Jabberwocks
This opening formation based on 3-5 points has been played often by Ishida Yoshio.
There is a clear idea here: if Black encloses with 1 and White plays 2, Black can continue with the press at a, or (more likely for pros) with the taisha joseki at b. Black then is threatening to build a broad framework across the whole side. If Black does play the taisha, White by adopting one of the simplifying lines will only help Black's strategy.
Therefore White's approach at 1 is seen as early as move 4 of the game. Black may still be aiming to play taisha at c.
This fuseki illustrates some taisha-led thinking. If White plays 2 in the adjacent corner as shown, then after 3 and 4 White 2 can act as a ladder-breaker in a taisha to come.
If White played in one of the other two corners, that wouldn't be true. For example White 2 here means Black will be able to set up the 'jabberwock' plan of the first diagram, or to play a taisha with all ladders good after White 4. This may not be provably bad for White, of course.
Material from this page moved to Carrollian developments.
See also Crab Eyes (parallel 3-5 points).
Mostly there is no Japanese name for side formations - 'crab's eyes' is one, but exceptional. Jabberwock is just something I made up (after the Lewis Carroll poem, about a scary hard-to-define monster and how to slay it ...)
This is a thoughtful and interesting page. --Hu of KGS
Quite brillig. -- Bill
My favorite! -- lovely
Also see my thoughts and variations on the double mokuhazushi fuseki -- mafutrct
gaius: This opening is one of my favourites. I recently started to experiment with what I call the "slanty-ren-sei" fuseki:
Against an approach move at A, the press at B builds a nice center moyo. The approach move at C can be easily pincered at D (or taisha, maybe, depending on the whole-board position). I used to play at E instead of the middle hoshi point, but it feels a bit too far from the left and too close to the right. It looks so much nicer though :) What are your thoughts? It appears to be novel, as neither pattern gives hits on GoBase.