[1] The Nakahara castle is characterized by the close positioning of golds and silvers around the king.
The original castle itself was a simple one in which the silver was pushed one square directly above from its initial position.
Incidentally, this castle can also be found in a shogi book explaining the Double Wing Attack style played in the Edo period.
While it looks shabby, the formation is low and the king has a wide escape route regardless of what side it is attacked from.
[6] In recent years, there has been research on how to set up a Nakahara castle formation to strengthen the solidity of the king for Black's Side Pawn Capture, while a reversed Right Nakahara castle has been used, if rarely, in Double Ranging Rook games.