I'm about to make a second purchase to YesAsia, and I'm thinking about buying these two books (since they are "related" to a book I liked: http://www.yesasia.com/global/ishi-no-r ... /info.html a very good book indeed...). But I'm not sure what these books are exactly, since I don't read Japanese I would only get them if they were problem books for sure:

The title of this one is very cryptic, but the number in the cover seems to imply a problem book: http://www.yesasia.com/global/suji-no-z ... /info.html

And this one is not better: http://www.yesasia.com/global/hitome-de ... /info.html

Could some japanese-understanding person help me :/?

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Geek of all trades, master of none: the motto for my blog mostlymaths.net

The're going to be fairly similar. The first is understanding whether a suji is good play or bad play. The second is a book about good and bad suji. From a title perspective, they're similar to the "Tesuji and Anti-suji" by Sakata which you can get in English. There are likely to be more problems as well in these. I have some of the "Hito me" line of books and they focus on generally pretty simple examples and problems.

Thanks Oren! Then I guess I'll leave them out of my order, since I already have Sakata's book to work on.

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Geek of all trades, master of none: the motto for my blog mostlymaths.net

The first one is something like

"270 trainings of good and bad Suji"

The book has 120 problems on Tesuji, 75 on Endgame, and 75 on Life-and-Death / Semeai.
The solution diagrams include one for some obvious, but incorrect move and two diagrams for the correct sequence.


The second one is of the same type

The title includes something like "get to know on first sight", and again "real Suji" and "fake Suji".

This book has 90 problems for each of the sections mentioned above for the first book.

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The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)

Thanks Cassandra! Maybe then the first can be interesting enough to give it a shot, it's "only" something like 15€, a good €/problem ratio

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Geek of all trades, master of none: the motto for my blog mostlymaths.net