Let your Rook "walk" along the third or sixth row!

We know that rooks need open files. But sometimes it is more effective to let them walk sideways.

Example 1:

Example 2:

Example 3:

Example 4:

Example 1-3 are taken from "Techniques of positional play"( in German language) by Bronznik/Terekhin and example 4 from "Pawn Sacrifice!" by Taylor

If you want to read more about a similiar theme:

http://www.chess.com/blog/mauerblume/a-rook-on-the-secondseventh-row-can-a-mighty-piece