After
Elf estimates
White's winrate as 90½% with 56.6k playouts.
White won by resignation.
- Click Here To Show Diagram Code
[go]$$Bcm37 White is ahead
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . X X . |
$$ | . . . O . . . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O O O . . . . . . . . . O X . . |
$$ | . . X O X O . . . , . . . . . , X . . |
$$ | . X O X X X O . . . . . . X . X . . . |
$$ | . X O . . . X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Elf's mainline continuation
- Click Here To Show Diagram Code
[go]$$Wcm38 Elf's mainline
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 8 0 . . . . . . . . . . X . X X . |
$$ | . . 9 O . . . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O O O . . . . . . . . . O X . . |
$$ | . . X O X O . 5 . , . . . . 3 , X . . |
$$ | . X O X X X O 7 6 . . . . X 4 X . . . |
$$ | . X O . . . X 1 . . . . . . . . . . . |
$$ | . . . . . 2 . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Kato played the two step hane. The rest is Elf's variation.
plays a hanging connection to secure the Black group. Then
takes kikashi against the bottom right corner, then
makes a trumpet connection. Black takes kikashi against that and then invades the top left corner.
- Click Here To Show Diagram Code
[go]$$Wcm48 Elf's mainline, continued
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . 4 . . . . . . . . . . . . . |
$$ | . 8 X X 2 1 6 . . . . . . . X . X X . |
$$ | . . O O 3 7 . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . 5 B O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . 9 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O O O . . . . . . . . . O X . . |
$$ | . . X O X O . O . , . . . . O , X . . |
$$ | . X O X X X O O X . . . . X X X . . . |
$$ | . X O . . . X O . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
eliminates the aji of the
stone.
prevents the extension on the top side with sente, then
secures the corner and creates an open skirt for White.
makes a three space high extension from White's wall. No point in a low extension because of the open skirt.
Black has taken all four corners, but Elf judges White's outside strength to be commanding.
Earlier in the game.
- Click Here To Show Diagram Code
[go]$$B Probe
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . 5 . . . . |
$$ | . . . 2 . . . . . , . . . . . , 1 0 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . c . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . a 8 . . |
$$ | . . . . . . . . . . . . . . . 6 7 . . |
$$ | . . . 4 . . . . . , . . . . . , 9 . . |
$$ | . . . . . . . . . . . . . b . 3 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Through
was a popular fuseki, with the probe,
, regarded as an improvement. However, Elf thinks that
is a minor error, losing 7% to par. Elf prefers
Wa - Bb, Wc. The bots do like the solid connection at
a.
- Click Here To Show Diagram Code
[go]$$Bcm11 Three in a row
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . 7 5 . |
$$ | . . . O . . . . . , . . . . . 6 X O 9 |
$$ | . . . . . . . . . . . . . . . 4 2 1 . |
$$ | . . . . . . . . . . . . . . . . 3 8 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Elf thinks Black made three mistakes in a row.
lost 7% to par,
lost 11½%, and
lost 15½%. All that to capture one stone! After
Elf gives Black a 20% chance to win the game (60.1k playouts).
- Click Here To Show Diagram Code
[go]$$Bcm13 Elf's variation for
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 5 . . |
$$ | . . . . . . . . . . . . . . X 4 3 . . |
$$ | . . . O . . . . . , . . . . . 2 X O . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . . . . . . . . . . . . . . . 1 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . 0 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 8 . . . . . . . . . . . . 6 O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . 7 . . . . . . . 9 . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
extends on the second line, avoiding White's kikashi there.
and
play kikashi against the corner, then
returns to the bottom right corner with the solid connection.
- Click Here To Show Diagram Code
[go]$$Bcm15 Elf's mainline variation for
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 6 5 . . |
$$ | . . . . . . . . . . . 7 . . X 4 3 . . |
$$ | . . . O . . . . . , . . . . . 2 X O . |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . 8 X 1 . |
$$ | . . . . . . . . . . . . . . 0 9 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
makes the solid connection, again preventing the White atari there.
-
penetrate the Black corner.
makes a kind of two space extension, and the White wall is still insecure.
pushes along the fourth line,
blocks, and then
hanes.
