Queens Pawn Game Colle System Double Check in Chess

In the queens pawn game colle system, a “double check” is a tactical moment where one move gives check to the enemy king twice at once—typically by combining a direct line piece check with a second check from another piece. In this family, the defining feature is the Colle-style setup (often with pawns on d4/e3 and pieces developing to support central control), which can open lines for rooks, bishops, or queens to coordinate checks.