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Opening problems for AI: Problem 17 http://www.lifein19x19.com/viewtopic.php?f=15&t=17607 |
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Author: | Bill Spight [ Thu Jul 02, 2020 7:43 am ] |
Post subject: | Opening problems for AI: Problem 17 |
Today's problem comes frome GoGoD 1921-07-05a, between Segoe Kensaku (W) and Karigane Junichi, both 6 dan. Elf reckons that lost 22% in winrate, assuming 7½% komi. OC, this was a no komi game. Both the human play and the AI choice are textbook plays.
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Author: | Bill Spight [ Thu Jul 02, 2020 9:33 am ] |
Post subject: | Re: Opening problems for AI: Problem 17 |
stands and descends. Elf does not like either one, docking 11½% and another 18½% to par.
makes a base for White in the top right and then makes a one space extension to secure the neighboring Black group on the top side. The stands in the bottom left, and after White jumps to securing White on the bottom side.
The slide, , undercuts the White group and secures the Black group. It is an important play for both groups. responds with the jump attachment to the 3-3 in the corner.
strengthens Black in the bottom left corner with sente. Then cuts White in two in the top right, and White makes life in the corner. If the slide is so important, perhaps Black might have played it before. Indeed, that is the case.
In the game Black played at a, but Elf prefers the slide, albeit by only 2%. |
Author: | Uberdude [ Thu Jul 02, 2020 10:42 am ] |
Post subject: | Re: Opening problems for AI: Problem 16 |
This seems like the kind of position where marking the last move (and being the players knowing it) can lead you astray:
Given the big gap from e3 to k3 and that c10 is low, I'm going to say white c2 is not a severe attack so top is more important. If white defends at g4 then is a good time for black to take the corner. |
Author: | Bill Spight [ Thu Jul 02, 2020 11:08 am ] |
Post subject: | Re: Opening problems for AI: Problem 17 |
Sorry, Uberdude. I didn't notice my typo. For the last diagram I wrote when I meant . Here is the relevant game sequence.
Elf prefers a to each of and , to by 2%, to by 10½%. |
Author: | dhu163 [ Fri Jun 04, 2021 10:22 am ] |
Post subject: | Re: Opening problems for AI: Problem 17 |
Speculatively: Current position: 1. I only see either M17 or N18. N18 seems more normal shape but in this case I'm not sure. A B move at Q12 will be urgent soon. 2. P9 may eventually be big 3. C13 is nice. 4. D2 is big, but seems submissive when there is such a big gap from C3 to K3. Opp to play 1. M17 is obvious. to settle W's weak group and weak shape, leaving big follow ups at F17 and R18/R11 2. O5 is very nice. 3. C2 is a big point with some attack 4. F5 builds the lower side. Past: 1. Seems balanced. On upper side, B's two space seems overconcentrated, but B has sente to attack W's shape, so perhaps I actually like B overall. Still, W's wide extension at E3 to K3 seems hard to punish. Check: 1. close enough |
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