Showing posts tagged: tsumego


Sunday Problem #53

This is an original problem based on a shape that appeared in the yosai v. nussbrot league game.

Technically, this should be called an endgame problem.

Black to play.

Solution
Failure (1)
If Black simply captures one stone with 1, White forces 2–3 in sente, then lives in the corner with 4–6.
Failure (2)
Sometimes, an attachment such as …

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Sunday Problem #52

Celebrating one year of Sunday Problems!

This problem is from Kōno Rin 9p’s Twitter.

Black to play.

Solution
Solution (1)
If White gets to play at 1, no combination of two black moves can kill his group, and so we can quickly figure out that black 1 is the only possible starting move.
If White challenges Black with 2, …

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Sunday Problem #51

This is technically an original problem by me, inspired by the recent ngd league game between Sandmann and le_4TC. However, the shape quickly develops into something that also exists in classical tsumego collections.

Black to play.

Hint

Try to avoid kō.

Solution
Failure
Black’s block of 1 is obvious, and so the question is what to do after white …

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Sunday Problem #50

This is a variant of the infamous carpenter’s square that comes up from time to time in games.

This is a problem for high dan amateur players, so for everybody else I have added a small spoiler that tells the end status of the problem, without actually showing any moves.

Black to play.

Spoiler

Black can kill unconditionally.

Solution
Failure …

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Sunday Problem #49

This is an original problem by me, based on a shape that occurred in a league game between Soeren and Lebertran. Subscribers of the 2021 April league can view the game here.

Black to play.

Solution
The problem
This problem is mainly about how to turn ‘a’ and ‘b’ into two eyes for Black. Normally, both of they …

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Sunday Problem #48

Like Problem #12, this is from the Collection of Tsumego Masterpieces by Sekiyamas Riichi, Toshio, and Toshimichi. This time, Black has to try to make life in a very cramped corner setting.

Black to play.

Solution
Failure (1)
Black’s connection of 1 creates a challenging subproblem, but ultimately it is wrong. White’s sharp attack of 2–10 kills Black unconditionally. …

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Sunday Problem #47

It looks like this white corner group is difficult to capture unconditionally, but there is a surprisingly clean sequence hiding in plain sight.

Black to play.

Solution
Failure (1)
Simply turning with black 1 is not enough. White claims the key point of 2, and then for example black 3 and 5 get refuted by White’s 4 and 6. White …

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Sunday Problem #46

Like last week’s problem, this is also a classic tesuji problem.

Black to play.

Solution
Solution (1)
Black does not have much choice but to start with 1, but in response to this White launches the attachment of 2. After this, the rest of the problem is about how Black can avoid having to fight a kō.
Black’s 3, 5, and 7 are the key tesuji combination. Following, even though White can capture two stones with 8–
Solution (2)
–Black recaptures with 9, and wins the capturing race directly.

Sunday Problem #45

This is a classic tesuji problem. I unfortunately don’t know the origin; my source material is a tsumego printout from a dōjō I used to go to when I was insei.

Black to play.

Solution
Solution
Black’s first-line peep of 1 is correct. To keep attacking, White has to connect with 2, but then 3 ensures Black’s group has four liberties and so she wins the capturing race.

Sunday Problem #44

This problem is from Nihon Ki-In’s 150, or 150 Graded Life-and-Death Problems for 7-Dan Players.

Although this shape is hardly anything that could occur in a real game, personally I like this problem because of its straightforward and yet extremely non-obvious solution.

Black to play.

Solution
Solution (1)
For Black’s first moves, there is nothing else to …

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