Zero-space pincers

Shoulderhit  

This shoulder play has its uses, but unless Black is strong in the centre it may just be a trick play. See BQM41.

An idea to settle the position  

This was seen in an old Go Seigen-Hashimoto Utaro game. It isn't a ridiculous choice, assuming White can handle Black a in reply - see 6-3 point Another oddity in 3-6 point pincers.

The 'Korean' play  

This strange idea actually goes back a long way, when is at a. It is only in recent years (comment made in 2002) that variations have been accepted as joseki. See 4-4 point low approach low extension, slide, attach.