Challenge: Free Xiangqi: Red Horse Reveals 4th Rank 9 - Black's Defensive Strategy Against Rook and Cannon - Can you solve it?

Analyze the position when the Red Horse reveals on the 4th rank of the 9th file and the Red Pawn reveals on the 3rd rank of the 9th file, engaging with Black's Rook on the 7th rank of the 3rd file and Black's Cannon on the 7th rank of the 8th file. Black must exploit the 'hidden pawn' opportunity to reverse the situation.