Malcolm

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Hi!

Welcome to Malcolm Schonfieldís home page on SL. My French rating is 1 kyu FFG ([ext] page on the ffg site). I used to play on KGS with the account: ďmalcolmĒ which is around 1 or 2D. However since 2014 I mainly play turn-based Go and Toroidal Go on littleGolem (littlegolem is the only place I know where you can play Toroidal Go). I learnt Go in 1994 and have been a fan since then! Since 2014, Iíve been [ext] blogging occasionally about Go, partly in English and partly in French. The blog has some commented teaching games at beginner level, and a few posts that may be interesting to more advanced players.

Apart from Go, Iím interested in lots of other things, but I wonít list them all. Still, here are a few: music, languages, ...

Table of contents

1: Tsumego

Hereís a tsumego I was having problems with:

[Diagram]
1: problem  
[Diagram]
1: solution from book  

The solution (from "get strong like a pro") gives black killing white

[Diagram]
1: Mistake  

I was stuck for a long time on finding the correct answer to W2.

B3 is a mistake.

[Diagram]
1: Answer  

unkx80: I think Black should play B3 and B5. See joseki-related life-and-death example 9.

Malcolm: Thanks, the same day you gave me the solution I ended up using Thomas Wolffís GoTools tsumego program to get the answer. I had a blind spot, overlooking the double atari at 'b'.


2: Yose double snap-back

Hereís a yose problem I like with a nice double snap-back:

[Diagram]
2: problem  
[Diagram]
2: solution  

White canít connect with 6 because Black can make a double snap-back (see next diagram). So Black puts 4 stones in atari in sente.

[Diagram]
2: variation (White connects and dies)  


3: A nice tsumego

[Diagram]
3: problem  

A nice tsumego I saw in TrainLikeAPro volume 2

[Diagram]
3: solution 1:  

It took me ages to find this solution. I think I had a blind spot due to the following erroneous reasoning: "after 6 white has two eyes and is therefore alive. There is no need to look any further". Lesson to be learned: two eyes are sometimes not enough! Or: beware of damezumari!

[Diagram]
3: solution 2:  

An alternative. Black 7 at 5, White 8 at 3. After 9 a and b are miai.


This problem is old: it figures in Xuanxuan Qijing where in the version I have itís problem number 4 (of 347 problems...).


4: Tsumego

Hereís a nice tsumego I found in an old volume of the french Go magazine RFG (n¬į 89, 2000), in an article by Pierre Audouard. It took me about 15 minutes this morning to solve!

[Diagram]
4: problem  
[Diagram]
4: Solution  

5: Under the stones tsumego

Hereís an under-the stones tsumego from TrainLikeAPro volume 2. It took me days to realise why "a" is wrong - another damezumari I missed.

[Diagram]
5: problem  

The correct solution starts at "b" :

[Diagram]
5: solution  

B5 at black+square. Result is a direct ko with the first threat to be found by the defender.

[Diagram]
5: mistake  

B5 at black+square.

[Diagram]
5: continuation  

Dead.


6: Unusual tsumego from TrainLikeAPro

31-1-07 : Iím completely stumped by the following problem from TrainLikeAPro, vol. 1, day 2.

[Diagram]
6: Problem diagram  
[Diagram]
6: Solution from book  

Ko.

[Diagram]
6: Stumped  

I do not know how black deals with W4. Looks to me like white lives. so, what am I missing?

[Diagram]
6: unkx80ís suggestion  

unkx80: The first answer that comes to my mind is B5. No, this is not a typo.

[Diagram]
6: Iím still stumped  

I did consider B5. But if W1 in this diagram, what else is there but B2? Then, white lives with W3.

unkx80: This means that I made a reading typo when suggesting B5 in the previous diagram. Right now I see no solution to your W4.

Malcolm: OK. Iíve updated TrainLikeAPro with this analysis. It does seem like an error in the book. Hope you donít mind me using your name. Thanks for the help.


7: Connection

[Diagram]
7: Connection tesuji  

This position comes from a 9 stone handicap game I played recently. In the game, the marked black stones were under attack. But 1 is a nice tesuji to escape. Credit goes to Motoki for pointing it out. 07-04-18

[Diagram]
7: A possible follow-up: ko  
[Diagram]
7: No ko, but Black escapes  
[Diagram]
7: Mistake  

If White plays 4, he lets Black live and loses points on the side: very bad.

[Diagram]
7: Alternate solution  

unkx80: I thought, there might be multiple solutions to this problem. If W2 at W4, then B3 and W2, which reverts to one of your earlier diagrams.

Malcolm: Yes, youíre right. Thanks for the comment.


