Latest postings

The 20 most recent postings on Sensei's Library (not for the faint of heart :o)

 
xela: Has this been used in real tournaments? (2020-02-26 06:44) [#11500]

It's not clear from the page whether SODOR has been used in any major (or other) tournaments, or whether someone has invented it as an interesting concept for discussion.

Uberdude: Re: Is Josekipedia currently defunct? (2020-02-22 17:17) [#11499]

It works for me now.

2600:1700:2ca0:8310: Is Josekipedia currently defunct? (2020-02-22 04:36) [#11498]

I had, after games on KGS, been doing reviews for myself, and looking in Josekipedia for where I deviated in my joseki play. About three weeks ago (early Feb, 2020) the josekipedia site started giving me an error page, with a bunch of techincal info. Is josekipedia now out of action, and if so, will it come back?

Page: Yamada Kimio · Topic: 9x9 Skills
kmr: Re: Reply. (2020-02-15 17:19) [#11497]

To make that bet i would need to know who was stronger in advance. I dont have such a knowledge.

Anyway, it is Sensei Library, not "Free Place To Advertise For Anybody Even If He Is Very Strong Player". If you would explain your method in details (also a bot you claim to say is stronger than AGZ), it could be accepted here. Now it looks like claims of some at least "extravagant freak". You make very strong claims, but you dont back it with any strong proofs or arguments. Sorry, but its not a place for it. Your method and bot might be very good (though when you said your claims is backed by just 1 game make suspicions that your knowledge of scientific method is not sufficient*), but you dont make it in way easy for other ppl to believe you.

  • I could pick very poor game of Cho Hunhyun and claim he was at most weak pro (he played more than 2000 games, at least in few he must have blundered heavily, right?). Cherrypicking never nice. You didnt even said which game of Shusaku you analyzed. I dont know your method much, but i have strong suspicious that if you would choose Shusaku first Castle Game against Sakaguchi Sentoku ([ext] http://ps.waltheri.net/database/game/17242/), you would get Shusaku stronger than from game you chose.
Page: Yamada Kimio · Topic: 9x9 Skills
110.169.43.191: Reply. (2020-02-15 17:02) [#11496]

Monteo I don’t want to talk much. You can send me two game records from a downloadable Go database with hidden player names and ranks, I can figure out who is the stronger player between Black in game 1 and Black in game 2, without prior knowledge of their strength except their moves. If I tell you correctly, you must give me $30 at least (although actually I should charge $500) for wasting my time.

Page: Yamada Kimio · Topic: 9x9 Skills
kmr: ((no subject)) (2020-02-15 13:25) [#11495]

Firm conclusion, really? I dont want to sound agressive, but did you studied experience of similar project (trying to asses strenght of chess players through history using super strong chess AI (rybka 3.x) ?). It looks like no. From the data and analysis, it was drawed conclusion that strongest players were Fisher(strongest 1 year period) and Capablanca (strongest periods from 2 year to 15 year). But actually best played game was by Tal (yeah, i am looking and pointing at your conclusion that Cho Hunhyeon was little stronger than Shusaku). Also Alekhine looked worse than Capablanca, yet somehow he managed to win 34 games match against him convincingly (what is probability that better player lose match played to 6 wins? pretty low, even if difference in strenght is small). You dont even say what AI you used (if AGZ is strongest i assume you used AGZ, but somehow its strange to believe that you have access to it). Also Shusaku and KeJie played completely different games. Hard to compare them, and using AI to jugde Shusaku game is even harder. Judging Dosaku is even more harder from obvious reasons.

Page: Yamada Kimio · Topic: 9x9 Skills
110.169.42.74: New Technique (2020-02-14 18:54) [#11494]

Monteo A firm conclusion can be drawn using an advanced method called Superhuman Performance Analysis Technique. I will show the full results in the book “Who is the Strongest Go Player in History?”. This method is somewhat valid because it shows that AlphaGo Zero is the strongest, followed by AlphaGo Master. Ke Jie is stronger than both Honinbo Shusaku and Honinbo Dosaku.

Eizero1: 2019 World Go Championship (2020-02-13 08:53) [#11493]

Should the 2019 World Go Championship be considered a major international title? Unlike the first two editions, there were preliminaries.

Page: Torazu gomoku · Topic: five points
90.195.243.217: five points (2020-02-13 01:50) [#11492]

this is one extra stone than three points without capturing. some this pattern of pairs where the first number is the difference between the number of black stones versus the number of white stones, the second is the ruling, (3,3), (4,5) may lead somewhere.

107.210.159.110: Advanced material (2020-02-11 15:06) [#11491]

Bill: Does the material about unsettled groups and tesuji belong on an introductory page?

24.138.33.227: Can't create account (2020-02-04 14:20) [#11490]

Getting a database error when I try to create an account.

