Pinwheel (shogi)

In shogi, the Pinwheel (風車 kazaguruma) is an uncommon opening with the rook on the bottom rank 9 enabling it to switch between a Ranging Rook and Static Rook attack.

Itō's Pinwheel (伊藤流風車)
☖ pieces in hand: –
987654321 
         1
         2
         3
         4
   歩 桂   5
歩 歩 歩歩歩 歩6
 歩桂銀 銀   7
  金 金玉   8
香      飛香9
☗ pieces in hand: 角

The pinwheel name comes from the way the king is able to rotate around the gold positioned on the 58 square as if it were a wheel.

Against Static Rook Anaguma

Example of development from Habu (1992).

1. P-76 P-84

2. S-68 P-34

3. P-66 S-62

4. R-58 K-42

5. K-48 K-32

6. K-38 B-33

7. P-56 P-54

8. S-48

8... K-22

9. S-66 S-53

10. P-46 L-12

11. P-36 K-11

12. S-47 S-32

13. G-48 P-85

14. B-77 G-52

15. N-37 P-44

16. P-55

16... Px55

17. Rx55 P*54

18. R-59 G-43

19. P-16 P-14

20. P-26 G-31

21. G-78 P-74

22. B-68 P-94

23. P-96 R-72

24. G-77 P-75

Central Rook Pinwheel
☖ pieces in hand: 歩
987654321 
香桂    金桂王1
  飛    銀香2
   歩銀金角歩 3
歩   歩歩歩 歩4
 歩       5
歩 歩歩 歩歩歩歩6
 歩金銀 銀桂  7
   角 金玉  8
香桂  飛   香9
☗ pieces in hand: 歩

25. Px75 Rx75

26. P*76 R-72

Game example
Ōyama vs Ariyoshi 1991
☖ pieces in hand: 歩
987654321 
香桂    金桂王1
  飛    銀香2
歩  歩銀金角歩 3
    歩歩歩 歩4
 歩 歩     5
歩 歩 銀歩歩 歩6
 歩角金 銀桂歩 7
     金玉  8
香桂  飛   香9
☗ pieces in hand: 歩
up to move #51

A similar position occurs in a 1991 game between Yasuharu Ōyama (Black) and Michio Ariyoshi (White).

Itō's Pinwheel variations

Bibliography
  • 羽生 [Habu], 善治 [Yoshiharu]. 1992 [2010]. 居飛車穴熊vs中飛車. 羽生の頭脳: 居飛車穴熊と左美濃 (Vol. 4, Chap. 3). 日本将棋連盟.
  • 伊藤 [Itou], 果 [Hatasu]. 1994. 風車の美学: 伊藤果直伝! 毎日コミュニケーションズ. ISBN 4-89563-601-1
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