The game is GoGoD 1703-01-11b, a Castle Game between Yasui Senkaku (W) and Inoue Insetsu
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[go]$$Bcm15 Game record
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$$ | . . . X . . . . . . X . . . O X . . . |
$$ | . . . , 1 . . . . X . . . . O , X . . |
$$ | . . O . . . . X . . . O . . . . . . . |
$$ | . . . . . . . . . O . . . a 5 X . . . |
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$$ | . . . . . . . . . . . . . . . 4 2 . . |
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Insetsu played the kosumi at
a, which loses 16% to par (assuming komi). I suspect that it is a mistake with no komi, as well. You can see the attraction of forming a nice sized territory with the 5th line keima.
Elf also reckoned that Senkaku's approach,
, is a mistake. It invites Black to strengthen himself and play where he wants to play. Elf also thinks that
is a mistake by comparison with the jump to
a.
Here is Elf's main variation for
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[go]$$Wcm16 Main variation for
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$$ | . . . X . . . . . . X . . . O X . . . |
$$ | . . . , X . . . . X . . . . O , X 6 . |
$$ | . . O . . . . X . . . O . . . 3 1 4 . |
$$ | . . . . . . . . . O . . . 9 7 X 2 5 . |
$$ | . . . . . . . . . . . . . . 8 . . . . |
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$$ | . . . , . . . . . , . . . . . , O . . |
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As pwaldron points out, White likes cutting across the keima. Elf has a slight preference for
, but
18 is also good. We'll come back to that variation. OC, Black does not capture the cutting stone in this situation.
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[go]$$Bcm25 Main variation for , continued
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$$ | . . . X . . . . . . X . . . O X . . . |
$$ | . . . , X . . . . X . . . . O , X X . |
$$ | . . O . . . . X . . . O . . . O O X . |
$$ | . . . . . . . . . O . . . O O X X O . |
$$ | . . . . . . . . . . . . . 6 X . . . . |
$$ | . . . . . . . . . . . . . . . 5 . . . |
$$ | . . . . . . . . . . . . . . 7 . . . . |
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$$ | . . 2 . . . . . . . . . . . . . . . . |
$$ | . . . 4 . . . . . . . . . . . . . . . |
$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . O . . . . . . . . . . 3 . . . . |
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approaches the bottom left corner, and White plays a one space pincer. Then Black approaches the bottom right corner and White plays kosumi against
. Next,
and
bolster Black's position in the top right.
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[go]$$Bcm17 Variation for
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$$ | . . . X . . . . . . X . . . O X 3 . . |
$$ | . . . , X . . . . X . . . . O 2 X . . |
$$ | . . O . . . . X . . . O . . . 1 O . . |
$$ | . . . . . . . . . O . . . . . X 4 . . |
$$ | . . . . . . . . . . . . . . . 5 . 0 . |
$$ | . . . . . . . . . . . . . . . . 7 6 . |
$$ | . . . . . . . . . . . . . . . . 8 9 . |
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$$ | . . . , . . . . . , . . . . . , O . . |
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offers stiff resistance, and the play becomes complicated. Black puts pressure on the White stones on the right side.
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[go]$$Bcm27 Variation for , continued
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$$ | . . . . . . . . . . . . . 6 5 7 . . . |
$$ | . . . X . . . . . . X . . . O X X 3 . |
$$ | . . . , X . . . . X . . . . O O X 2 . |
$$ | . . O . . . . X . . . O . 9 . X O 4 . |
$$ | . . . . . . . . . O . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . X 0 O . |
$$ | . . . . . . . . . . . . . . . 8 B O . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . , . 1 . |
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$$ | . . . , . . . . . , . . . . . , O . . |
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White strengthens his stones on the right, which in turn puts pressure on the Black corner. Black bolsters the corner with a hane-and-connect. OC, Black cannot afford to connect to the atari with
, and
captures the
stone.
