File
A file is one of the eight vertical columns of the chessboard, labeled a to h from White’s left to right, and a key line along which rooks, queens and pawn structures operate.
Files run from one player's side of the board to the other. They are lettered a through h, starting from White's left. The e-file, for example, is the column containing the squares e1 to e8, and the central files are d and e.
Files are the highways of the rook and the queen. An open file has no pawns of either side on it, and a half-open file holds pawns of only one color, which makes it half-open for the side with no pawn there. A rook placed on an open file can invade the seventh or eighth rank, so fights for open files are a standard middlegame theme.
Pawn structure is described by files too. Doubled pawns sit on one file, an isolated pawn has no friendly pawns on the adjacent files, and a passed pawn has no enemy pawns in front of it on its own or neighboring files. A pawn majority is counted on one wing, such as the queenside files a to c.
How to use this: when a file opens, double rooks on it if you can, and check which entry squares you control. When you must defend an open file, contest it with your own rook or cover the entry square.
Mistake to avoid: confusing files with ranks. Files are letters and run vertically, ranks are numbers and run horizontally.
Tip: before each middlegame move, glance at the files and ask which one is open, which one will open next, and who controls it.
Also worth reading is Chessboard. The chessboard is the playing field for every game of chess, a large square divided into eight rows and eight columns of light and dark cells that alternate, set so the corner nearest each player's right hand is light.
It sits close to Rank. A rank is any of the eight horizontal rows of the chessboard; FIDE numbers them 1 to 8 beginning on White's side, and rooks and queens slide along them while pawns climb from one rank to the next.
Once "File" is familiar, the next question is what to work on at your rating, which the improvement plans by rating band answer with game and puzzle data.
Related terms
A rank is any of the eight horizontal rows of the chessboard; FIDE numbers them 1 to 8 beginning on White's side, and rooks and queens slide along them while pawns climb from one rank to the next.
An open file is a vertical column of the board with no pawns of either color on it, which gives rooks and queens a clear path to invade the opponent's position.
A half-open file is a file on which one side has no pawn while the opponent still does, giving the side without a pawn a line along which to attack the enemy pawn.
Coordinates are the letters a to h along the files and the numbers 1 to 8 along the ranks that give every square of the chessboard a unique name, such as c3 or g7.
The chessboard is the playing field for every game of chess, a large square divided into eight rows and eight columns of light and dark cells that alternate, set so the corner nearest each player's right hand is light.
The seventh rank is the rank where the opponent's pawns usually start, so a rook placed there attacks those pawns from the side and keeps the enemy king confined to its back rank.
Guides that go further
What to decide first, the questions to ask, what a first lesson should show and the red flags to avoid.
How much does chess coaching cost?
Published rates for private, group and subscription chess coaching, with the source and the date of each.
A game review, a read on your level and a written study plan from George Li.
Sources
- FIDE Laws of Chess (taking effect from 1 January 2023), Article 2.4, read Oct 21, 2026.
- FIDE Laws of Chess (taking effect from 1 January 2023), Appendix C.5, read Oct 21, 2026.
- FIDE Laws of Chess (taking effect from 1 January 2023), Article 3.3, read Oct 21, 2026.
Want to spot this in your own games?
A first lesson starts with your games: George reviews them and builds a study plan around what he finds.