InAKoreanBadukSchool/Attempts

Benjamin's solution was quite convincing by the beauty of B1. Seeing might spoil the fun, hence I will moved it to /solutions.


These are illustrations of the thought process of a weaker player (me).

[Diagram]
wrong attempts  

tderz: B1 is wrong.

[Diagram]
wrong attempts  

Illustration of White's Ishinoshita: White will live with 11 points.
The usual shape attacking point black+circle will not work due to the 3 liberties W6 will have after capture (White can reply with white+square).

[Diagram]
wrong attempts - Black's intention  

tderz: Wrong W2:
Because there is no white stone at circle, Black is safe w.r.t. damezumari by horikomi.

[Diagram]
wrong attempts - Black's intention  

The wrongly intended result from Black's view.

[Diagram]
wrong attempts - Black's intention  

White could have previously exchanged W2 for this B3 - still to no avail.
Black takes first with a, white+circle, Black b.


I realize this has already been solved but id like to give it a try with a diffrent solution.

[Diagram]
Black to play  
[Diagram]
 

How about that? -- Intetsu

White plays W2 at the point above B1. After black captures 5 stones, white makes a ko. -- JuhoP


[Diagram]
My solution...  

Black to play...

revo: Thanks a lot for your reports, it's very interesting. I tried a little with your tsumego and I think this B1 solves it.

[Diagram]
Continuation  

If white does not capture with W4, black may have to capture the left part of white. Black must not capture at W4 himself, because white can recapture with the marked stone.

[Diagram]
Continuation - white is dead (a and b miai)  

If black plays B5 at b, W5 makes life.

[Diagram]
Variation 1  

Hwan Kuk Kang: Not bad!

maruseru: I got the same solution as revo. Being 9k (EGF), I thought this was rather easy. So the other tsumego (which you got as tests) were much harder?

[Diagram]
Variation 2: Why is B1 wrong?  

Benjamin: Yes, I think they were much harder - maybe we can show you one from our test next time... By the way, did you understand why this move (B1 in variation 2) is wrong?

maruseru: Because of the continuation shown in these three diagrams, which only leads to ko?

Hmmm... at second thought, maybe this isn't a ko. White takes, and Black connects to the right of 9, leaving White with a false eye. Must think some more.

revo: I think you're right, it is ko. If black connects to the right of 9, white captures black 5 and lives.

[Diagram]
Variation 2, continuation 1  
[Diagram]
Variation 2, continuation 2  
[Diagram]
Variation 2, continuation 3  

This looked like a simpler solution to me:

[Diagram]
Black to play  


A moment's reflection revealed my oversight:

[Diagram]
White lives  


-- TerryMcIntyre, 9k

xela: There's an interesting variation here:

[Diagram]
Black to play  

(What if white doesn't play W4 but goes elsewhere? Then black a and W4, with a similar result.)

[Diagram]
continuation  

B3 captures some stones, but it's not over yet...

[Diagram]
continuation -- ko  

InAKoreanBadukSchool/Attempts last edited by Unkx80 on February 17, 2008 - 15:03
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
RecentChanges
StartingPoints
About
RandomPage
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Goproblems.com
Login / Prefs
Tools
Sensei's Library