Questions about a game

Bill Spight · Post by **Bill Spight** » Mon Jul 30, 2018 7:25 am

Thanks to the Leela Elf results I am planning to do a review of this game. OC, there will be things that are above my head, but I believe that I can explain a good bit about Elf's choices.

One thing that struck me was the high number of matches with Leela Elf's top choices. Carlo Metta made 83 plays, 36 of which matched Elf's top choice, or 43%. Reem Ben David made 82 plays, 44 of which matched Elf's top choice, or 54%. Based upon matching, we might think that it was Ben David who cheated.

This simply underscores the inappropriateness of matching for proving cheating, plausible as that idea may seem. I think that the main thing that it shows is that many plays will be obvious or easy at the players' level of play.

Bill Spight · Post by **Bill Spight** » Tue Jul 31, 2018 7:35 am

Click Here To Show Diagram Code: [go]$$Bc Reem Ben David (W) - Carlo Metta $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . 1 . . | $$ | . . . 2 . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . 6 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 5 . . . . . . . . . . . . . . . . | $$ | . . . , 7 9 . . . , . . . . . , . . . | $$ | . . . 4 8 a 0 . . . . . . . . . 3 . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Metta likes the 3-3.

-

are all Leela Elf's top choices. (With the 100k setting.) AlphaGo likes an early

.

and

force White low and support

, preventing a severe attack.

When I started studying games from a few hundred years ago, I was struck at how, in an era of territorial play, players could be content with thickness without apparently doing much with it.

,

and

aren't particularly thick, but they are strong enough.

Ben David thought a long time before playing

, 1 min. 53 sec. Although he might have been thinking about playing at "a" to take sente, my guess is that he was thinking about the fuseki as a whole. That's not a bad idea, but I don't think that my working hypothesis that players are more likely to make a mistake, or a bad mistake, after thinking a long time applies to Ben David.

Click Here To Show Diagram Code: [go]$$Bcm11 A loss of 9% in the winrate $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . , X X . . . , . . . . . , . . . | $$ | . . 1 O O . O . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

I am on record as saying that

is neither necessary nor desirable, despite being joseki. Leela 11 likes

, but Leela Elf agrees with me.

was not even on Elf's radar. Carlo played

after only 14 sec.

Click Here To Show Diagram Code: [go]$$Bcm11 Main line, even game $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . 1 . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 2 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . 3 . . . . . . . . . . . | $$ | . . . , X X . . . , . . . . . , . . . | $$ | . . . O O . O . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

This is Elf's main line, which it thinks leads to an even game.

may provide balance to the 3-3 pts. on the right. Interesting that Elf did not prefer the AlphaGo 3-3 invasion. Also perhaps because of the dual 3-3s on the right.

Click Here To Show Diagram Code: [go]$$Bcm11 Giving back, and then some $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . , X X 2 . . , . . . . . , . . . | $$ | . . 1 O O . O . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Ben David thought for 48 sec. before replying with

. Despite being joseki, Elf thinks that it loses 14%.

Click Here To Show Diagram Code: [go]$$Bcm11 Main line, White 59% winrate $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . a . . . . . . . . . . . . . . . . . | $$ | . 6 X 3 . . . . . . . . . . . . . . . | $$ | . . 4 2 X X . . . , . . . 0 . , . . . | $$ | . . X O O 5 O . . . . . . . . . X . . | $$ | . . . 8 7 . 9 . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Students of AlphaGo will immediately be drawn to

and

. Black chooses

instead of "a". Then

takes advantage of the 3-3, avoiding a severe pincer.

Click Here To Show Diagram Code: [go]$$Bcm11 Giving back, and then some $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . 5 . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . 3 X X 2 . . , . . . . . , . . . | $$ | . . 1 O O . O . . . . . . 4 . . X . . | $$ | . . a . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

is Elf's top choice. Then

(56 sec.) loses 5.6%. (Elf likes "a".) Next,

(7 sec.) loses 7%. It certainly looks too low.

Click Here To Show Diagram Code: [go]$$Bcm11 Main line $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . 7 . . . | $$ | . . . 3 X X 2 . . , . . . . . , . . . | $$ | . . 1 O O 5 O . . . . . . 4 . . X . . | $$ | . . . . . 6 . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf suggests

to weaken White's corner, then the usual

response.

More to come.

Bill Spight · Post by **Bill Spight** » Wed Aug 01, 2018 9:44 am

Click Here To Show Diagram Code: [go]$$Bcm11 Questionable $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . 6 . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf finds

(49 sec.) questionable, to say the least. It thinks that it loses 11.5% winrate. It is not a play that would occur to many people, I think. Elf's top choice conveys an important lesson, IMO.

Click Here To Show Diagram Code: [go]$$Bcm11 Triple purpose play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . O . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . W . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . 6 . . . . . . . . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf likes

. Besides being joseki, it is a triple purpose play. It bolsters the White corner, it starts to form a moyo on the bottom side, and it calls out to

on the left side. This remains a good play for White for some time.

Click Here To Show Diagram Code: [go]$$Bcm17 3-3 invasion joseki $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . 5 6 . . . . . . . . . . . . | $$ | . . 1 3 7 4 . . . . . . . . . . X . . | $$ | . . 2 O 9 8 . . . , . . . . . , . . . | $$ | . . . . 0 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

After

we get one of the modern 3-3 invasion joseki.

Click Here To Show Diagram Code: [go]$$Bcm27 Joseki deviation $$ --------------------------------------- $$ | . . . . 5 . . . . . . . . . . . . . . | $$ | . . . . . B O . . . . . . . . . . . . | $$ | . . X X X O . . . . . . . . . . X . . | $$ | . . O O X O . 4 . , . . . . . , . . . | $$ | . . . a O 1 3 . . . . . . . . . . . . | $$ | . . . . 2 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Carlo took 1 min. 13 sec. for

, indicating that it was a difficult position for him, but he picked Leela Elf's top choice.

