Anaguma is a deep corner castle used in both Ranging-Rook and Static-Rook systems. It can provide exceptional practical King safety, but it is not invulnerable and is not automatically the strongest choice in every position.
Ranging-Rook Anaguma Reference
For Sente Ranging Rook, a common reference places the King on 1i, Lance on 1h, Silver on 2h, and Golds around 3h and 4i. The Lance must vacate 1i before the King can enter.
Trade-off
The corner and several defenders can make checks difficult to create, buying attacking time. Construction is slow, however, and the pieces can become cramped. If the opponent opens the position before completion, the investment may become a liability.
Do Not Compare Castles by Name Alone
Static-Rook Anaguma is built on the opposite wing and has different move-order problems. A useful comparison includes the opening, whose Bishop diagonal is open, the opponent’s attack speed, and whether your castle pieces have legal routes to their target squares.
Endgame Habit
Count forcing moves rather than assuming the corner King gives unlimited time. Once the outer Golds and Silver are removed, a King trapped in 1i can have very few escape squares.
Verify the Corner Structure
On the reference board, the King occupies 1i only after the Lance has moved to 1h. Silver 2h and Gold 3h form the closest defensive layer; Gold 4i is the next connection toward the center. Knight 2i remains in its starting corner area. These coordinates explain the nameable structure without claiming that the route is safe in every opening.
Safety Is Not the Same as Escape Space
A corner King may be difficult to check while the surrounding generals remain connected. The same corner also limits natural King movement. If the Silver and Gold are removed, the edge and board boundary can help the attacker restrict escapes. Evaluate both the number of immediate checks and the number of legal replies.
| Correct evaluation | Common overstatement |
|---|---|
| The completed structure can require several forcing moves to break. | Anaguma cannot be mated. |
| Construction consumes moves and may be interrupted. | Reaching 1i is always worth the time. |
| Static-Rook and Ranging-Rook Anaguma use different wings and routes. | All Anaguma positions share one move order. |
Practical Counting Task
From the displayed shape, remove one defender mentally and recount the checking moves against 1i. Then restore it and imagine the opponent has a Rook or Gold in hand. This shows why pieces in hand and current lines matter more than the reputation of the castle.
Sources and Scope
Rule statements are checked against the current Japan Shogi Association playing rules. Castle terminology and opening pairings were cross-checked with the Japan Shogi Association beginner-course material. The board on this page is a 51Shogi coordinate reference, not a claim that one final arrangement or move order is mandatory in every opening.
