Double Fortress#Katō variation

{{shogi diagram

| floatright

| Double Fortress

| –

| lg | | | | | | | ng | lg

| | rg | | sg | | | gg | kg |

| | | ng | pg | | gg | sg | pg | pg

| | pg | pg | bg | pg | pg | pg | |

| pg | | | | | | | | ps

| | | ps | ps | ps | | ps | ps |

| ps | ps | ss | gs | | ps | ss | |

| | ks | gs | bs | | | | rs |

| ls | ns | | | | | | ns | ls

| –

| Hifumi Katō vs Sōta Fujii 2016 after 38 moves{{cite web | url=https://shogidb2.com/games/12aa48b21c47e76afd0b6b65bc0f28ab017f3a98 | title=加藤一二三 vs. 藤井聡太竜王戦 }}

}}

The Double Fortress (相矢倉 or 相櫓 aiyagura) is a shogi opening in which both players construct Fortress formations.

Double Fortress games are the most common type of Fortress games found at all levels of play.

Historical Fortress

Earlier josekis for Fortress in the Edo period (usually spelled 櫓 at that time) were very different from the current josekis.

In one variation, White delays pushing their rook pawn (whereas Black delays the rook pawn push in the modern era) and there is an early bishop trade before both players' kings are moved into their castles.

In the 1947 Meijin tournament, Masao Tsukada and Yoshio Kimura played an early example of the typical 3. S-77 type of Fortress with 1.P-76 P-84 development found in modern shogi.{{cite web | url=https://shogidb2.com/games/201e12f1b4a87ad539354511f1569c0a7eeb38aa | title=塚田正夫 vs. 木村義雄名人戦 }}

{{shogi diagram

|

| Tsukada vs Kimura 1947
up to move 14

| –

| lg | ng | | gg | kg | gg | | ng | lg

| | rg | | sg | | | | bg |

| pg | | pg | pg | | pg | sg | pg | pg

| | | | | pg | | pg | |

| | pg | | | | | | ps |

| | | ps | | ps | | | |

| ps | ps | ss | ps | | ps | ps | | ps

| | bs | | | | ss | | rs |

| ls | ns | | gs | ks | gs | | ns | ls

| –

| 1. P-76 P-84

2. S-78 P-34

3. S-77 S-62

4. P-26 S-42

5. P-25 S-33

6. S-48 P-85

7. P-56 P-54

}}

1. P-76 P-84 development

{{shogi diagram

|

| (Gold) Fortress Castle

| –

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | ss | gs | | | | |

| | ks | gs | | | | | |

| ls | ns | | | | | | |

| –

|

}}

{{shogi diagram

|

| Fortress
up to move 2

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | dah| pg | pg | pg | pg | pg | pg | pg

| | pgl| | | | | | |

| | | | | | | | |

| | | ps | | | | | |

| ps | ps | uah| ps | ps | ps | ps | ps | ps

| | bs | | | | | | rs |

| ls | ns | ss | gs | ks | gs | ss | ns | ls

| –

| 1. P-76 P-84

}}

{{shogi diagram

|

| Fortress
up to move 3

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | pg | pg | pg

| | pg | | | | | | |

| | | | | | | | |

| | | ps | | | | | |

| ps | ps | | ps | ps | ps | ps | ps | ps

| | bs | | ssl| | | | rs |

| ls | ns |durh| gs | ks | gs | ss | ns | ls

| –

| 2. S-68

}}

{{shogi diagram

|

| Fortress
up to move 4

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | dah| pg | pg

| | pg | | | | | pgl| |

| | | | | | | | |

| | | ps | | | | | |

| ps | ps | | ps | ps | ps | ps | ps | ps

| | bs | | ss | | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 2. ...P-34

}}

=3. S-77: Blocking bishop with silver=

{{shogi diagram

| floatright

| Fortress
up to move 5

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | pg | | | | | pg | |

| | | | | | | | |

| | | ps | | | | | |

| ps | ps | ssl| ps | ps | ps | ps | ps | ps

| | bs | |dulh| | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 3. S-77

}}

Blocking White's bishop with a silver (and also defending the eighth file from a possible attack) is an older Fortress joseki, which typically also includes advancing Black's rook pawn.

