Challenge: The 'Black Rook on File 4' Trap - Red's Secret in the 15c6 Position - Can you solve it?

Detailed analysis of the Xiangqi (Chinese Chess) position where the Black Rook on File 4 sets a trap, with Red's Horse on File 6 and Red's Pawn on File 5 combining to create pressure. Understand Red's critical moves and effective defensive strategies from Black's perspective.