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

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

wrong attempts

tderz: is wrong.

wrong attempts

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

wrong attempts - Black's intention

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

wrong attempts - Black's intention

The wrongly intended result from Black's view.

wrong attempts - Black's intention

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

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

Black to play

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

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 solves it.

Continuation

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

Continuation - white is dead (a and b miai)

If black plays at b, makes life.

Variation 1

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?

Variation 2: Why is 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 ( 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.

Variation 2, continuation 1
Variation 2, continuation 2
Variation 2, continuation 3

This looked like a simpler solution to me:

Black to play

A moment's reflection revealed my oversight:

White lives

-- TerryMcIntyre, 9k

xela: There's an interesting variation here:

Black to play

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

continuation

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

continuation -- ko

InAKoreanBadukSchool/Attempts last edited by Unkx80 on February 17, 2008 - 15:03