Open file

A common strategic objective for a rook or queen on an open file is to reach its seventh or eighth rank (the opponent's second or first rank). Controlling the seventh rank is generally worth at least a pawn, as it threatens all the opponent's yet-unmoved pawns to some degree. Controlling the eighth rank is likely to force the opposing king into a more exposed position and puts pressure on any remaining undeveloped pieces, or if the rank is already clear, allows unobstructed movement behind the enemy forces. Aron Nimzowitsch first recognized the power of a major piece on an open file, writing in his famous book My System that the main objective of a rook or queen on an open file is "the eventual occupation of the 7th or 8th rank".

Many games are decided based on this strategy. In the game Anand, Ivanchuk, Amber 2001, Anand sacrificed a pawn to open the d-file, where his rooks had previously formed a battery. White then used the open file to deploy his rooks to the seventh and eighth ranks and win the game, by exploiting the weakness of Black's a-pawn. White's dominance on the d-file allowed him to maneuver his rooks to aggressive posts deep within Black's defense.