5 years ago explo published a series of tsumego problems. I just found them again. If there is enough response I will republish them here. For historical reasons I start with nr 17. Please mention the nr of the problem(s) you are addressing in the subject title.

November 21st
B to move.

17A:Elementary problem

Click Here To Show Diagram Code

[go]$$B
$$ ------------
$$|....XO..
$$|..XXXO..
$$|.OXOO.O.
$$|OXXO....
$$|.OOO....
$$|........[/go]

17B:Intermediate problem

Click Here To Show Diagram Code

[go]$$B
$$ ------------
$$|........
$$|.XXXO.O.
$$|.XOOO...
$$|.XO,....
$$|.OO.....
$$|........
$$|.O......
$$|........[/go]

17C:Advanced problem

Click Here To Show Diagram Code

[go]$$B
$$ ------------
$$|.O..O........
$$|XOOO...O..X..
$$|.XXX..OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

17B applied in "joseki" (I almost resigned in shame with that dango):

Is it possible you transposed elementary and intermediate?

LOL

17C

I think...

I don't understand thread, but thank-you for posting tsumego problems : )

I would like to see tsumego forum here where people can post and solve problems all day.

@jts : quite possible. The elementary one took me a few seconds; more than the intermediate. But I only copied them ( without permission ) from explo's previous threads in Godiscussions.
@uberdude: I imagined you were blond. Probably because of the "uber".
@logan: don't try to understand. I take care of the problems, everyone else ( except Sverre ) of the solutions.

For 17C I would try the following...


...or the other way round:


W seems pretty dead in both variations, please correct me if I'm mistaken.

Edit: I am obviously hallucinating in both lines, so never mind...

What's that supposed to mean?




17A:Elementary problem



17B:Intermediate problem



17C:Advanced problem

Sverre, your solution to the elementary one is wrong.

Wrong as in dead or wrong as in inefficient?

Wrong as in inefficient: living with 4 points in sente (well, maybe white doesn't connect but then you have a 7 pt gote yose for later) is unconditionally better than living with 3 points in gote.

Well, you were the master solver 5 years ago, so you are discharged now. But OC you are most welcome to participate. I remember you solved most problems by at a18.

What if at 7 in sverre's diagram?

solution: (?)

Tommie in GoDiscussions five years years ago: "This problem is a tough cookie". This turned out to be one of the unsolved problems.
He finally proposed the first move at 8 in sverre's diagram ( ie g19 ) but had no time to explore a final solution. So let me have a try in the attached sgf. I especially like the main variant. Wasn't it Einstein who said that an elegant theory must have some truth in it? ( answer: no !)

Is that mutual life better than my variation? Or did I miss something in mine?

EDIT: Never mind, your refutation to Sverre's is a refutation to mine too ... a fun problem indeed!

Ouch.

I am going to have to set these things up on a real board in the future, aren't I?

Looking over the sgf, I believe I may have found a way for Black to kill, by varying a move from the mainline variation. I may be hallucinating, as usual.



What did I miss this time?

Day #18
November 22th --- Black to move --- ( as always )

Elementary problem

Click Here To Show Diagram Code

[go]$$Bc
$$---------
$$|....OX..
$$|.OOOOX..
$$|OXOXX.X.
$$|.XX,....
$$|.X.X....
$$|........[/go]

Intermediate problem

Click Here To Show Diagram Code

[go]$$Bc
$$---------
$$|....X...
$$|.OOOOXX.
$$|.OXXX...
$$|.OX,....
$$|.XX.....
$$|........
$$|.X......
$$|........[/go]

Advanced problem

Click Here To Show Diagram Code

[go]$$Bc
$$--------
$$|...X.X..
$$|.XOXXXO.
$$|...OOOO.
$$|.O.O....
$$|........[/go]