"en passant"的定义和意义

What is "en passant"?

En passant is a special chess move that can occur when a pawn moves two squares forward from its starting position and lands next to an opponent’s pawn. In this case, the opponent can capture the pawn as if it had only moved one square forward. The en passant capture must be made immediately after the two-square move, or the right to capture is lost. This rule is in place to prevent a pawn from avoiding capture by advancing too quickly and to keep the game fair by maintaining the strategic balance between pawns.