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Hane Tsugi
  Difficulty: Advanced   Keywords: EndGame

JanDeWit: Hane Tsugi is the sequence of moves W1, W3 in the diagram. I see this often in the endgame and when reducing EyeSpace.

[Diagram]
Diag.: Hane Tsugi


(Ignoring the stones at the other end of the Black group.) This is gote for White, unless there is a black stone at one of 'a', 'b' or 'c'. Otherwise Black has to defend against a white play at 'a'. Black can do this in two ways:

  • By playing at 'a'. This is a solid connection and leaves no ko threats.
  • By playing at 'b' or 'c'. This creates more EyePotential ('a' could become an eye), and exerts more influence, but it leaves a ko threat because White can play at 'a' threatening to capture 2. If Black plays 'b', 'd' also is a ko threat.

I'm not sure which of the ko threats is the largest, but I would say that it is White's play at 'd', because White can then start creating some eyes to the right (depending on the local situation of course!)

Taking into account the stones at the other end of the Black group, Black may be able to ignore the White play at 'a', or will have to defend as outlined above.

Given the sitation below, White 'a', would be followed by Black 'd', White 'c', Black 'e', White 'f', and Black connects with 'g'. (The marked Black stone is there only to make it obvious that Black lives regardless of Whites moves and outside liberties.

[Diagram]
Diag.: Hane Tsugi


See also an endgame tesuji that often occurs in this position.



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