B2 Bomber

   
For the humorous article under this name until 2019-11-18, see The Power of the B2 Bomber

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The B2 Bomber is a name for a heavy lump of 6 stones, a dango. The name alludes to the shape of the [ext] Northrop Grumman B-2 Spirit bomber.

Table of contents Table of diagrams
!B2 Bomber
Probe and mistaken continuation
Probe: continuation to !B2 Bomber
Classic joseki
Go Seigen variant, 110
Go Seigen variant, 1116

[Diagram]
B2 Bomber  

http://upload.wikimedia.org/wikipedia/commons/thumb/b/be/USAF_B-2_Spirit.jpg/200px-USAF_B-2_Spirit.jpg?alignleft.jpg


Bad probe of a shimari

One way it can arise is from peeps at a trumpet connection (double tiger's mouth), as in this failed attempt to create sabaki with a probe at a shimari:

[Diagram]
Probe and mistaken continuation  

W9 should have been further out at a[1]. As a result, Black can make the white stones heavy:

[Diagram]
Probe: continuation to B2 Bomber  


Go Seigen variant of 3-4, keima, high wide pincer

Another way it can arise, also via a double tiger-mouth, is from a variant of a classic 3-4 joseki after a keima approach and high wide pincer preferred by Go Seigen (according to Guo Juan in a [ext] lecture in her internet Go school):

[Diagram]
Classic joseki  

This is the classic joseki, but she thinks that Go Seigen dislikes letting White get such good shape.


Instead, she says, he preferred to play atari with B7:

[Diagram]
Go Seigen variant, 110  
[Diagram]
Go Seigen variant, 1116  

After a couple of peeps, White has a B2 Bomber, while Black has a very flexible shape.

Note the order of the peeps: if Black plays B15 first, White need not connect after the second peep at B13.


Notes

[1] See e.g. the section Some Important Terms and Concepts in 501 Opening Problems.


B2 Bomber last edited by PJTraill on January 9, 2022 - 23:06
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