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


This is a copy of the living page "InAKoreanBadukSchool/Attempts" at Sensei's Library.
(OC) 2009 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About