The more recent joseki advances Black's pawn on the sixth file instead. (See above.)

==Classic Fortress 24-Move Set==

{{shogi diagram

| floatright

| Classic Fortress
up to move 24

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | | pg | pgl| pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | ps |

| ps | ps | ss | | | ps | | | ps

| | | gs | | gs | ss | | rs |

| ls | ns | bs | ks | | | | ns | ls

| –

|

}}

Classic Fortress 24-Move Set (旧矢倉24手組 kyū yagura nijū-tegumi)

Compared to the New Fortress 24-Move Set, note that the Classic Fortress 24-Move Set is (a) symmetrical where both sides have the same formation and (b) that only Black's formation differs (White's formation is the same in both the old and new josekis.)

===Right Gold to 67 variant===

{{shogi diagram

|

| Right Gold to 67
up to move 25

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | ps |

| ps | ps | ss | gsl| | ps | | | ps

| | | gs | | | ss | | rs |

| ls | ns | bs | ks | | | | ns | ls

| –

| 25. G58-67

}}

{{shogi diagram

|

| Right Gold to 67
up to move 26

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | | | gg | |

| pg | | | pg | | ggl| sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | ps |

| ps | ps | ss | gs | | ps | | | ps

| | | gs | | | ss | | rs |

| ls | ns | bs | ks | | | | ns | ls

| –

| 25. ...G52-43

}}

Right Gold To 67 (6七金右 roku-nana kin migi)

===Spearing the Sparrow===

{{shogi diagram

| floatright

| Spearing the Sparrow
up to move 25

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | ps | psl

| ps | ps | ss | | | ps | | |

| | | gs | | gs | ss | | rs |

| ls | ns | bs | ks | | | | ns | ls

| –

| 25. P-16

}}

Spearing the Sparrow (雀刺し suzume-zashi)

=3. P-66: Blocking bishop with pawn=

{{shogi diagram

|

| Fortress
up to move 5

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | pg | | | | | pg | |

| | | | | | | | |

| | | ps | psl| | | | |

| ps | ps | | uah| ps | ps | ps | ps | ps

| | bs | | ss | | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 3. P-66

}}

{{shogi diagram

|

| Fortress
up to move 6

|

| lg | ng |ddrh| gg | kg | gg | sg | ng | lg

| | rg | | sgl| | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | pg | | | | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | | ss | | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 3. ...S-62

}}

At move 6, White also has an option to play Climbing Silver by advancing their rook pawn to rank 5. (See: White Climbing Silver.)

{{shogi diagram

|

| Fortress
up to move 7

| –

| lg | ng | | gg | kg | gg | sg | ng | lg

| | rg | | sg | | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | pg | | | | | pg | |

| | | | | | | | |

| | | ps | ps | psl| | | |

| ps | ps | | | uah| ps | ps | ps | ps

| | bs | | ss | | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 4. P-56

}}

{{shogi diagram

|

| Fortress
up to move 10

| –

| lg | ng | | gg | kg | gg |ddlh| ng | lg

| | rg | | sg | | sgl| | bg |

| pg | | pg | pg | dah | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | | ss | | ss | | rs |

| ls | ns | | gs | ks | gs | | ns | ls

| –

| 4. ...P-54

5. S-48 S-42

}}

{{shogi diagram

|

| Fortress
up to move 11

| –

| lg | ng | | gg | kg | gg | | ng | lg

| | rg | | sg | | sg | | bg |

| pg | | pg | pg | | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | | ss | gsl| ss | | rs |

| ls | ns | | gs | ks |dulh| | ns | ls

| –

| 6. G49-58

}}

{{shogi diagram

|

| Fortress
up to move 14

| –

| lg | ng | | gg | rah| kgl| | ng | lg

| | rg | | sg | | sg | gg | bg |

| pg | | pg | pg | | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | gs | ss | gs | ss | | rs |

