Double Ranging Rook

In shogi, Double Ranging Rook (also Double Swinging Rook, Mutual Swinging Rook) (相振り飛車 ai-furibisha) is a class of Ranging Rook openings in which both players choose a Ranging Rook position.

The term does not apply when one player (or both) moves their rook to their respective fourth or third files (Right Fourth File Rook, Sleeve Rook) as these are still considered to be Static Rook positions.

Double Ranging Rook games were relatively rare compared with Double Static Rook and Static Rook vs Ranging Rook games. However, more recently, they have gained in popularity somewhat as Fairbairn noted in the 1980s.

The most often played game among professionals is Black's Opposing Rook vs White's Third File Rook.

Opposing Rook vs Third File Rook

Opposing vs Third
△ pieces in hand: –
987654321 
香桂銀金王金銀桂香a
 飛角 b
歩歩歩歩歩歩歩歩c
      歩  d
         e
  歩歩     f
歩歩歩歩歩歩歩g
 角     飛 h
香桂銀金玉金銀桂香i
▲ pieces in hand: –

1. P-7f P-3d.

2. P-6f.

2. ...R-3b.

Opposing Rook's early eighth pawn advance variation

3. B-7g.

Opposing Rook's left silver development


3. S-7h.

Third File Rook's Mino castle with delayed 3e pawn push variation

Opposing vs Third
△ pieces in hand: –
987654321 
香桂王金  桂香a
  銀金飛角 b
歩歩歩歩銀歩 歩歩c
    歩 歩  d
 歩       e
 歩歩     f
歩角銀歩歩歩歩歩g
 飛 金玉   h
香桂 金銀桂香i
▲ pieces in hand: –

3. ...K-6b.

4. S-6g.

4. ...S-7b. Here White starts to create the Mino castle structure giving up the possibility of making an Anaguma.

5. B-7g. Moving up the bishop to the seventh file allows a space on the 8h square for the rook to move to. Additionally, the bishop needs to be defended by the left knight as left silver and left gold will eventually be moved to different locations.

5. ...K-7a. The king hunkers down.

6. R-8h.

6. ...S-4b.

7. P-8f.

7. ...P-5d.

8. P-8e.

8. ...S-5c.

9. K-4h.

9. ...G4i-5b.

9. G6i-5h.

Transpositions

The opening position above can be reached by different move sequences, some of which are shown below.

  Black White   Black White
1. P-7f P-3d   P-7f P-3d
2. P-6f R-3b   P-6f P-5f
3. B-7g K-6b   S-7h S-4b
4. S-7h S-7b   S-6g S-5c
5. S-6g K-7a   B-7g R-3b
6. R-8h S-4b   R-8h K-6b
7. P-8f P-5d   P-8f S-7b
8. P-8e S-5c   P-8e K-7a
9. K-4h G4i-5b   K-4h G4a-5b
10. G6i-5h ...   G6i-5h ...

Fourth File to Third File Rook

４→３戦法

The player starts off playing a Fourth File Rook position with an open bishop diagonal that then transitions to a Third File Rook position after the player moves their king into an Incomplete Mino castle. This strategy is flexible to be used against a Ranging Rook opponent (for a Double Ranging Rook game) as well as against a Static Rook opponent.

See also

Bibliography


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