Showing posts tagged: sunday-problem


Sunday Problem #68

This is an original problem arranged from a shape that appeared in a recent tournament game by Lukáš.

Black to play.


Sunday Problem #67

This is a classic tesuji problem that appears for example in Lee Chang-ho’s collection of tesuji problems.

Black to play.

Solution
Failure
Simply connecting at 1 does not cut it for Black. White extends his corner group’s liberties with 2, threatening to live with 3; if Black tries to prevent this with 3, then white 4 first captures Black.
Solution …

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Sunday Problem #66

This is a difficult variant of a classic tsumego that showed up in my recent lesson with Oscar.

Black to play.

Solution
Solution (1)
The hane of 1 is one way for the black group to live. If White descends to 2, Black jumps to 3, making a miai of ‘a’ and ‘b’.
Solution (2)
Things get more complicated if …

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Sunday Problem #65

This is an easier classic problem to counterweight the recent difficult problems. While the solution sequence is straightforward, it is however still quite long and makes for good visualisation training.

Black to play.

Solution
Solution (1)
Pretty much the only thing Black can try in this problem is the 1–3 squeeze. Following . . .
Solution (2)
. . . …

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Sunday Problem #64

This gem of a problem is based on a shape from Guanzi Pu.

Black to play.

Solution
Solution (1)
This problem is difficult to solve if you’re not familiar with the tesuji of black 1. This sets up two ways for Black to get the forcing moves necessary to form life in the corner: 2–11 here is the first of …

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Sunday Problem #63

This is a somewhat more challenging problem featuring a shape that could appear in a real game.

Black to play.

Solution
Failure
Black 1 may look like a promising move, but it lets white live with 2. Following, Black can get 3–8 in sente for a fairly good endgame profit, but this is still a failure because the core white …

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Sunday Problem #62

Similarly to Sunday problem #61, this is a classic life-and-death shape.

Black to play.

Solution
Solution
Black 1 is the only move that prevents the three white stones from escaping while also improving Black’s eye shape. After 2–4, Black’s throw-in of 5 and the subsequent oiotoshi squeeze ensure two eyes for her group.

Sunday Problem #61

This is a classic corner problem.

Black to play.

Solution
Solution (1)
The diagonal move of black 1 is a tesuji in this shape. If White resists with 2, Black cuts the white shape with 3–6 and finally wins a local capturing race with 7.
Solution (2)
White’s connection of 2 here is an alternate resistance, but it fails to Black’s 3–7. In both solution diagrams, black 1 is a key point for the local capturing race.

Sunday Problem #60

This problem is based on a shape that appeared in a recent ngd league game between Sanderbaduk and irglbriz; July league subscribers can view the game here.

Black to play.

Solution
The start
Black cannot form two eyes locally, so she has to depend on White’s outer shape problems. 1–2 is a useful preparation, after which black 3 attempts …

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Sunday Problem #59

This is a classic life-and-death problem which most readers are probably familiar with. From an endgame point of view, however, the status of the resulting corner shape is quite interesting and worth thinking about.

Black to play.

‘Solution’
Black’s failure
Most people know the attachment of black 1, here, but the follow-up with 3 and 5 is wrong: White lives …

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