8: Classical tsumego

The following classical problem is in the Xuanxuan Qijing collection.

[Diagram]
8: Problem  


I have seen a solution which goes as follows:

[Diagram]
8: Solution 1  

After 7 White has to live, and then Black has a tesuji at a which captures the marked stone and makes an eye.


However there seems to be a variation leading to Ko if White plays 4 differently:

[Diagram]
8: Ko  

I wonder if Black can do any better...


Suggestion by flon (no sensei page, sorry): It seems that Black is dead against white 2, setting up an ishi no shita:

[Diagram]
8: white 8: captures the 3 black stones including 1 and 7.  

Flon: I canít find any solution for Black. I checked the Xuanxuan Qijing, but didnít find this problem ;-).
Malcolm, 071212: Thanks Flon. Youíre right, there isnít any solution for Black. I made a mistake copying the problem diagram from Xuanxuan Qijing Problem78. There, White has one less liberty which makes all the difference.

9: Classical tsumego seen in Hikaru No Go

This is also from the Xuanxuan Qijing collection (number 5). And itís in the Gokyo Shumyo: see Gokyo Shumyo, Section 1, Problem 75 / Solution.

[Diagram]
9:Problem diagram  
[Diagram]
9:Solution  

After 7, a-d. 5 is a tesuji that features in one of the Hikaru No Go stories. I got this solution from the sgf file compiled by Jean-Pierre Vesinet (see [ext] u-go.net).


However, in the following variation Black seems to get a ko.

[Diagram]
9:Variation: ko?  

After 9, a through to d seem to give a ko. Am I missing something?
2007-12-14: Iíve found more detail on this variation here.
2008-02-09: Finally reached a conclusion on this problem. More details here. Credit where creditís due: I did get some help from Ang LI 3p...

10: A Fan Hui 5D problem

(2007-08-01). I got this problem from the mailing list of problems by Fan Hui, organised by the FFG (Fťdťration FranÁaise de Go). Itís supposed to be around 5D level.

[Diagram]
10: Problem diagram : Black to play  


After weeks of looking at the problem every now and then and not getting anywhere, I finally found the solution. I havenít looked at Fanís solution. As there are several variations I jotted them down as follows in my handy little Go notebook:

[Diagram]
10: Complete solution  
    d ( e g! ( f a | a f c b )
      | a f ( g e | e g c b )
      | b c ( ( e | f ) g | a f ) )

"|" means "or". "!" means "tesuji".


Itís not easy to read, but it seems to me to be a concise way of writing a non-trivial set of variations.

2007-10-12: This notation now has its own page.


11: Blog about Xuanxuan Qijing

(2007-09-27). I printed out the entire colection from the pdf file [ext] at tsumego.tasuki.org, and Iíve been going through the problems. I now have a new goal: work through all the problems and understand each one. Maybe Iím optimistic, but I reckon it should be do-able (within a couple of years). So far Iíve looked at about 75% of the first hundred odd problems. There are some real gems. There is a [ext] solution file, but it doesnít give many variations. Thatís not necessarily a bad thing, as it means one has to figure things out for oneself. I would recommended it heartily for dan-level players.

At least one of the problems has "Black plays tenuki" as the the correct answer. The solution diagram explains why Black canít do anything locally. Itís an unusual type of problem (Black to play, White lives)...

2007-12-28 : The problem I was talking about with tenuki as the solution: (Xuanxuan Qijing Problem 3).

12: Some of my SL pages

(2007-12-14:) Here are a few pages I started on SL, in no particular order: Lim Yoo Jong, Superpower Go, L'‚me du Go or Four basic shapes, Audouard Coordinates, Pierre Audouard, Center Oriented Players, Concise Problem Notation, History Of Go In France 1965-2007.

(2008-10-04): Xuanxuan Qijing Problem 17 solution The Value Of Two Moves In A Row

(2010-04-22): An alternative method for diagrams and handwritten Go records

13: Coming soon: more on the elephant's jump

(2007-12-28:)I would like to compile some examples of the elephant's jump on SL, from real play. I have in mind a recent game of Lee Sedolís. Also thereís a position from the opening of one of my games Iíd like to look at too. I hope to get that done in january.

14: Lim on a Sedol fuseki

Well, none of the above things got done unfortunately. Now Iíd like to record some of MaÓtre Limís ideas :/Lim on a Sedol fuseki

Links

  • My [ext] Go blog, partly in English and partly in French.
  • Here are some [ext] things unrelated to Go I have on the internet. Take a look at the proverbs (FR, EN), I think theyíre funny. As for the music part, itís only work in progress and Iím not very happy with the recordings Iíve put on it...

Malcolm last edited by Malcolm on April 3, 2015 - 18:34
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