Step 1: Static Rook Castles
Castle Guide › Step 1 / 3
In static rook (ibisha) play, the right castle depends heavily on whether your opponent plays ranging rook or static rook. Against a ranging rook opponent, battles happen on the right side of the board, so you move your King to the left to shelter it. Against a static rook opponent, you castle on the left. Knowing the key formations for both scenarios gives you a solid foundation.
Boat Castle 舟囲い
The Boat Castle is the go-to minimal defense when your opponent plays ranging rook. You simply shift your King to the left and advance the Gold and Silver on the right — it's quick and easy to remember.
Durability is low, but the point isn't to be impenetrable — it's to get your King out of harm's way fast so you can focus on attacking. Not recommended against static rook opponents, as the King's position becomes a target for their Rook.
Crab Castle カニ囲い
The Crab Castle is the minimal defense for static rook vs static rook games. The Gold and Silver cover the King from above, offering a basic but recognizable form.
Durability is limited — a determined attack will break through. This is a castle for players who want to spend as few moves as possible on defense and launch an attack quickly.
Elmo Castle エルモ囲い
The Elmo Castle has risen to become the new standard defense against ranging rook. It takes a few more moves than the Boat Castle, but the connected Gold and Silver formation gives it noticeably better durability.
It's the attack-first player's upgrade from the Boat Castle. Note that it doesn't develop further — if the game becomes a long-term battle, it can feel cramped.
Gangi 雁木囲い
Gangi has risen dramatically in popularity in recent years and is now a core static rook formation. Its defining strength is positional balance — it adapts flexibly to a wide range of opponent strategies.
The central thickness lets you absorb attacks and counter effectively. The downside is that fast, aggressive opponents can pressure you before the castle is fully set up.
Yagura 矢倉囲い
Yagura is the classical fortress of static rook play, sometimes called "the pure literature of shogi." The tight cluster of Gold and Silver pieces gives it excellent top-end durability, and it has been studied for generations.
The trade-off is time — it takes many moves to complete, and modern opponents will often attack before you finish. Beginners may find it difficult to handle the midgame pressure. Best picked up after you have some experience.