The shape is not new. It appeared in 1666 in a game between Honinbo Sanetsu and Yasui Sanetsu. Sanetsu chose to tenuki. The modern style is to respond.

Honinbo Shusai was the first to choose a response for Black, at B against Karigane Junichi in 1902. The overwhelmingly usual move is at A (107 out of 120 examples). Our first example is due to Shinohara Masami in 1952 against Go Seigen. C has had a few adherents. D looks like a shape move but we have only one example. E, the new move, has until now been regarded an amateur 1-dan move.

This is a typical continuation. The thinking has been that 1 is valuable because it forces White to play 4, though as a liberty-filling move it has drawbacks, too.

By deferring the push and playing the new 1 here, Black is hoping to tempt White into making a weak group.

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