Queens Pawn Game Colle System Trapped Piece Chess Puzzles

In the Queens Pawn Game Colle System, a trapped piece usually means Black has developed a bishop or knight to an active-looking square, only to find it cut off by the Colle structure. The defining setup is White’s pawns on d4, e3, and c3, with the bishop often coming to d3 and the e-file or c-file used to limit escape squares. When the opponent’s piece loses retreat squares, the position becomes a classic trapped-piece motif rather than a direct tactical sacrifice.