Left vs right river cannon?

Both pin chariots, but the right cannon (from Black's perspective) attacks the opposite flank, changing the whole battle plan.

Right River Cannon (You Pao Guo He)

马8进7，炮2进4

A Screen Horses variant where Black's right cannon goes to the river to contest space and pressure Red's flank early.

Right River Cannon is more aggressive than the standard Screen Horses. It asks Red to respond accurately or lose the initiative.

Red's 炮二平五 starts the line.

Red rushes 车一平二 to fight for the open file.

Left vs right river cannon?: Both pin chariots, but the right cannon (from Black's perspective) attacks the opposite flank, changing the whole battle plan.

Screen Horses 马8进7，马2进3 Left River Cannon (Zuo Pao Feng Che) 马8进7，马2进3，炮8进4 Central Cannon 炮二平五 Identical Cannons (Shun Pao) 炮二平五，炮8平5