| ls | ns | |dulh| ks | | | ns | ls

| –

| 6. ...G-32

7. G-78 K-41

}}

{{shogi diagram

|

| Fortress
up to move 15

| –

| lg | ng | | gg | | kg | | ng | lg

| | rg | | sg | | sg | gg | bg |

| pg | | pg | pg | | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | gs | ss | gs | ss | | rs |

| ls | ns | | ksl| lah| | | ns | ls

| –

| 8. K-69

}}

{{shogi diagram

|

| Crab Castle

| –

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | | | |

| | bs | gs | ss | gs | | | |

| ls | ns | | ks | | | | |

| –

|

}}

==New Fortress 24-Move Set==

{{shogi diagram

| floatright

| Fortress
up to move 24

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | | pg | pgl| pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | | ps | ps

| | | gs | | | ss | | rs |

| ls | ns | bs | ks | | | | ns | ls

| –

|

}}

New Fortress 24-Move Set (新矢倉24手組 shin yagura nijū-tegumi)

=Quick Fortress castling=

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | gg | kg | | | ng | lg

| | rg | | sg | | sg | gg | bg |

| pg | | pg | pg | | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | gsl| | ps | ps | ps | ps

| | bs | | ss |dulh| ss | | rs |

| ls | ns | | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | gg | rah| kg | | ng | lg

| | rg | | sg | | sg | gg | bg |

| pg | | pg | pg | | pg | | pg | pg

| | pg | | | pg | | pg | |

| | | | | | | | |

| | | ps | ps | ps | | | psl|

| ps | ps | | gs | | ps | ps | uah| ps

| | bs | | ss | | ss | | rs |

| ls | ns | | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

| floatright

| Fujii Quick castling

| –

| lg | ng | | gg | | kg | | ng | lg

| | rg | | sg | | sg | gg | bg |

| pg | | dah| pg | | pg | | pg | pg

| | pg | pg | | pg | | pg | |

| | | | | | | | psl|

| | | ps | ps | ps | | | uah|

| ps | ps | | gs | | ps | ps | | ps

| | bs | | ss | | ss | | rs |

| ls | ns | | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | gg | | kg | | ng | lg

| | rg | | sg | |ddrh| gg | bg |

| pg | | | pg | | pg | sg | pg | pg

| | pg | pg | | pg | | pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | | |

| ps | ps | ssl| gs | | ps | ps | | ps

| | bs | |dulh| | ss | | rs |

| ls | ns | | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | gg | | kg | bg | ng | lg

| | rg | | sg | | | gg |dulh|

| pg | | | pg | | pg | sg | pg | pg

| | pg | pg | | pg | | pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | | |

| ps | ps | ss | gs | | ps | ps | | ps

| |ddrh| | | | ss | | rs |

| ls | ns | bsl| gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | |ddrh| | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | pg | sg | pg | pg

| | pg | pg | | pg | | pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | psl| |

| ps | ps | ss | gs | | ps | uah| | ps

| | | | | | ss | | rs |

| ls | ns | bs | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | dah| sg | pg | pg

| | pg | pg | | pg | pgl| pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | | | ps

| | | | | | ss | | rs |

| ls | ns | bs | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Fujii Quick castling

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg |ddrh| | gg | |

| pg | | | pg | | ggl| sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | | ps

| | | | | |durh| | rs |

| ls | ns | bs | gs | ks | | | ns | ls

| –

|

}}

{{shogi diagram

| floatright

| Fujii Quick castling

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | | | gg | |

| pg | | | pg | | gg | sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | ps |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | | ps

| | | | ksl| | | | rs |

| ls | ns | bs | gs |dulh| | | ns | ls

| –

|

}}

Quick Fortress castling

=White's Fortress Climbing Silver=

{{shogi diagram

|

| White Climbing Silver
up to move 6

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | dah| | | | | pg | |

| | pgl| | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | | | | ps | ps | ps | ps

| | bs | | ss | | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 3. ...P-85

