Fourth File Rook

Fourth File Rook   ☖ pieces in hand: – 9 8 7 6 5 4 3 2 1                     1                   2                   3                   4                   5     歩 歩           6 歩 歩     歩 歩 歩 歩 歩 7   角   飛   8 香 桂 銀 金 玉 金 銀 桂 香 9 ☗ pieces in hand: –

Fourth File Rook with Mino Castle ☖ pieces in hand: – 9 8 7 6 5 4 3 2 1                     1                   2                   3                   4                   5     歩 歩         歩 6 歩 歩     歩 歩 歩 歩   7   角   飛 金   銀 玉   8 香 桂 銀     金   桂 香 9 ☗ pieces in hand: –

In shogi, Fourth File Rook (四間飛車 shikenbisha) is a class of Ranging Rook openings in which the rook is initially positioned on the fourth file if played by White or the sixth file if played by Black.