The game is GoGoD 1706-01-08a, a Castle Game between Yasui Senkaku (W) and Honinbo Dochi. Dochi is a future Meijin.
The game continuation:
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[go]$$Wcm10 Pincer
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$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
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$$ | . . . . . . . . . . . . . . . . 5 . . |
$$ | . . . . . . . . . . . . . . . 4 . . . |
$$ | . . a . . . . . . . . . . . . 2 3 . . |
$$ | . . O X X . . . . , . . . . . , O . . |
$$ | . . X . . . O . b 6 . 1 . . X . . . . |
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The pincer,
, loses 13½% to
a, according to Elf. Black presses against the bottom right corner and then invades with
.
figures to be a minor error, losing 7% to
b.
Elf's variation for
follows.
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[go]$$Bcm15 Variation for
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$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
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$$ | . . b . 0 . . . . . . . . . . . . . . |
$$ | . . . 8 . . . . . . . . . . . . O . . |
$$ | . . . 7 6 . . . . . . . . . . X . . . |
$$ | . . 2 9 . 4 c . 5 . . . . . . X O . . |
$$ | . . O X X . . . . d . . . . . , O . . |
$$ | . 3 X . . . O . 1 . . O . . X . . . . |
$$ | . . . a . . . . . . . . . . . . . . . |
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$$ ---------------------------------------[/go]
extends on the left side. The tight pincer allows Black to descend with
instead of playing the more defensive
a. White continues strongly with
and, after Black jumps to
, the kosumi,
, followed by the hane,
.
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[go]$$Bcm25 Variation for , continued
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$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
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$$ | . . . . . . 7 . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . . O 4 3 . . . . . . . . . . O . . |
$$ | . . 5 X O . . 1 . . . . . . . X . . . |
$$ | . . O X . O . . X . . 6 . . . X O . . |
$$ | . . O X X 2 . . . , . . . . . , O . . |
$$ | . X X . . . O . X . . O . . X . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
and
strengthen Black's center stones with sente, then
takes the bottom left corner.
jumps into the center, and the
continues to attack on a large scale, aiming at both White groups.
For
Elf's top choice is no better than Dochi's play, but is instructive.
(After looking again at Dochi's play, Elf slightly prefers it to its own top choice.)
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[go]$$Bcm11 Variation for
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$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
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$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . O X X . . . . 2 . . . . . , O . . |
$$ | . . X . . . O . . . . O . . X . . . . |
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takes the bottom left corner and then
settles the White formation on the bottom side. Black now plays tenuki.
Top choice: Extend towards the left side
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[go]$$Wcm10 Extension
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$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
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$$ | . . 3 . . . . . . . . . . . . . . . . |
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$$ | . . . a . . . . . . . . . . . . . . . |
$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . O X X . . . . , . . . . . , O . . |
$$ | . b X . . . O . . c 4 . . . X . . . . |
$$ | . . . 2 . . . . . . . . . . . . . . . |
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$$ ---------------------------------------[/go]
extends and then
makes eye shape, as we learned at Mother's knee.
a and
b are also joseki, and playable. Then
makes a base and
plays an extension cum pincer.
could also be at
c. Next, White plays tenuki.
By comparison with the variation for
, White gets the extension in both cases, but here White makes a base instead of the pincer, which Black is able to invade and attack.
By comparison with the variation for
, in that case Black gets the corner and White gets the pincer, while in this case Black gets the extension while White makes a base. Black is better on the bottom side, but Black has played one more stone there.
In both options for
the White pincer becomes a liability. Dochi builds strength in the bottom right and then invades White's bottom side. Or Black takes the bottom left corner and White prevents the invasion, but then Black gets to play tenuki.