}}

{{shogi diagram

|

| White Climbing Silver
up to move 7

| –

| lg | ng | sg | gg | kg | gg | sg | ng | lg

| | rg | | | | | | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | | | | | | pg | |

| | pg | | | | | | |

| | | ps | ps | ps | | | |

| ps | ps | ssl| | | ps | ps | ps | ps

| | bs | |dulh| | | | rs |

| ls | ns | | gs | ks | gs | ss | ns | ls

| –

| 4. S-77

}}

=Silver-37 variations=

{{shogi diagram

| floatright

| S-37

| –

| lg | ng | | | | kg | bg | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ssl| ps | ps

| | | gs | | |durh| | rs |

| ls | ns | bs | ks | | | | ns | ls

|–

| 13. S-37

}}

{{shogi diagram

|

| White's usual response

| –

| lg | ng | | | | kg |dads| ng | lg

| | rg | | sg | gg | da | gg | |

| pg | | | pg | dad| | sg | pg | pg

| | pg | pg | bgl| pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | ps | ps

| | | gs | | | | | rs |

| ls | ns | bs | ks | | | | ns | ls

|–

| 13. ...B-64

}}

After the 24-move set of the Fortress opening, one major branch in the Fortress strategies is the Silver-37 set of variations. Many variations are under this parent variation.

==Katō variation==

{{shogi diagram

|

| Bishop moves for king

| –

| lg | ng | | | | kg | | ng | lg

| | rg | | sg | gg | | gg | |

| pg | | | pg | | | sg | pg | pg

| | pg | pg | bg | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | ps | ps

| | | gs | bsl| | | | rs |

| ls | ns | | ks | | | | ns | ls

|–

| 14. B-68

}}

{{shogi diagram

|

| Castle construction

| –

| lg | ng | | | | rah| kgl| ng | lg

| | rg | | sg |ddrh| | gg | |

| pg | | | pg | | gg | sg | pg | pg

| | pg | pg | bg | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | ps | ps

| | | gs | bs | | | | rs |

| ls | ns | ks | lah| | | | ns | ls

|–

| 14. ...G-43

15. K-79 K-31

}}

{{shogi diagram

|

| Castle construction

| –

| lg | ng | | | | |ddrh| ng | lg

| | rg | | sg | | | gg | kgl|

| pg | | | pg | | gg | sg | pg | pg

| | pg | pg | bg | pg | pg | pg | |

| | | | | | | | |

| | | ps | ps | ps | | ps | |

| ps | ps | ss | gs | | ps | ss | ps | ps

| | ks | gs | bs | | | | rs |

| ls | ns |dulh| | | | | ns | ls

|–

| 16. K-88 K-22

}}

{{shogi diagram

|

| Pawn advances

| –

| lg | ng | | | | | | ng | lg

| | rg | | sg | | | gg | kg |

| pg | | | pg | | gg | sg | pg | pg

| | dah| pg | bg | pg | pg | pg | |

| | pg | | | | | | |

| | | ps | ps | ps | | ps | psl| ps

| ps | ps | ss | gs | | ps | ss | uah| uah

| | ks | gs | bs | | | | rs |

| ls | ns | | | | | | ns | ls

|–

| 17. P-16 P-85

18. P-25

}}

Named after Hifumi Katō.

==Waki System==

=Morishita System=

The Morishita System delays moving the right attacking silver to 37 early. Instead, it simply moves the bishop to 68 allowing the king to move into the Fortress castle in subsequent moves.

Other development patterns

=1. P-76 P-34 2. P-66 patterns=

Additionally, earlier Fortress openings in the first part of the 20th century did not follow from the standard 1. P-76 P-84 opening used today and instead developed from mutual opening of the bishop diagonals with 1. P-76 P-34.

