Shogi Openings
There are four major Shogi Systems being played. Rather than trying to understand by words, click the links to see how each systems are being played on animated Shogi boards.
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Ai-gakari (相掛かり) or Double Wing Attack
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Both players exchange Rooks' pawn at the beginning. There are various Senpo (戦法=Battle tactics) that belongs to Ai-gakari category:
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Bogin (棒銀=Climbing Silver) System
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Kaku-Gawari (角換わり) or Bishop Exchange
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Bishop will be exchanged early in the game. Rook's pawn remain on the board. Again, there are several variants in this category.
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Bogin (棒銀=Climbing Silver) This is not the same as Ai-gakari Bogin
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The above three systems possesses Paper/Scisors/Stone relationships to each other.
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The name came from it's castling formation. Neither Bishop or Rook's pawn will be exchanged in the beginning. There are so many Yagura systems. Explaining all would take up many pages. (I will add resource references later) the link above shows very basic formation.)
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I really like this opening. For what it's worth, here are more tactics.
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Furi Bisya (振り飛車) or Ranging Rook
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The word Furi-Bisya means "Swing rook." In this system, either or both players swing the Rook to Bishop's side (left side of the board). This move will concentrate "big guns" to the left. The King will be moved to the right side for safety. Contrary to the popular belief, Furi-bisya by its nature is a defensive system, although there are quite a variety of offensive furi-bisya strategies (such as Rapid-Ishida) are known to exist. Again there are so many variants of this "Ranging Rook" System.
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Jikyuusen Ishida Ryuu(持久戦石田流、or 石田流本組み=Orthodox Ishida)
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If both players swing their rooks, the form is called Ai Furi Bisya(相振り飛車=Ranging Rook vs. Ranging Rook). Ai Furi is becoming more popular these days. See here for demo games of Ai Furi
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More Resources on Shogi openings
Once you understand the fundamentals of openings, there are some more detailed openings shown in "Study Room" section of this site.
For further study, there is a Japanese site named "Chidori gin's Senpou Zukan" that lists more than 100 openings.
I was going to put together the navigation tips about the site. However, Takodori' san beat me to it and I don't need to do it any more! He catalogued the site and posted them here and here. Nice work!