- Click Here To Show Diagram Code
[go]$$Bcm25 Elf's mainline variation for , continued
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . . . . . . . . . X . . X O X . . |
$$ | . . . O . . . . . , . . . . . O X O . |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . O X X . |
$$ | . . . . . . . . . . . . 4 . O X . . . |
$$ | . . . . . . . . . . . . . . 2 1 . a . |
$$ | . . . . . . . . . . . . . 5 3 6 . . . |
$$ | . . . , . . . . . , . . . . . 8 . 0 . |
$$ | . . . . . . . . . . . . . . 9 7 b . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
at
a,
at
b extends on the fourth line,
pushes, and
block again.
protects against the cut, and
stands.
cuts, and the fight is on.
- Click Here To Show Diagram Code
[go]$$Bcm17 Elf's mainline variation for
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . 8 . . . B 2 . X . |
$$ | . . . O . . . . . , . . . . . O X W 1 |
$$ | . . . . . . . . . . . 0 . . . O O X . |
$$ | . . . . . . . . . . . . . . . 4 X a . |
$$ | . . . . . . . . . . . . . . . 6 5 . . |
$$ | . . . . . . . . . . . . . . . . 7 . . |
$$ | . . . . . . . . . . . . . . 9 . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 3 O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
captures the
stone, also preventing the atari at
a. After the probe and crosscut, preventing the White atari at
a becomes a prime objective for Black. The Black shape with five stones surrounding the eye formed by capturing the single White stone appears in textbooks as a good way for White to sacrifice that stone. Elf really doesn't seem to like that shape.
penetrates the corner, cutting off the
stone.
gets the cut in the bottom right. That is a rare treat, as the bots love the solid connection so much.
and
push along the fourth line, building a wall, then
extends on the top side.
takes the double keima, and then
protects White's incipient territorial moyo.
Back to the game.
- Click Here To Show Diagram Code
[go]$$Wcm20 Big moves
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . X X . |
$$ | . . . O . . . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . B O . |
$$ | . . . . . . . . . . . . . . . . 3 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 1 O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . 2 . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The solid connection,
, is big. So is
capturing the
stone in a ladder.
, although joseki, is a mistake, according to Elf, losing 10% to par. Black should save the
stone.
- Click Here To Show Diagram Code
[go]$$Bcm21 Saving Private
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . X X . |
$$ | . . . O . . . . . , . . . . . W X . X |
$$ | . . . . . . . . . . . . . . . W W X . |
$$ | . . . . . . . . . . . . . . . 1 B O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . . . . . . . . . . 8 . . O X . . |
$$ | . . . O . . . . . , . . . . 5 7 X . . |
$$ | . . . . . . . . . . . . . 6 2 X . . . |
$$ | . . . . . . . . . . . . . 4 3 . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Elf recommends
, not only saving the
stone but threatening the
stones as well.
-
play the tenuki joseki in the bottom right.
Back to the game.
After
Elf gives Black a 10½% chance of winning (24.3k playouts). White makes a few minor errors in the bottom left corner, but maintains the 90% lead after Black blunders.
- Click Here To Show Diagram Code
[go]$$Bcm23 Ladder breaker
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . X X . |
$$ | . . . O . . . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . 8 2 6 . . . . . . . . . O X . . |
$$ | . . 7 O 1 . . . . , . . . . . , X . . |
$$ | . 9 4 3 5 . . . . . . . . X . X . . . |
$$ | . . 0 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
is a ladder breaker.
parries it, but Elf thinks that
27 is 7½% better.
extends on the fifth line, offering the corner for outside strength. Elf regards the solid connection at
29 to be 5% better.
- Click Here To Show Diagram Code
[go]$$Bcm33 Blunders
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . X X . |
$$ | . . . O . . . . . , . . . . . O X . X |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X O . |
$$ | . . . 0 . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . a . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O O O . . . . . . . . . O X . . |
$$ | . . X O X 2 8 . . , . . . . . , X . . |
$$ | . X O X X 3 4 7 b . . . . X . X . . . |
$$ | . 1 O . . 9 5 6 . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Elf regards
as a minor error, losing 7% to the
a. But
is a blunder, giving up 18% to par. Even though Black can threaten to break out with sente,
what he gains in the corner is not worth the outside strength that White gets in exchange, according to Elf. Elf says that
should take gote and make the ladder with
b. The two space extension in the actual game loses 13% to par, a blunder when White's winrate is aroundd 90%.
Elf's judgement of the play in the top right corner is particularly instructive, as White's sacrifice comes right out of the textbooks.