Queens Pawn Game Modern Defense Interference in Chess

In the Queens Pawn Game Modern Defense, “Interference” is a tactical motif where one piece blocks or disrupts a line (often a diagonal, file, or rank) so an attacker’s plan suddenly changes. A defining feature is the Modern Defense setup around the queenside pawn structure and piece placement after the queenside pawn moves typical of the Queens Pawn Game. The interference often appears when a defender’s piece must guard a critical square or line, and a move forces that guard to be displaced or blocked.