In the Elf commentaries Elf, assuming area scoring and 7½ pts. komi, estimated the winrate for one player as 90½% (58.5k rollouts) after . Which player was it?
Black has two corners and a half. White's moyo on the top has an open skirt. Black's Q13 group is weak, but so is R12. In addition, Black is more advanced than White towards the center. So overall, I prefer Black.
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Black has two weak groups. Therefore white is winning.
Is that too simplistic? There's almost nothing that looks like white territory, and white's P17 group looks weak. But I can't see how black could seriously attack that group without getting into trouble at the top left.
In the Elf commentaries Elf, assuming area scoring and 7½ pts. komi, estimated the winrate for one player as 90½% (58.5k rollouts) after . Which player was it?
- are all Elf's top choices. Shusai is seeking complications. Elf's top choice for is a, but it gives Shusai's hane a slightly better winrate for White. Both moves lead to complicated fights. It seems like the main idea of a is to bolster the White wall by sacrificing the other White stones in the top right. The next diagram shows Elf's mainline after Shusai's hane.
makes a solid connection and then saves his group on the right side. Then attacks the White wall. plays kikashi against the corner, and then attaches for sabaki. pulls back, preventing a hane or crosscut there. runs out towards the center.
The extension, , is joseki and it checks Black's development on the left side, in particular a pincer. I don't think that this play would have come in for criticism before the AI era.
- may be best in a no komi game, but Elf, assuming a 7½ komi, docks 11½% and 10%. For both plays Elf prefers the enclosure at a, which prevents the 3-3 invasion.
is unappetizing in a no komi game, as it allows Black to make two enclosures. Black has an easy opening, now. plays a taisha against . Before the AI era White could hardly have predicted the slide at , which seems passive. approaches the high enclosure in the bottom left and pincers. is interesting, a jump instead of making a base at a. It is not as though Black has a strong attack against and .
After , pincers White's two stones in the top right corner. It goes against the grain, at least psychologically, for White to be attacked by Black instead of attacking Black in a no komi game. Again, Black has an easy opening. But these diagrams illustrate the value Elf places on the bottom right enclosure.
- are all Elf's top choices. I find of some interest. OC, it is joseki, but one strategy for White, it seems to me, going back at least as far as Dosaku, is to sketch out a very loose sphere of influence, which we cannot even call a moyo. If Black comes in, he can be attacked. In this game White eventually made a moyo, which Black invaded — twice.
Elf thinks that loses 9½% to the more solid play at a. is an anti-shape play, preventing a Black block there, but Elf thinks that it loses 14% to par. is a creative idea, but Elf docks it 15% versus the solid connection at a and the 3-3- invasion at b. Elf regards as White's largest mistake so far, losing 16½% to par. White's play here seems altogether too passive. In the top right, Elf thinks that and are minor errors, that each one would have been better at c. With perhaps White was pursuing the strategy I mentioned before.
White makes nice territory in exchange for Black's attack. Good for White, says Elf. (Black's top left group has problems, too.) This diagram shows why Elf did not like Black's jump to .
is a nice sacrifice tesuji. After Black has made thickness, but White has taken a good bit of profit.
Elf's variations rarely last so long, especially since got only 29.6k rollouts. But it is pretty much a one lane road, with few rollouts lost per move to alternatives.
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White lost ground in the opening, which is normal in no komi games, but he blew more than 30% in two moves in the top left, by not being aggressive enough.
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I first looked at the upper left. B's shape is bizarre. On the other hand, W's isn't much better, having an extra move on the side for little gain. Probably it is slightly better for W locally.
However, the upper right is a disaster for W it seems. Even with the next, move W owes a big territorial move at the top and on the right with bad heavy shape on both sides. W will get to counterattack the centre in return but profit in the centre isn't easy when there is so much shape. Worst of all, B has the next move to play P18. After say O17 to maintain the threat of S17, B can play R10 after which W is almost dead. And then aim at R4 to continue the attack. G15 isn't attacking much nor building when B is out in the centre.
check: not quite right as B doesn't need to defend the corner yet. And my direction of attack was wrong.
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Bill Spight
. Which player was it?
- 
are all Elf's top choices. Shusai is seeking complications. Elf's top choice for 
is a, but it gives Shusai's hane a slightly better winrate for White. Both moves lead to complicated fights. It seems like the main idea of a is to bolster the White wall by sacrificing the other White stones in the top right. The next diagram shows Elf's mainline after Shusai's hane.
saves his group on the right side. Then 
attacks the White wall. 
plays kikashi against the corner, and then 
attaches for sabaki. 
pulls back, preventing a hane or crosscut there. 
runs out towards the center.
, is joseki and it checks Black's development on the left side, in particular a pincer. I don't think that this play would have come in for criticism before the AI era. 
occupies the last open corner, a kind of tedomari. 
- 
may be best in a no komi game, but Elf, assuming a 7½ komi, docks 
. Before the AI era White could hardly have predicted the slide at 
, which seems passive. 
pincers. 
is interesting, a jump instead of making a base at a. It is not as though Black has a strong attack against 
.
are all Elf's top choices. I find 
loses 9½% to the more solid play at a. 
is an anti-shape play, preventing a Black block there, but Elf thinks that it loses 14% to par. 
is a creative idea, but Elf docks it 15% versus the solid connection at a and the 3-3- invasion at b. Elf regards 
as White's largest mistake so far, losing 16½% to par. White's play here seems altogether too passive. In the top right, Elf thinks that 
and 
are minor errors, that each one would have been better at c. With 
at 
stones.
, 
does not go quietly, but makes a fight of it. 
threatens the Black corner group. Black does not want White to play at 27.
at 
After