Showing posts tagged: sunday-problem


Sunday Problem #38

This is an original problem by me, inspired by a shape that occurred in an ngd league game. This is one of the few cases I’ve seen where a real-game position leads to a difficult and interesting life-and-death problem.

This problem included a small competition, where the first person to post the correct answer would get one month of Kifu …

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Sunday Problem #37

This is a classic problem from Gokyō Shumyō. There are in fact two solutions, but they lead to the same final shape.

Black to play.

Solution
Solution (1)
Black can start with 1 or 5 – in either case, White responds with 2. Instead of 3, too, Black can first throw in at 5 without changing the outcome.
After 3, …

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Sunday Problem #36

Continuing with famous classic problems, this is problem 15 from Chō’s tsumego encyclopedia, advanced section.

Black to play.

Solution
Solution
Black’s 1–3 combination is the only order of moves that works. The main challenge in this problem is finding black 3, which becomes a kind of blind spot due to its bad shape.

Sunday Problem #35

Like last week’s problem, this is also from Guanzi Pu – and, in fact, also from Xuanxuan Qijing, where its title is (sui-raku-seki-shutsu). Literally this means a river’s water receding and the riverbed’s rocks’ becoming visible, but the figurative meaning is that of truth becoming revealed.

Black to play.

Solution
Solution
This diagram shows White’s strongest resistance. …

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Sunday Problem #34

This is a slightly modified problem from Guanzi Pu. Although most of Guanzi Pu’s content is endgame (it’s even in the collection’s name, or Endgame diagrams), this is clearly a life-and-death problem.

Black to play.

Solution
Solution (1)
Black has no choice but to start by driving White down to the first line with 1–6. After this, however, …

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Sunday Problem #33

Here is an easier problem a ridiculously difficult endgame problem that somehow found its way to a life-and-death problem collection.

This is from the Nihon Ki-In’s 150, or 150 Graded Life-and-Death Problems for 3-Dan Players.

Black to play.

Solution
Gote seki
The book mistakenly says that the bump of black 1 is correct, followed by white …

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Sunday Problem #32

This is an original problem I thought up two days ago. The shape is closely linked to Sunday Problem #31, but this problem highlights an aspect of the base problem that people more rarely think about.

Black to play.

Solution
Solution (1)
Black 1 is the correct starting move – even though at first glance it appears to make …

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Sunday Problem #31

This problem is from (Hiden Mondaishū, or Secret Problem Collection) by Hon dōjō, whose students include Fujisawa Rina 4p, Ichiriki Ryō 8p, and Shibano Toramaru 9p. The creators of the collection most likely had Igo Hatsuyō-Ron as their model, what with its originally having been a secret of the Inoue school, but having Mynavi openly publish the …

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Sunday Problem #30

Similarly to Sunday Problem #29, this is from the Igo Hatsuyō-Ron.

Black to play.

Solution
Solution
The solution of this problem involves a very rarely seen technique. Black has very limited space in which to form two eyes, and must therefore get crafty.
The moves 1–6 are commonsensical and, while black 7 looks like bad shape, it is also …

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Sunday Problem #29

Since everybody hopefully has a bit more free time at this time of the year, I will briefly continue on the subject of difficult problems.

This problem is from no other than Igo Hatsuyō-Ron, probably the most difficult collection of classic tsumego. In the present day, players aspiring to become professional are the core audience of the book; historically, the …

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