Interference is a chess tactic that involves using a piece or pawn to block or restrict the movement of an opposing piece or pawn. This can be done by placing the piece or pawn directly in the way of the opposing piece or pawn, or by creating a line of attack that forces the opposing piece or pawn to move in a certain way. Interference can be used to create a positional advantage, to restrict the mobility of the opposing pieces or to generate a tactical opportunity.
One of the most common examples of interference is the move d5 in the Sicilian Defense, which creates a pawn chain that restricts the movement of the opposing pieces. Another common example is the move d4 in the Queen's Gambit, which creates a pawn chain that restricts the movement of the opposing pieces. This move also aims to control the center and to create a strong pawn structure.
Interference can also be used to restrict the mobility of the opponent's pieces by creating a line of attack that forces the opponent's pieces to move in a certain way. This can be done by attacking a key square or a valuable piece, forcing the opponent to move the piece or to lose it.
To prevent interference, players should be aware of the potential threats that their opponent can make and try to anticipate the opponent's moves. They should also try to keep their pieces active and try to control the key squares on the board.