Challenge: Xiangqi (Chinese Chess) Strategy: The 'Red Cannon Empty' Killing Technique - A Sneaky Killer on the Side - Can you solve it?

The Red Cannon's move to file 3, rank 7, targeting the Black Pawn at file 4, rank 2, is like a sharp blade piercing through the heart. This formation is not just a combination of Cannon and Pawn but also a lesson in the brutality of assassins in military strategy.