BillSpightsElfPositionalJudgmentExercises/Game 10 ELF's Solution

GoGoD 1956-00-00a. Miyashita Shuyo, 8 dan (W) vs. Fujisawa Kuranosuke, 9 dan, 4½ pt. komi

After W38 Black's estimated winrate: 91% (119.7k playouts). Black, Fujisawa, won by resignation.

[Diagram]

Black is ahead

[Diagram]

Elf's continuation of the game

Black plays sente against the White corner and then plays a shoulder hit against White's orphan in the top right. White bolsters his center group and then Black puts pressure on the White group on the top side.

[Diagram]

Elf's continuation of the game, II

W46 invades the bottom right corner. After B51 Black's advantage seems fairly apparent to me.

Earlier play.

[Diagram]

Loss of 10½%

The natural looking B17 loses 10½% according to Elf.

BTW, when I say that a move loses a certain percentage, I mean by comparison with Elf's recommended play, not with Elf's winrate estimate of the previous position, as is often the custom with other comentators.

[Diagram]

Elf's mainline variation for B17

Black tenukies to probe the bottom left corner, leading to a complicated fight.

[Diagram]

Elf's mainline variation for B17 II

White secures a large corner in exchange for outside strength.

[Diagram]

Elf's mainline variation for B17 III

Then White makes a ko in the top left.

[Diagram]

Elf's recommended variation for W18

After the clamp of W18 in the top left, B19 encloses the top right corner. Then W20 invades the bottom right corner, leading to Black building a large sphere of influence on the right side into the center. W26 makes a shoulder hit against the top right corner, and B27 starts a large scale attack against W26. Bear in mind that Elf considers this around 10% worse for Black than the previous variation. :)

[Diagram]

W18 loses 25%

After B17 loses 10½% W18 returns the favor in spades, losing 25%, a real blunder. :blackeye: B19 was the 3-3 attachment in the top left corner. Elf agrees with that choice of plays.

[Diagram]

Elf's mainline after W18

We have already seen Elf's recommendation for W18 , the attachment at C-15. This variation shows Elf's recommended continuation for White after the blunder of W18.

W20 cuts off the 3-3 stone. B25 is played as a sacrifice. B29 makes some strength on the top side in exchange for the corner sacrifice.

[Diagram]

Elf's mainline after W18 II

Next White bolsters his center and then nails down the top left corner. Then Black leans on the bottom left corner to strengthen his group on the left.

[Diagram]

Loss of 11%

A little later in the game, Elf thinks that the solid connection, W26 , loses 11% by comparison with a.

[Diagram]

Kikashi first

Elf says to play this kikashi first. When you see it, it looks kind of obvious. I doubt that Miyashita overlooked this. The bots seem to be less concerned than humans about aji keshi. ;)

[Diagram]

Elf's recommended play after W26

In the game W28 was played at a. Elf prefers the jump in the center by 1%, which is well within any margin of error, but I thought that this variation was of interest. To my mind, leaving the four White stones just sitting there is almost an admission that White's recent play in the center was erroneous.


This is a copy of the living page "BillSpightsElfPositionalJudgmentExercises/Game 10 ELF's Solution" at Sensei's Library.
(OC) 2023 the Authors, published under the OpenContent License V1.0.
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