Fortress opening

Fortress (矢倉 or 櫓 yagura) is both a Static Rook opening (矢倉戦法 yagura senpō) and a castle in shogi.

Double Fortress variation
after 32 moves

☖ pieces in hand: –

9	8	7	6	5	4	3	2	1
香	桂						桂	香	1
	飛		銀			金	王		2
歩			歩		金	銀	歩	歩	3
	歩	歩	角	歩	歩	歩			4
									5
		歩	歩	歩		歩			6
歩	歩	銀	金		歩	銀	歩	歩	7
	玉	金	角				飛		8
香	桂						桂	香	9

☗ pieces in hand: –

A common variation. Both players' kings are fully inside Fortress castles. Black has advanced their right offensive silver to 37 while White's bishop is positioned on 64.

It is usually played in a Double Static Rook opening, which is often a Double Fortress opening. However, it may also occur in different Double Static Rook openings such as Fortress vs Right Fourth File Rook.

The Fortress castle (矢倉囲い yagura gakoi), which is the defining characteristic of Fortress games, was considered by many to be one of the strongest defensive positions in Double Static Rook games in the 1980s.

The term yagura is the Japanese word for a tower-like structure in traditional Japanese castles.

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