File: a practical example
The e-file contains e1 through e8. A rook can travel along it when no intervening piece blocks the route. If neither side has a pawn on that file, it is an open file; if only the opponent has a pawn there, it is semi-open for you.
How to use the idea in your games
When placing a rook, examine both the file and the squares at its far end. Access to an entry square can matter more than simply occupying an empty column.
A useful study question
Can you explain file in your own words, identify it in a position, and describe when the idea does not apply? Test the explanation on a legal board before relying on it.
Connect the ideas
Open file, Semi-open file, Rook are useful next concepts. Follow the links to compare definitions and examples, then return to the complete chess glossary whenever an unfamiliar term appears.
Sources & further reading
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