Taisha solid connection
This page deals with the standard pattern, following the complex variation of the taisha joseki (also known as taisha tobitsuke), where makes a solid connection. The other two major patterns are a, taisha nobi 1 and b taisha nobi 2.
Black here is a pro play, though rarely used. Examples include Weon Seongjin (4p) vs Lee Yeongkyu (2p) in 2003 andKubomatsu-Kitani in 1934. This is a pushing battle with a hamete in it. Black may look as if it's easy to refute - but beware the two-stone edge squeeze!
This idea appeared in a couple of Go Seigen's games in the 1930s.
That leaves these plays a and b from Ishida unaccounted for; they may be outright tricks. Analysis is given there for a; for b too but that was played differently 1974-06-06 by Hashimoto Utaro against Magari Reiki (game on Gobase).