Colle System En Passant in Chess

“Colle System En Passant” refers to the tactical moment in a Colle System structure where an en passant capture becomes available after a pawn advances two squares. In many Colle setups, the defining feature is the central/queenside pawn tension that can arise around the c- and d-pawns, often after Black plays ...c5 (or ...d5) to challenge the center. If White has a pawn positioned to capture en passant on the very next move, the motif can win tempo, open lines, or remove a key defender.