Challenge: Black Rook Defense Trick: "When the Red General Exposes 4-9 – Victory Like the Battle of Bạch Đằng" - Can you solve it?

This is a **classic chess problem** about countering pressure from rook thrusts, knight threats, and exposed generals. From Black's (defensive) perspective, we apply the **"Wu Zhong Co Truc" Strategy** (not allowing the opponent to control the center) and the **"Dai Binh Quan" Strategy** (countering with a large formation) to turn a losing position into a winning one. Learn how to use **rook coordination**, maintain central control, and wait for the right moment to counterattack like Zhang Han Si waited for the enemy to grow weary at Bạch Đằng.