=Fortress development from Bishop Exchange=

{{shogi diagram

|

| Typical Bishop Exchange

| –

| lg | ng | sg | gg | kg | | sg | ng | lg

| | rg | | | | | gg | bg |

| pg | | pg | pg | pg | pg | | pg | pg

| | | | | | | pg | |

| | pg | | | | | | |

| | | ps | | | | | ps |

| ps | ps | bs | ps | ps | ps | ps | | ps

| | ss | gs | | | | | rs |

| ls | ns | | | ks | gs | ss | ns | ls

| –

|

}}

{{shogi diagram

|

| Rejected bishop trade

| –

| lg | ng | sg | gg | kg | | sg | ng | lg

| | rg | | | | | gg | bg |

| pg | | pg | pg | pg | dah| | pg | pg

| | | | | | pgl| pg | |

| | pg | | | | | | |

| | | ps | | | | | ps |

| ps | ps | bs | ps | ps | ps | ps | | ps

| | ss | gs | | | | | rs |

| ls | ns | | | ks | gs | ss | ns | ls

| –

|

}}

A Fortress position may also be developed from a rejected Bishop Exchange opening. For example, after a Bishop Exchange setup, instead of White trading the bishops off the board, White may choose to reject the bishop trade by closing their bishop diagonal. At this point, both players may convert their left side configurations into Fortress castles by pulling their bishops back and moving their silvers to the 77 and 33 squares. Thus, Black may move their bishop to 68 (or to 59 if their king moves to 69 first) allowing their left silver to move to 77. Likewise, White may move their bishop to 33 (usually triggered by Black pushing their rook pawn to 25), move their left silver to 22, move their bishop to 42 allowing their left silver to move 33.

Although possible, this Fortress development is not very common among professional players. When White rejects the bishop trade in this way, it is more common for White to play a Snowroof position while Black switches to a Fortress position instead of a Double Fortress game.(ザ・雁木: Ep. 2)

==Game example==

{{shogi diagram

|

| Ueno vs Nishikawa 2008
up to move 20

| –

| lg | ng | sg | | kg | | | ng | lg

| | rg | | | | | gg | sg |

| pg | | pg | pg | | gg | bg | pg | pg

| | | | | pg | pg | pg | |

| | pg | | | | | | ps |

| | | ps | | | ps | | |

| ps | ps | bs | ps | ps | | ps | | ps

| | ss | gs | | gs | ss | | rs |

| ls | ns | | ks | | | | ns | ls

| –

|

}}

{{shogi diagram

|

| Ueno vs Nishikawa 2008
up to move 24

| –

| lg | ng | sg | | kg | | | ng | lg

| | rg | | | | bg | gg | |

| pg | | pg | pg | | gg | sg | pg | pg

| | | | | pg | pg | pg | |

| | pg | | | | | | ps |

| | | ps | | | ps | | |

| ps | ps | ss | ps | ps | | ps | | ps

| | | gs | | gs | ss | | rs |

| ls | ns | | ks | bs | | | ns | ls

| –

|

}}

Hirokazu Ueno vs Keiji Nishikawa 2008.{{cite web | url=https://shogidb2.com/games/e375295892315770d4e97d34fcedd4495f6e5b87 | title=上野裕和 vs. 西川慶二順位戦 }}

