Challenge: The 'Empty Cannon' Trap in Xiangqi: Red's Strategic Advantage - Can you solve it?

When the Red Chariot is on file 4, rank 7 and the Red Horse is on file 3, rank 7, the Black Cannon on file 7, rank 8 is 'empty,' creating an opportunity for the Red Pawn on file 5, rank 6 to 'pierce' into the Black General. Warning: If not prevented, the Black Chariot on file 2, rank 4 will be 'surrounded and killed.'