . . . | $$ | . . g . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Code: Select all

a - 4-4 upper left  : White 49.5%  -0.1pts  (Kata's choice)
b - solid connect   : White 47.1%  -0.2pts  (Elf's "only move")
c - 4-4 upper right : White 46.8%  -0.2pts
d - 5-4 upper right : White 41.5%  -0.9pts  (Game move)
e - shoulder hit    : White 43.6%  -0.7pts
f - block corner    : White 36.1%  -1.7pts
g - descend         : White  4.3% -10.2pts

Kata is not so insistent about connecting. It's a good move, but so is taking the corners. If White takes a corner, Kata also thinks Black can choose taking a corner or playing the forcing push.

Posted: **Wed Aug 12, 2020 10:28 pm**

yoyoma wrote:
$$Wcm18 katago evals:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . a . . . . . , . . . . . c . . . |
$$ | . . . . . . . . . . . . . . . d . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X X . . . . . . . . . . . . . . . . |
$$ | X . X O . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . O X O . . . . . . . . . . . . . . . |
$$ | . X X b . . . f . , . . . . . , . . . |
$$ | . e O . O . X . . . . . . . . . . . . |
$$ | . . g . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
Click Here To Show Diagram Code
[go]$$Wcm18 katago evals: $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . a . . . . . , . . . . . c . . . | $$ | . . . . . . . . . . . . . . . d . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X . . . . . . . . . . . . . . . . | $$ | X . X O . . . . . . . . . . . . . . . | $$ | . X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . . . . . . . . . | $$ | . X X b . . . f . , . . . . . , . . . | $$ | . e O . O . X . . . . . . . . . . . . | $$ | . . g . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]
Code: Select all
a - 4-4 upper left  : White 49.5%  -0.1pts  (Kata's choice)
b - solid connect   : White 47.1%  -0.2pts  (Elf's "only move")
c - 4-4 upper right : White 46.8%  -0.2pts
d - 5-4 upper right : White 41.5%  -0.9pts  (Game move)
e - shoulder hit    : White 43.6%  -0.7pts
f - block corner    : White 36.1%  -1.7pts
g - descend         : White  4.3% -10.2pts
Kata is not so insistent about connecting. It's a good move, but so is taking the corners. If White takes a corner, Kata also thinks Black can choose taking a corner or playing the forcing push.

This is great!

Elf apparently developed a blind spot that kept it from exploring alternatives. It is extremely rare for it to like a play so much that it gives it over 100k rollouts.

How many rollouts does KataGo give these different options?

Posted: **Thu Aug 13, 2020 1:11 am**

I've seen Elf (v2 I think) have a blindspot and some % winrate change when shown the shockingly unusual move 3 of a 3-4 point instead of a 4-4. Other bots are less blinkered and more reliable for analysis IMO.

Life In 19x19

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