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Opening problems for AI: Problem 11 http://www.lifein19x19.com/viewtopic.php?f=15&t=17585 |
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Author: | Bill Spight [ Mon Jun 22, 2020 8:57 pm ] |
Post subject: | Opening problems for AI: Problem 11 |
Another game between Takagawa (W) and Sakata, GoGoD 1954-09-08a.
Takagawa made a textbook play, but Elf reckons that it loses 16% to par. |
Author: | Bill Spight [ Mon Jun 22, 2020 9:00 pm ] |
Post subject: | Re: Opening problems for AI: Problem 11 |
No surprise, Boshi no Takagawa played a boshi on the left side.
secured the top left corner, and then attaches against to invade the left side.
After the kick, , and , bolsters the Black group in the top right and aims at the pincer, . starts an attack against the Black group. plays on the frontier of the incipient moyos, expanding the Black moyo and limiting the expansion of the White moyo. With sente, nonetheless.
attacks the Black group. If , White switches to the top left corner with p
In the mainline variation plays the kick in the top left, then White presses the attack against the Black group. As a result White builds a moyo into the center. Elf regards this attack as more urgent than the boshi on the left side. Elf regarded the top right as urgent earlier. Sakata played at a in the next diagram, but Elf recommends making a wall on the right.
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Author: | dhu163 [ Fri Jun 04, 2021 10:06 am ] |
Post subject: | Re: Opening problems for AI: Problem 11 |
Speculatively: Current position: 1. Right side seems hot, but I can't see a good move for W to defend. P12 might be slack. P6 too will lose territory when later B R7. 2. C17 seems natural to settle. 3. E15, E5 very natural but as B has support, B can fight back with E3/E17. Hence, its tempting to probe around E12 first. D10 is shapey later but I don't see any weak B group to fight against. Still E15/E5 very natural anyway. On the other hand W can't easily make a big area on upper side or lower side as B has groups on the edges of it (in all 4 corners) and W can only thinly shut them off. 4. W might have a moyo on the lower side, but this seems to require P6 first. 5. O16 shapey, but too damaging to right side. 6. P2 a move sometimes, hard to judge. 7. Overall I am tempted by P6 with E15 second. Opp to play 1. E17 E16 H17 attack. 2. O4 get out, cut off weak group 3. N15 defend weak group, reduce top. Past: 1. Seems pretty balanced, B's shape on left is ok, B has advantage in 3 corners, but the S16 S17 exchange is terrible. Check: 1. I missed the key point at P13, probably due to not daring to play such a tight move. |
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