- For the humorous article under this name until 2019-11-18, see The Power of the B2 Bomber
The B2 Bomber is a name for a heavy lump of 6 stones, a dango. The name alludes to the shape of the Northrop Grumman B-2 Spirit bomber.
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Probe and mistaken continuation
Probe: continuation to !B2 Bomber
Go Seigen variant, 1–10
Go Seigen variant, 11–16
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:
should have been further out at a. As a result, Black can make the white stones heavy:
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 lecture in her internet Go school):
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 :
After a couple of peeps, White has a Bomber, while Black has a very flexible shape.
Note the order of the peeps: if Black plays first, White need not connect after the second peep at .
 See e.g. the section Some Important Terms and Concepts in 501 Opening Problems.