I just downloaded 围棋练习大全, a Chinese tesuji, tsumego, and joseki app. On the positive side, there are a lot of problems -- 320 tesuji and 735x3 elementary-/middle-/upper-level life and death problems. On the negative side, I don't think you can see the solution unless you get it (probably better for training). Any inputs on the below?

Click Here To Show Diagram Code

[go]$$c Black to play. \n Source: 围棋死活练习[初级411/735]
$$ --------------------
$$ . . . . . . . . . . |
$$ . . . O O X O . . . |
$$ . O . O X X . O . . |
$$ , . O X . X , X . . |
$$ . O . X X X . O . . |
$$ . . . X O X O . . . |
$$ . . O . O X O . . . |
$$ . . . . O O O O . . |
$$ . . . . . . X . . . |
$$ , . . . . . , . . . |[/go]

I'm 4d KGS ~ 7d WBaduk, Tygem ~ weak 5d Chinese and the Elementary set is about right for me. I don't know who made the app but they're awesome.

I've extended what I mentioned above as potentially the correct line. I also added Ed's suggested possibilities as variations. I'm not a strong player, so if anyone can see a flaw, please speak up.

And if this problem is really in the "Elementary" section, then I need to go back to just playing tic-tac-toe.

Hi gonut,

Always love a title which says "simple elementary basic introduction to beginner's fundamentals" while the content covers mid to high dan stuff.

I'm not sure if this makes go more accessible, though.

I feel mystified why some people get in such a lather about a virtually non-existent issue.

The original problem collection was devised for a Chinese audience. For all we know it came with a set of textual hints. Each problem possibly was also presented in a graded way built on previous examples. The Chinese title implies these problems are for repetitive practice, so that by the time you repeat them enough they are elementary - that's the idea, surely? After all, many problems only look hard until you know the solution then they seem trivial, as egg-man Columbus reminded us.

As far as this problem set goes it does not appear to claim to be a "How Good Is Your Go?" test. The implied question, a much better one, is "How Good Do You Really Want To Be?"

The original classification on the problem collection's website was "chuji" = "Beginner Dan", "zhongji", and "gaoji" = "High Dan".

No textual hints on the website, just the problems alone. Also no "graded" way for "building on previous problems", as to my experience.

However, as far as the problem in the initial posting is concered, according to my experience with solving Tsume-Go, problems that have a Ko as the correct answer are always assessed to be more difficult (especially when it includes another than a "simple direct" Ko) than problems with unconditional answers.

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

Regarding the original problem, I'm a little concerned that the only path I was allowed to click on resulted in the failure.

As John Fairbairn wrote, it could very well be that the original source of the problems used in the app had more textual aids. As piracy and not citing sources are common practices in China, it's possible the app makers simply omitted hints and/or the answer from the original source. The app maker isn't solely focused on Go and has apps for Xiangqi, backgammon, Freecell, Mahjong, etc.


Adding to Cassandra's post, the "About" section of the app shows:
初级围棋死活练习(适用初学者) -- Chuji Weiqi Sihuo Lianxi (Shiyong Chuxuezhe)
中级围棋死活练习(业三段左右) -- Zhongji Weiqi Sihuo Lianxi (Ye Sanduan Zuoyou)
高级围棋死活练习(业五段以上) -- Gaoji Weiqi Sihuo Lianxi (Ye Wuduan Yishang)

My interpretation of the translation is:
[Elementary] Level Life & Death Practice (Suitable for Beginning Students)
Middle Level Life & Death Practice (Around [Professional] 3dan)
[Upper Level or Advanced] Life & Death Practice ([Professional] 5dan and up)

I'm having a little trouble translating the dan and whether or not it is Professional or Amateur. Professional in Chinese is 专业 (Zhuanye) and sometimes 职业 (Zhiye). Amateur is 业余 (Yeyu). Of course, the only character we're given is 业 (Ye), which could be the abbreviation of either -- hopefully somebody familiar with Chinese Go/Weiqi terms could help us out. My read from this is that Amateur dan ranks are written with Arabic numerals and Professional dan ranks are written in Chinese characters, which would make these Professional dan ranks.

EDIT: Spoiler added to hide possible first move.

I would like to assume that "Dan" is meant as an amateur rank.

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