Chess Dictionary — O

Terms starting with O (4)

Open File Intermediate

An open file is a vertical column with no pawns on it, allowing rooks and queens to move freely along its entire length.

Opening Beginner

The opening is the first phase of a chess game, usually the first 10–15 moves, in which players develop their pieces, fight for central control, and prepare their king’s safety.

Opposition Intermediate

Opposition occurs when two kings face each other on the same rank or file with one square between them, so that the player whose turn it is to move must give way and allow the opponent’s king to advance.

Outpost Intermediate

An outpost is a square, typically advanced in the opponent's half of the board, that cannot be attacked by an enemy pawn and is therefore a secure base for a piece, usually a knight, often protected by one of your own pawns.