The last one ok if you really want to save the corner, but it’s pretty expensive on the outside…
Sacrificing two Black stones as an exchange for connecting two strings of Black stones that subsequently live, doesn’t seem expensive to me.
White to play.
Black to play.
Where would White love to play if it was their turn?
Looks hard, but isn’t so difficult after all.
Scure a base, sacrifice a stone and win the semeai (capturing race).
Black to play.
A puzzle of @Starline,from his collection L&D Problems (definitely a collection for strong SDK and dans).
Black to begin.
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But you finish half burried… Well ok
“secure a base” Not really, just grab some liberties.
The last is not that difficult to read because they are not so many ways to try to live, but the result is hard to understand when you just have it in the head, not on a board…
I have hints and automatic white moves. Don’t you?
And so do I 
Black to play.
White to move.
Black plays.
Hint: self atari is not always a stupid idea.
This is a puzzle from the Kanzufu collection which I submitted to OGS Puzzles some months ago.
If you are interested in more Kanzufu-puzzles, visit @vougalar’s Guan Zi Pu Collection Volume I: Play Go at online-go.com! | OGS
(Guan Zi Pu’s Japanese name is Kanzufu and in Korean it is called Gwan Ja Bo.)
White to start.
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For the anecdote, guanzipu has been the subject of 2 more books by pro players (one is Rui Naiwei) which give more stuff for the answers.
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And what are your New Years’ resolutions?
Doing a lot of tsumego’s?
Good, you have come to the right place.
Black to play.
Black to play.
Black to play.
White to play.
Black to play.
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White to play.
Black to play.
Black to play.
Black to play.
White to play.
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In OGS’ Puzzle section it is unfortunately not possible to search on the tag of the author of a puzzle collection.
As an extra service to the visitors of this tsumego topic: today I added [Atorrante] to all of my puzzle collections. So if you search for Atorrante you will get all the puzzles collections I entered into OGS Puzzles on display.
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This puzzle is for @Lys, because he started an interesting topic:
Only three moves, two rather normal, but the third one is … a bit crazy 
Black to play.
By the way, this collection is going viral in the OGS Puzzles section.
Black to play. You can’t save them all, but most can be saved.
White to play.
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This is cruel!
I spent about an hour trying to save black without looking at solutions!!! 
I tried that even on the board!!!
I was super motivated to solve it by myself!!!
And failed. 
Just because I was looking for the wrong outcome…
Out of curiosity: does Dutch go magazine rate these puzzles? Hard/medium/easy or something?
Sorry, no ratings.
Now I read yesterday that someone wrote “I’m not talking about Utaro Hashimoto or some crazy stuff like that.” Amost flagged that post!
I think some more Hashimoto is good for you.
And not much crazy things in here.
Connection is the name of the game.
White to play.
Black to play.
Black to play.
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I’m blushing for all your attentions. 
Would you please check the second puzzle?
I think I found a solution but it isn’t the expected one, which in turn appears incomplete to me: it ends with a white move and leaves a cut available if black doesn’t spend another move.
The problem I have with Utaro Hashimoto is that sometimes the puzzle is so puzzling that I look at the solution and still don’t understand what’s happening. 
This one for example:
I watched at the solution and asked myself: “Now what? Is it a ko? Is it a snapback? How does the story end?” 
Black can start a ko by playing A13, but after White B13 the four White stones can be captured (no ko threat). The three Black stones (around A16) subsequently are also dead (but could in theory be snap backed with White B15.
Black can keep alive what is left.
So it is a (useless) ko, (an unnecessary) snapback and Black lives but loses a lot of points.
Conclusion: good result for White.
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Not sure which second one you mean.
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This one:
Do you mean four Black stones?
I checked it. Both set up and solution are identical to what is in the book.
It is not impossible that there is another correct solution.
Always have the impression that Hashimoto goes for the most elegant solution (but don’t ask me to define elegant in this context)