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[go]$$Bcm37 Variation for , III
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$$ | . . . . . . . . . . . . . O X X . . . |
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$$ | . . . , X . . . . X . . 1 . O O X O . |
$$ | . . O . . . . X . . . O . X . X O O . |
$$ | . . . . . . . . . O . . . 3 . X O . . |
$$ | . . . . . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . 2 . O . O . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . , . X . |
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$$ | . . . . . . . . . . . . . . . . 4 . . |
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$$ | . . 5 . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . O . . . . . . . . . . . . . . . |
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goes after the four White stones on the top side.
plays kikashi, and then
lays claim to the right side. IMO,
is nicely placed.
Now
approaches the bottom left corner.
Elf's second choice
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[go]$$Bcm15 Approach the bottom left corner
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$$ | . . . X . . . . . . X . . . O X . . . |
$$ | . . . , . . . . . X . . . . O , X . . |
$$ | . . O . . . . X . . . O . . . . . . . |
$$ | . . . . . . . . . O . . . . . X . . . |
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$$ | . . . , . . . . . , . . . . . , O . . |
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This approach is probably playable. It got so few rollouts, however, that Elf does not even show White's response. With so few rollouts we cannot be sure of its winrate estimate.
Elf's top choice
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[go]$$Bcm15 One space jump
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$$ | . . . X . . . . . . X a . . O X . . . |
$$ | . . 5 , . 7 . . . X . . 2 . O , X . . |
$$ | . . O 6 . . . X . . . O . . . . . . . |
$$ | . . . . . . . . . O . . . 1 . X . . . |
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$$ | . . 4 . . . . . . . . . . . . . . . . |
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$$ | . . b . . . . . . . . . . . . . . . . |
$$ | . . 3 . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . O . . . . . . . . . 8 . . . . . |
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Elf prefers the jump to
, which strengthens Black in the top right and threatens to cut White in two.
connects the White stones. Elf thinks that the jump attachment at
a is also good. FatKata prefers to enclose the bottom left corner at
b. After
, Black approaches the bottom left corner. White now makes a base in the top left with
, then
plays the kick and
lays claim to the top side, as pwaldron and Uberdude suggest.
Then
encloses the bottom right corner.
Next let's look at the jump attachment for
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[go]$$Wcm16 Jump attachment
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$$ | . . . . . . . . . . . 2 . . . . . . . |
$$ | . . . X . . . . . . X 1 3 . O X . . . |
$$ | . . . , . . . . . X . . . . O , X . . |
$$ | . . O . . . . X . 6 5 O . . . . . . . |
$$ | . . . . . . . . . O 4 . . X . X . . . |
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$$ | . . a . . . . . . . . . . . . . . . . |
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$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . O . . . . . . . . . . . . . . . |
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replies with the 2d line hane.
extends, but enclosing the bottom left corner at
a is also good.
now cuts across Black's keima.
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[go]$$Wcm22 Driving tesuji
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$$ | . . . . . . . . . . . X . . . . . . . |
$$ | . . . X . . . . . . X O O . O X . . . |
$$ | . . . , . . . . . X . . . . O , X . . |
$$ | . . O . . . . X . X O O . . . . 9 . . |
$$ | . . . . . . . . . O X 2 3 X . X . . . |
$$ | . . . . . . . . . . 1 4 5 . . . . . . |
$$ | . . . . . . . . . . . 6 7 . . . . . . |
$$ | . . . . . . . . . . . 8 . . . . . . . |
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$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . O . . . . . . . . . . . . . . . |
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$$ ---------------------------------------[/go]
now initiates a driving tesuji which pushes out into the center. Black is strengthened in the center, but
is a severe cut across the Black keima in the top right.
The one space jump jumped out at me.
And the kosumi in the top left just seemed passive and pedestrian. If it realistically threatened the White approach stone, that would be a different matter.
BTW, after the one space jump I like the jump attachment to induce the 2d line hane with sente, and then enclosing the bottom left corner.