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The 1986 Honinbo
Posted: Tue Dec 12, 2023 5:44 am
by Knotwilg
I'm studying games by Takemiya with AI. The goal is to figure out how his influential style actually worked and how KataGo would deal with the moyos that often occurred in his games. I took the 1986 Honinbo title match against Yamashiro Hiroshi. Incidentally, there's some discussion on the dates. My sgf source says 1986 but a Sensei deshi found game 1 in Takemiya's book Cosmic Go where it was labeled 1985.
So far I completed two reviews. White won on both occasions. Going forward, Takemiya will win the next three games, making it 4-1 for him (and for White
).
https://senseis.xmp.net/?Honibo1986Titl ... viewWithAI
https://senseis.xmp.net/?Honibo1986Titl ... viewWithAI
Re: The 1986 Honinbo
Posted: Tue Dec 12, 2023 5:56 am
by Knotwilg
Some situations:
$$Bm21 Moves 21 to 30
Click Here To Show Diagram Code [go]$$Bm21 Moves 21 to 30
Would you answer locally? If so, A, B or C?
Or tenuki? If so, D, E or F?
Takemiya and KataGo made a different choice.
Re: The 1986 Honinbo
Posted: Tue Dec 12, 2023 6:00 am
by Knotwilg
$$Bm51 Moves 51 to 60
Click Here To Show Diagram Code [go]$$Bm51 Moves 51 to 60
Would you play "honte" at A? Or deal with the top on a broader level? Or tenuki?
Re: The 1986 Honinbo
Posted: Tue Dec 12, 2023 11:26 am
by Knotwilg
$$Bm11 Moves 11 to 20
Click Here To Show Diagram Code [go]$$Bm11 Moves 11 to 20
White has created strength in the upper left. Where would you play?
Re: The 1986 Honinbo
Posted: Tue Dec 12, 2023 12:40 pm
by jlt
$$Bcm11 Moves 11 to 20
Click Here To Show Diagram Code [go]$$Bcm11 Moves 11 to 20
I really want to play c which helps M16 escape towards the center and is at the border of White's moyo.
* a feels too close to Black's strong corner;
* b induces f, which helps White make a good shape and removes Black's possibility to play g;
* d makes territory but induces White e and weakens M16.
Re: The 1986 Honinbo
Posted: Tue Dec 12, 2023 4:51 pm
by pwaldron
Nice positions, and thank you for the post.
Knotwilg wrote:
$$Bm21 Moves 21 to 30
Click Here To Show Diagram Code [go]$$Bm21 Moves 21 to 30
For me it's a tossup between 'd' and 'f'. My eye is drawn to 'f' to work well with 23, but I know in the age of AI the territory often wins. 'd' has the advantage that it attacks white's base in the corner.
Knotwilg wrote: $$Bm51 Moves 51 to 60
Click Here To Show Diagram Code [go]$$Bm51 Moves 51 to 60
In a game I would play 'a' without thinking. Maybe Takemiya has a grand plan, but I certainly don't.
Knotwilg wrote: $$Bm11 Moves 11 to 20
Click Here To Show Diagram Code [go]$$Bm11 Moves 11 to 20
Of the choices given ('a'-'d') I'd take 'd', but I think 'e' moves in the same direction but grabs a bigger corner. Combined with 'b' and a light reduction from the centre leaves White without a lot of points.
Re: The 1986 Honinbo
Posted: Wed Dec 13, 2023 2:34 am
by Knotwilg
$$Bm11 Moves 11 to 20
Click Here To Show Diagram Code [go]$$Bm11 Moves 11 to 20
For much of the game, AI wants to play B. My interpretation: it makes territory, it reduces potential territory, it keeps sente, and if White plays there, there's aji in the corner. As pwaldron pointed out, the move improves White's shape too, but probably the lone stone in the moyo can be treated lightly if the moyo is reduced.
Takemiya's opponent played C.
).