Challenge: Defensive Counterattack in the 'Chariot Thrust' Formation - The Black Chariot's Secret - Can you solve it?

When the Red Chariot on file 9 advances directly, the Black Chariot on file 3 must decide: Retreat or Advance? In this formation, there is only one way to reverse the situation, and that is when the Red Cannon on file 1 'blocks the gap' before the Red Chariot delivers a decisive strike.