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 Post subject: Re: LeelaZero adventures on Fox
Post #101 Posted: Fri Feb 22, 2019 8:32 pm 
Honinbo

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Here's why I think so.

White 314 loses 6% ????? Well, Black is considered to be ahead at this point, so that may just be the win rate approaching 100%. But that underscores the problem of using consecutive win rate estimates to indicate mistakes.

White 310 loses more than 3% ????? Here there is no excuse that Black is ahead. even after White 310 Black is estimated to be ahead.

White 302 gains 1/3 pt. (I am using territory scoring.) Is this a mistake at area scoring? Possibly, depending upon the ko fight. At territory scoring canonical play is for White to take the 1/2 pt. ambiguous sente on the top (White 304) and then take the 1/2 pt. gote at 303. Then Black can take the ko at 302, but White has a local ko threat. (Edit: I have looked at the ko fight. Black is komaster, but I don't think he has enough ko threats to make White filling the ko superior.)

Black 301 gains 1/2 pt. It is miai with 303, but worse for ko threats. Canonical play is at 304, ambiguous 1/2 pt. reverse sente.

White 300 gains 1/2 pt. Again, canonical play is at 304.

White 298 gains 2/3 pt. (ambiguous reverse sente). Canonical play is at 299, gaining 3/4 pt.

White 294 (saving 2 stones) loses more than 1%, with White ahead?

Black 267 gains 3%????? With White ahead? Surely that indicates a previous misestimation.

White 256 loses 6%????? Even versus the variation? Really?

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 Post subject: Re: LeelaZero adventures on Fox
Post #102 Posted: Wed Mar 27, 2019 1:42 am 
Judan

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LZ has improved (in self-play Leelo at least) quite rapidly in the last few weeks, here's a game (LZ black) with 214. Opponent held his own fairly respectably until he died in the wrong way at top right (because he didn't make miai of saving the dead group or doing mean things to bottom right corner). A fun ko at top left, with him making nice use of the technique of playing out lower side to create some large ko threats, with LZ's decision to end the ko because it knew it could sacrifice the lower stones in an effective way to build some centre points was impressive (answer threat was not bad, but just something like 96 instead of 97%).



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 Post subject: Re: LeelaZero adventures on Fox
Post #103 Posted: Sun Apr 28, 2019 4:15 pm 
Judan

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A game with latest netwoek #223. Not sure if the opponent was a bot, he always used 25 seconds per move for a while and only lost advantage slowly, but then messed up a fight and didn't resign for ages. I thought LZ's judgement of when to play solidly to settle, when to sacrifice, when to play severely was interesting. LZ's winrate slowly grew until he messed up a fight and game over. Highlights:
- move 26 white should have d9 sente first to stop black making some eyespace there.
- 41: LZ wanted r7 extend but lighter r8 was a promising blue circle, I played out a few moves and winrate stayed higher so I picked it.
- 48 was mistake, should n4 or l7 and make a mess. So why didn't LZ want to atari there before j4? And why did it want to atari there now rather than directly l7 (-1%). I wonder if something to do with white j2 in a sequence wanting to be gote. Or is it just if black makes the territory it's double sente yose?
- 65 don't often see LZ make this block, but quick life and makes r11 wrong
- 69 cut was preferred to (natural to me) o16 (-7%) getting out even though it then didn't run with it and just went back to living in corner. I think the option of q12 atari to help reduce a w moyo and make w bad shape was why.
- 76 o16 slow, should f17
- 77 interesting that LZ picked this way to attack, it is mutual base of 2 unsettled groups but struck me as slow compared to top side (e.g. g17 -3%). But it judges strength and weakness of groups here as urgent and doesn't mind if white extends on top, because by attacking this group we can expect to keep top under control
- 81 voila, black d9 group is now essentially alive whilst white group weak and only now does black play top side in good rhythm.
- 83 another lesson, attack from 2nd line not centre!
- 95 W should answer this peep in centre and black is 65% (see sgf var - it's in a way that means if black cuts white group has exit route and black has ugly shape. e18 was an invasion point but he got timing wrong. Now he starts making big mistakes, maybe his bot crashed.

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 Post subject: Re: LeelaZero adventures on Fox
Post #104 Posted: Sun Jun 16, 2019 4:07 am 
Judan

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Down to 8d, many bots at 9d on Fox. This was clearly against a human 8d, a beautifully clear example of the LZ strategy of taking territory, give walls, make a live group inside the moyo and 99% by move 80. Of course the 8d opponent helped with his slight mistakes, but still impressive. The paratrooper of move 50, kind of on the sector line aiming at p11 or q11 for sabaki was a highlight.



