Queens Pawn Game Colle System Discovered Check in Chess

In the queens pawn game colle system discovered check, White’s Colle-style setup (typically pawns on d4 and e3 with the c-pawn supporting) creates a line piece that can “reveal” an attack. The defining feature is that a move or pawn break opens a line so that a different piece gives check—often after a piece on the same line moves away or a pawn advances to uncover the attacker.