(20 sec.) appears to have been a joseki deviation, but Elf thinks that it lost only 3.7%. Reem took 8 min. 23 sec. (

) for

. Not a terribly difficult choice, in my view, versus the atari, but the future is murky. (Maybe he went to the bathroom, too.)

is also Elf's top choice.

Elf thinks that

(34 sec.) lost 10.8%. I think that there is a good lesson, there. (Note: We are now using Elf with the 200k setting.)

is defensive. Besides, if White captures the

stone, then

will become inefficient. But mainly White has a weakness at "a" that Black can exploit.

Click Here To Show Diagram Code: [go]$$Bcm31 Main line, Black lives in sente $$ --------------------------------------- $$ | . . . . . . 7 . . . . . . . . . . . . | $$ | . . . . . B O 5 8 . . . . . . . . . . | $$ | . 3 X X X O 9 6 . . . . . . . . X . . | $$ | . 1 O O X O 0 O . , . . . . . , . . . | $$ | . 2 . . O X X . . . . . . . . . . . . | $$ | . . 4 . O . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . a . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

In Elf's main variation Black starts with the sente at

, then plays the clamp tesuji at

. (If

ataris

, Black ataris back.) White chooses to block with

, and Black lives in sente. Next,

will reduce at "a".

More to come.

Bill Spight · Post by **Bill Spight** » Thu Aug 02, 2018 11:47 am

Click Here To Show Diagram Code: [go]$$Bcm27 Ugly $$ --------------------------------------- $$ | . . . . 5 . . . . . . . . . . . . . . | $$ | . . . . . X O . . . . . . . . . . . . | $$ | . . X X X O . . 6 . . . . . . . X . . | $$ | . . O O X O . 4 . , . . . . . , . . . | $$ | . . . . O 1 3 . . . . . . . . . . . . | $$ | . . . . 2 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

(1 min. 5 sec.) protects against the push and cut, but it sure looks ugly, doesn't it? Elf thinks that it loses 13.6% winrate. (What was Ben David thinking about for almost 8½ minutes on

?)

Elf's choice is a beautiful move.

But once you see it, it's obvious. I'll hide it so that you can try to find it, if you wish.

Click Here To Show Diagram Code: [go]$$Wcm32 Beautiful play! $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | . . . . . X O . . . . . . . . . . . . | $$ | . . X X X O . . . . . . . . . . X . . | $$ | . . O O X O . O . , . . . . . , . . . | $$ | . . . . O B B . . . . . . . . . . . . | $$ | . . . . O . . . . . . . . . . . . . . | $$ | . . . . . . 1 . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . W . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

not only threatens the

stones, it works well with the

stone. Elf estimates White's winrate at 56%.

Click Here To Show Diagram Code: [go]$$Wcm32 No push and cut $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | . . . . . X O 5 . . . . . . . . . . . | $$ | . . X X X O 3 4 6 . . . . . . . X . . | $$ | . . O O X O 2 O . , . . . . . , . . . | $$ | . . . . O B B 7 . . . . . . . . . . . | $$ | . . . . O . . . . . . . . . . . . . . | $$ | . . . . . . 1 . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . W . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf does not give this variation, it is mine.

may not be necessary, but it captures the

stones.

Click Here To Show Diagram Code: [go]$$Wcm32 Invasion $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | . . . . . X O . . . . . . . . . . . . | $$ | . . X X X O . . 1 . . . . . . . X . . | $$ | . . O O X O . O . , . . . . . , . . . | $$ | . . . . O X X . . . . . . . . . . . . | $$ | . . . . O . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 2 . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Carlo invaded with

(2 min. 13 sec.). Elf thinks that it loses 5.5%.

Click Here To Show Diagram Code: [go]$$Wcm32 Reduction $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | . . . . . X O 2 . . . . . . . . . . . | $$ | . . X X X O . . 1 . . . . . . . X . . | $$ | . . O O X O 3 O . , . . . . . , . . . | $$ | . . . . O X X . . . . . . . . . . . . | $$ | . . . . O . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 4 . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf recommends this reduction. The strategic question of whether to invade or reduce is one at which today's top bots excel.

Click Here To Show Diagram Code: [go]$$Bcm33 Simple life $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | 5 3 . . . X O . . . . . . . . . . . . | $$ | . 2 X X X O . . O . . . . . . . X . . | $$ | . 4 O O X O . O . , . . . . . , . . . | $$ | . . . . O X X . . . . . . . . . . . . | $$ | . . a . O . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 1 . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

made the seemingly obvious play to live in the corner. But Carlo spent 3 min. 56 sec. on it. Neither Leela 11 nor Leela Zero like it, and Elf thinks that it loses 8.2%. "a" is a key point. And Leela envisions a possible sacrifice of the Black corner.

Click Here To Show Diagram Code: [go]$$Bcm33 Kikashi before living $$ --------------------------------------- $$ | . . . . X . . . . . . . . . . . . . . | $$ | 7 3 . . . X O 5 . . . . . . . . . . . | $$ | . 2 X X X O 6 . O . . . . . . . X . . | $$ | . 4 O O X O . O . , . . . . . , . . . | $$ | . . . . O X X . . . . . . . . . . . . | $$ | . . . . O . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 1 . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . X . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . X X X O . . , . . . . . , . . . | $$ | . . X O O . O . . . . . . O . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf finds the clamp tesuji, a kikashi before living.

Elf has a number of good lessons for us in this game.

More to come.

Life In 19x19

Questions about a game

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