Crab Silvers

The Crab Silvers (カニカニ銀 kani kani gin) is a shogi opening. It's a type of Rapid Attack Fortress opening, used mostly when playing Black (sente). It's often classified as a trap opening. It was created by professional shogi player Kōichi Kodama[1], for which he received the prestigious Kōzō Masuda Award in 2003.

Crab Silvers
☖ pieces in hand: –
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香桂  王金 桂香1
 飛 銀   角 2
歩 歩歩 金銀歩歩3
    歩歩歩  4
 歩     歩 5
  歩 歩銀   6
歩歩銀歩 歩歩 歩7
 角     飛 8
香桂 金玉金 桂香9
☗ pieces in hand: –

Overview

Due to the large amount of freedom of the rook to enter into the game, finding ways to attack even in the middle of a Rapid Attack Fortress has quite the merit.

Unlike the Double-Silver Rapid Attack Fortress, king and gold don't move at all from their initial position (Sitting king). In the fifth movement, rather than pushing P-66, the silver is pushed to S-77. Instead of opting not to push the rook pawn from Fortress, White (gote) will play S-33 following Black's rook pawn being pushed to P-25, which will be followed by ▲S-48, ▲P-56, ▲S-57, ▲S-46. After that, if White (gote) were to push the pawn in the 5th file, the rook will go to the center file with ▲R-58, and then, for example, ▲B-97, ▲S-66, ▲N-77, with the aim of breaking through the center[2].

Although at first it was frequent for White (gote) to unthinkingly push the gold to △G-32, since it was difficult for Black (sente) to defend from a breakthrough from the center, making preparations beforehand by playing △G61-52 became more frequent. When aiming to attack from the center, pushing the pawn in the 3rd file with ▲P-36 allows the rival to attack the king on its weak points and also delays the attack, so it's often considered a bad move[3].

gollark: There're concurrent hashmaps and stuff presumably implemented with `unsafe`.
gollark: (thread-safe reference-counting pointer to a mutex to a T)
gollark: i.e. if I tried to just pass a mutable reference to a map to all of the stuff I run in different threads, it'd be a compiler error, so instead it's a `Arc<Mutex<T>>`.
gollark: Well, you can spawn threads, and the type system prevents weirdness with concurrency.
gollark: Oh, and Rust has that nice thing where you can't keep around both a mutable reference and immutable references to stuff.

See also

References
  1. 児玉孝一『必殺！カニカニ銀: ―究極の二枚銀戦法』（1992年、日本将棋連盟、ISBN 4-8197-0309-9）
  2. 児玉孝一『必殺！カニカニ銀: ―究極の二枚銀戦法』（1992年、日本将棋連盟、ISBN 4-8197-0309-9）
  3. 児玉孝一『必殺！カニカニ銀: ―究極の二枚銀戦法』（1992年、日本将棋連盟、ISBN 4-8197-0309-9）

Bibliography
  • 児玉孝一『必殺！カニカニ銀: ―究極の二枚銀戦法』（1992年、日本将棋連盟、ISBN 4-8197-0309-9） (Koichi Kodama's 'Hissatsu! Kani kani gin' or "Knockout! Crab Silvers: The Ultimate Two-Silvers Opening").
  • 青野照市『プロの新手28』（1989年、日本将棋連盟）
  • 神谷広志『奇襲虎の巻』（2003年[文庫化時のもの、当初の発行年は1994年]、毎日コミュニケーションズ）130-145頁
  • 塚田泰明監修・横田稔著『序盤戦！！囲いと攻めの形』（1998年、高橋書店）
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