Open file

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Image:chess zhor 26.png
Image:chess zver 26.png a8 b8 c8 d8 e8 xo f8 g8 h8 Image:chess zver 26.png
a7 pd b7 pd c7 pd d7 pd e7 xx f7 pd g7 pd h7 pd
a6 b6 c6 d6 e6 xx f6 g6 h6
a5 b5 c5 d5 e5 xx f5 g5 h5
a4 b4 c4 d4 e4 xx f4 g4 h4
a3 b3 c3 d3 e3 xx f3 g3 h3
a2 pl b2 pl c2 pl d2 pl e2 xx f2 pl g2 pl h2 pl
a1 b1 c1 d1 e1 xo f1 g1 h1
Image:chess zhor 26.png
The e file (marked with crosses) is an open file since there are no pawns on it. Rooks can go on the dotted squares.

An open file in chess is a file with no pawns of either color on it. In the diagram, the e-file is an open file. An open file can provide a line of attack for a rook or queen. Having rooks and/or queens on open files and/or half-open files is considered an advantage as it allows one to attack more easily, as the rook or queen can go down the file and penetrate the opposing position. The objective of a rook or queen on an open file is to reach the seventh or eighth rank for White and first or second for Black. Controlling the seventh rank is generally worth at least a pawn, as most of the opposing pawns reside there. Many games are decided based on this strategy.

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