3554 enclosure
Keywords: Opening
White may be able to play at (as slide or submarine). Then this sequence is standard,
being correct shape (at a leaves bad aji).
There are various ways to enclose the corner more securely: was an idea of Kubouchi Shuchi. Black a is common but Black b is probably most popular from the point of view of corner safety.
![[Diagram]](../../diagrams/27/25d448c38647e5dbda4048e3054d8b4f.png)
3554 enclosure opening
This isn't often seen in pro games. White a, Black b is a continuation seen in a couple of examples.