Challenge: '**The Roaring Cannon - Black's Defensive Formation, Red Must Strike at the Golden Moment**': "Breakthrough Tactics with the Chariot's Thrust & Horse's River Crossing (Level 6/10)" - Can you solve it?

**This formation is a battlefield epic written in blood and wood.** Black has built a three-line fortress (Elephant on file 3, General on file 5, Advisor on file 6), like the ancient Bạch Đằng citadel, but left a critical weakness: "**two Advisors stand side by side (files 9 and 8) like unsecured iron gates.** Red holds the initiative with **Chariot on file 8, Cannon on file 8, and Horse on file 4**, but if they don't strike at the golden moment (before Black can retreat the Elephant to the center), they'll face *'Cannons without ammo, Chariots without paths'* like Qin's defeat at Hạ Lương. **Core Lesson:** - **The opening move must be 'Horse's River Crossing' (Horse on file 4 moves to file 6) or 'Cannon's Divine Descent' (Cannon on file 8 advances to file 5 to attack Black's General).** - **If Black retreats the Elephant to the center (Elephant on file 5 moves to file 4), the formation becomes 'Crossed Horses' – a deadly trap.** - **Red's Chariot on file 8 must 'thrust through' Black's rear ranks (advances into the gap between Advisor and Elephant) before Black counters.**