2607:fcc8:620e:c200: looks splendid anyway (2020-02-04 04:22) [#11489]

Good work, quite interesting - on the other hand, since I haven't read carefully enough it's essentially just art to me. Good old SL!

Page: Yamada Kimio · Topic: 9x9 Skills
xela: The claim "Yamada is strongest at 9x9" is actually plausible (2020-02-03 12:58) [#11488]

"You can also invent another tournament and see whether you will reach the same conclusion or not". Personally I don't think a knockout tournament is a good way to decide who's strongest. So I tried something different: see TheWayto9x9/9x9BayesEloRatings. It's indeed possible that Yamada is strongest (amongst pros active up to 2002). Or maybe Cho Chikun or Takemiya or Ma Xiachun is stronger. There's not enough data to reach a firm conclusion.

Page: Yamada Kimio · Topic: 9x9 Skills
2a0b:f4c0:016c:0004: 9x9 Skills (2020-02-03 02:29) [#11487]

Monteo: He is the strongest 9x9 player based on a synthetic tournament (real games organized as a tournament).

Anonymous: What does "real games organized as a tournament" mean?

Monteo: It means a group of actual games of the actual players recorded during the [ext] Yomiuri TV show program. I put them into a tournament format, called 9x9 Grand Slam, to see who is the winner, and he is Yamada Kimio. See TheWayto9x9/9x9GrandSlam for more information.

Anonymous: So you invented a tournament by using games from a non-tournament format (Yomiuri TV's 1987-2002 Mini-Go 1-Game Matches (ミニ碁一番勝負)) whose rules varied over the years and chose the winner based on undisclosed weighting by yourself?

Monteo: That’s right. You can also invent another tournament and see whether you will reach the same conclusion or not, with the limited game records we have had so far. Or, to be more reliable, you can conduct a big data project to identify bad or divine moves in such pro games, to see how strong they are.

2a02:0c7f:6e15:bd00: Recommended Time Settings (2020-01-23 21:04) [#11486]

Hello, Steve(9k): I mainly play casual games with friends and casual club games. I play too slow - we often run out of time and have to finish at a later date - so I want to start using a clock to practice time management and learn to play at a more reasonable pace. I am aware that my next question will attract a lot of personal preference and opinion but I want to ask it all the same. Can anyone suggest suitable time settings for casual / club games? What have people tried themselves? How well did that work? What would be typical time settings for an amateur tournament? Many thanks :)

2607:fea8:12e0:2b5f: Synthetic Oil vs. Mineral Oil (2020-01-18 16:40) [#11485]

I used SCHWINN Bicycle Lube because I was so impatient. Bottle says "Contains non-toxic synthetic oils". It also says "shake well" which I forgot to do.

I always thought there is something about "mineral oil", but according to Wikipedia, both types are derived primarily from petroleum (and sometimes modified vegetable oil). Don't make mistake: "mineral oil" from ZINGER could be made from vegetable oil, and "Baby Oil" could be derived from petroleum. I believe "mineral oil" is mostly "paraffin", so it doesn't smell.

I also have special modified almond oil at home to oil cutting boards, wood dishes, etc.; and for sure it won't rancid; it is modified oil.

And all types of thee oils will smell; will dry too; smell will dissipate over time, and stones will be covered with film from your fingers' oil; etc... so I am not worried about smell.

DudleyMoore: Re: definition of ladder breaker/ "types of LB" section (2020-01-16 11:48) [#11484]

I have to agree with Malcolm, the piece about the types of ladder breakers seems utterly useless to me.

Malcolm: Re: What about a ladder stopper, which is a breaker or closer (maker)? (2020-01-13 11:44) [#11483]

I agree with the idea of giving two definitions.

However, in the suggestion above, definition #2 is much more commonly used, so it should go first. It should also be mentioned that the other definition is not commonly used. So I would like something like this:


Ladder breaker

1) any stone that lies in the path of a ladder or potential ladder, or adjacent to it, that renders the ladder ineffective in capturing the stone or stones caught in the ladder;

2) any stone that lies in the path of a ladder or potential ladder.

The second definition is rarely used.


Maybe a footnote could be added to the last sentence, listing the few authors/works that use this definition.

107.210.159.110: Re: Why I am lukewarm about “maker” (2020-01-12 22:25) [#11482]

Bill: As I use the term, ladder maker is more general than a play that affects a ladder that is already in existence. It can be a move that sets up a ladder. By the same token, a ladder breaker can break a potential ladder.

PJTraill: Why I am lukewarm about “maker” (2020-01-12 19:44) [#11481]

The reason I am lukewarm about “maker” although it forms such a convincing pair with “breaker” is that I feel that the ladder is made by the initial J-shaped atari, and the attacking stone in the path does not make the ladder but rather stops it being broken: it more like a reinforcement. But these are considerations I would readily set aside if the term were generally adopted.


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