Bibliography

{{cite book | last=Aono | first=Teruichi | title=Better moves for better shogi | edition=2nd | orig-year=1983 | year=2009 | publisher=Ishi Press | translator-last=Fairbairn | translator-first=John | isbn=978-4-87187-999-6}}
{{cite book | last=Aono | first=Teruichi | author-link=Teruichi Aono | script-title=ja:将棋定跡のカギ: 和英定跡問題集 | title=Guide to shogi openings: Unlock the secrets of joseki | year=1983 | publisher=山海堂 | translator-last=Fairbairn | translator-first=John | isbn=4-381-00598-8}}
{{cite journal | last=Fairbairn | first=John | date=1981 | title=How to play the fortress opening part 1 | journal=Shogi | issue=29 | pages=4–6 }}
{{cite journal | last=Fairbairn | first=John | date=1981 | title=How to play the fortress opening part 2 | journal=Shogi | issue=30 | pages=14–15 }}
{{cite book| last=Fairbairn | first=John | title=Shogi for Beginners | year=1984 | publisher=Ishi Press | isbn=978-4-8718-720-10}}
{{cite book | last=Hosking | first=Tony | title=The art of shogi | year=1996 | publisher=The Shogi Foundation | isbn=978-0-95310-890-9}}
{{cite book| last=Kitao | first=Madoka | title=Joseki at a glance | year=2011 | author-link=Madoka Kitao | publisher=Nekomado | translator-last=Kawasaki | translator-first=Tomohide | isbn=978-4-9052-2501-0}}
{{cite book | last=Kitao | first=Madoka | title=Sabaki at a glance | year=2013 | publisher=Nekomado | translator-last=Kawasaki | translator-first=Tomohide | isbn=978-4-9052-2510-2}}
{{cite web|url=http://www.shogi.net/quest/|script-title=ja:消えた戦法の謎|title=kieta senpō no nazo|trans-title=Quest of the lost systems|website=Shogi.Net|year=1995|publisher=Mainichi Communications Co.|ref={{harvid|Quest of the Lost Systems|1995}}}} · Partial translation of 消えた戦法の謎 kieta senpō no nazo by Kiyokazu Katsumata.
{{cite book | last=Yebisu | first=Miles | year=2016 | title=Comprehensive shogi guide in English: How to play Japanese chess | publisher=Laboratory Publishing}}
{{cite episode | year=2017 | title=ザ・雁木: ▲８八銀５六歩型の駒組み | number=2 | series=増田康宏の将棋講座 | network=銀河将棋チャンネル | via=Niconico }} {{in lang|ja}}