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 Post subject: Re: LeelaZero adventures on Fox
Post #105 Posted: Sat Jun 22, 2019 12:28 am 
Judan

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LZ 229 (black) using a ko threat factory (main branch):



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 Post subject: Re: LeelaZero adventures on Fox
Post #106 Posted: Mon Jun 24, 2019 2:04 am 
Dies in gote

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Uberdude wrote:
Down to 8d, many bots at 9d on Fox. This was clearly against a human 8d, a beautifully clear example of the LZ strategy of taking territory, give walls, make a live group inside the moyo and 99% by move 80. Of course the 8d opponent helped with his slight mistakes, but still impressive. The paratrooper of move 50, kind of on the sector line aiming at p11 or q11 for sabaki was a highlight.


"slight mistakes"?

He lost 13% at move 19 because of joseki fail, lol

then he appeared to lose fewer points, but actually it's because his score was so close to zero there was nothing much to lose. In isolation his other joseki mistake would lose 8%


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 Post subject: Re: LeelaZero adventures on Fox
Post #107 Posted: Mon Jun 24, 2019 3:56 am 
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Where should B play with 19?

The move chosen is very natural - I suspect a very large number of humans would select it.

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 Post subject: Re: LeelaZero adventures on Fox
Post #108 Posted: Mon Jun 24, 2019 4:04 am 
Lives in gote

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:study: My LZ want the solid connection at E13

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 Post subject: Re: LeelaZero adventures on Fox
Post #109 Posted: Mon Jun 24, 2019 4:49 am 
Judan

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LZ views the outside atari of 15 as -2% mistake and prefers the connection which some might find ugly as it causes a previous stone to become an empty triangle. I seem to recall that outside atari and squeeze being recommended in a joseki book which said connect was bad (probably Japanese). I expect LZ not liking the wall following hanging connection is not only the general tendency of strong bots to value centre walls as less valuable than prior humans, but a lot to do with the easy-to-play g14 peep (see also http://josekipedia.com/#path:pdqfncrdqhqcqerepfqgpgoe for a less obvious peep that changed value of wall and justified prior ugly playing into hane-at-head-of-two bad shape). LZ prefers e13 solid connection because then when white cuts at c13 black can atari at c12 and after white capture can tenuki because d12 is not atari. The g14 peep / f14 cut is still a significant weakness though so the wall is not really thickness and can even become a weak group.

And yes the n2 double hane is normally a bad move and n4 too is slack territorially, but it's the kind of move I can well imagine a Japanese top pro from the last century playing as part of a consistent moyo strategy. The reason it's so bad with the L3 counter is not a new AI move but one lesson I've reinforced from AI study. I did think it was odd he played n3 though and didn't even get s3: maybe he feared tenuki? LZ would have answered.

And worth bearing in mind top pros of today losing 8% (in LZ 229 opinion) a move is not unusual.

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 Post subject: Re: LeelaZero adventures on Fox
Post #110 Posted: Mon Jun 24, 2019 12:33 pm 
Honinbo

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Tryss wrote:
:study: My LZ want the solid connection at E13


Me, too. :D

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 Post subject: Re: LeelaZero adventures on Fox
Post #111 Posted: Mon Jun 24, 2019 12:57 pm 
Honinbo

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Uberdude wrote:
LZ views the outside atari of 15 as -2% mistake and prefers the connection which some might find ugly as it causes a previous stone to become an empty triangle. I seem to recall that outside atari and squeeze being recommended in a joseki book which said connect was bad (probably Japanese).


That seems strange to me. If you don't like the empty triangel here, don't make the hanging connection in the first place.

Quote:
I expect LZ not liking the wall following hanging connection is not only the general tendency of strong bots to value centre walls as less valuable than prior humans, but a lot to do with the easy-to-play g14 peep (see also http://josekipedia.com/#path:pdqfncrdqhqcqerepfqgpgoe for a less obvious peep that changed value of wall and justified prior ugly playing into hane-at-head-of-two bad shape). LZ prefers e13 solid connection because then when white cuts at c13 black can atari at c12 and after white capture can tenuki because d12 is not atari. The g14 peep / f14 cut is still a significant weakness though so the wall is not really thickness and can even become a weak group.


When I was a kyu player I read something (by Sakata, I think) about this double peep connection, to the effect that answering one peep was OK, but then answering the second peep was not so good. That is not so easy to imagine when the peeps are on the 5th and 6th lines. And, as you point out, the ability to atari White C-13 looks big. As for the wall not really being thickness, that doesn't seem to bother the bots. ;)

Quote:
And worth bearing in mind top pros of today losing 8% (in LZ 229 opinion) a move is not unusual.


Also worth noting that the margin of error of the winrate estimates actually increases with the strength of the bots, not because they make more errors, but because the swings increase. With a bot that plays perfectly, the swings are 100%. :lol: For Leela 11 I reckon that plays that lose less than 3% are probably not errors. For Elf 1 I think the figure is higher, maybe 5%. Nobody really knows, because the research on margins of error has not been done.

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