References

External links

How to Defend in Shogi (by Yasuharu Ōyama):
[http://www.shogi.net/nexus/ukekata/part4.html Basic Formation 4: Yagura]
[http://www.shogi.net/nexus/ukekata/part5.html Basic Formation 5: Gin-yagura]
YouTube Hidetchi's:
[https://www.youtube.com/watch?v=h7jPat3_WG4 Yagura #1]
[https://www.youtube.com/watch?v=SdP8o12NCig Rapid Encountered Yagura, Primitive Climbing Silver]
Shogifan 将棋ファン: {{usurped|1=[https://web.archive.org/web/20161118054450/http://shogifan.com/2016/10/28/yagura-1/ Yagura -1 矢倉]}}
Shogi Openings (professional Akira Nishio's blog):
[http://kingcrimsondiscipline.blogspot.jp/2014/10/about-yagura-castle.html About a Yagura castle]
[http://kingcrimsondiscipline.blogspot.jp/2014/08/yagura-silver-46-strategy.html Yagura: Silver-46 Strategy (1)]
[http://kingcrimsondiscipline.blogspot.jp/2014/11/basic-tactics-for-breaking-yagura.html Basic Tactics For Breaking Yagura Castle (1)]
[http://kingcrimsondiscipline.blogspot.jp/2014/11/basic-tactics-for-breaking-yagura_25.html Basic Tactics For Breaking Yagura Castle (2)]
[http://kingcrimsondiscipline.blogspot.jp/2014/12/basic-tactics-breaking-yagura-castle-3.html Basic Tactics For Breaking Yagura Castle (3)]
[http://kingcrimsondiscipline.blogspot.jp/2014/12/basic-tactics-for-breaking-yagura.html Basic Tactics For Breaking Yagura Castle (4)]
Shogi Shack:
[http://www.shogishack.net/pages/shogi-strategies/opening-showcase/yagura-intro.html Yagura Intro]
[http://www.shogishack.net/pages/study-room/shogi-openings/yagura-s-3g.html Yagura Silver-3g]
[http://www.shogishack.net/pages/study-room/shogi-openings/climbing-silver-against-yagura.html Climbing Silver Against Yagura]
Yoshiharu Habu and Modern Shogi: [http://modernshogi.pbworks.com/w/page/21604134/Chapter%201 Chapter 1: Yoshiharu Habu and the Changing Modern Shogi]
[http://modernshogi.pbworks.com/w/page/21604134/Chapter%201 Chapter 1: Yoshiharu Habu and the Changing Modern Shogi]
[http://modernshogi.pbworks.com/w/page/21604141/Chapter%206 Chapter 6: Akira Watanabe, Who Utilized the Window of Opportunity]
Yamajunn's Basic Shogi Opening:
[http://yamajunnshogi.web.fc2.com/CCP039.html Yagura]
[http://yamajunnshogi.web.fc2.com/CCP021.html Yagura: Yonte Kaku]
Shogi Opening:
[http://www44.atpages.jp/studyshogi/opening/yagura/p55-rapid-attack.html Yagura: Akutsu Style Pawn-55 Rapid Attack]
[http://www44.atpages.jp/studyshogi/opening/yagura/ClimbingSilver.html Yagura: Time Lugging Climbing Silver]
[http://www44.atpages.jp/studyshogi/opening/yagura/3-move-bishop-strategy.html Yagura: 3 Move Bishop Strategy]
Yet Another Shogi Site:
[http://dota2kupo.byethost32.com/openings/rapid/yonenagaP35.php Yagura Rapid Attack: Yonenaga/Fujimori style against ▲P35 variation]
[http://dota2kupo.byethost32.com/openings/rapid/yonenagaP35.php Double Yagura: Identical formation]
Quest of the Lost Systems: [http://www.shogi.net/quest/q1-yagura-1.txt Yagura: R-2i Formation]
Global Shogi: [http://shogiglobal.blogspot.gr/2017/04/double-yagura-aiyagura.html Double Yagura (AiYagura-相矢倉)]
Shogi Maze:
[http://shogimaze.free.fr/senpou/openings002001.html Yagura Opening Formation]
[http://shogimaze.free.fr/senpou/openings010001.html Yagura Strategy: How To Build The Formation]
[http://shogimaze.free.fr/senpou/openings011001.html Yagura Strategy: Battle 1]
[http://shogimaze.free.fr/senpou/openings012001.html Yagura Strategy: Battle 2]
[http://shogimaze.free.fr/senpou/openings122001.html Ai-SouYagura: Check Of Sennichite 1]
[http://shogimaze.free.fr/senpou/openings123001.html Ai-SouYagura: Check Of Sennichite 2]
[http://shogimaze.free.fr/senpou/openings124001.html Ai-SouYagura: Check Of Sennichite 3]
[http://shogimaze.free.fr/senpou/openings125001.html Yagura: Gote's Quick Attack With Bogin 1]
[http://shogimaze.free.fr/senpou/openings126001.html Yagura: Gote's Quick Attack With Bogin 2]
[http://shogimaze.free.fr/senpou/openings127001.html Yagura: Silver-3g Strategy]
[http://shogimaze.free.fr/senpou/openings128001.html Yagura: Sente's Quick Battle Opening with Pawn-3e]
[http://shogimaze.free.fr/senpou/openings132001.html Yagura: Yonenaga-ryu Quick Attack]
将棋タウン: [https://www.shogitown.com/school/dictionary/strategy/i-yagura.html 矢倉戦法]

Category:Shogi openings

Category:Static Rook openings

Category:Fortress openings

Double Fortress#Katō variation

Historical Fortress

1. P-76 P-84 development

=3. S-77: Blocking bishop with silver=

==Classic Fortress 24-Move Set==

===Right Gold to 67 variant===

===Spearing the Sparrow===

=3. P-66: Blocking bishop with pawn=

==New Fortress 24-Move Set==

=Quick Fortress castling=

=White's Fortress Climbing Silver=

=Silver-37 variations=

==Katō variation==

==Waki System==

=Morishita System=

Other development patterns

=1. P-76 P-34 2. P-66 patterns=

=Fortress development from Bishop Exchange=

==Game example==

See also

Bibliography

References

External links