The Five-Seven Cannons

A battery with a blueprint

The system’s geometry is its argument. The fifth-file cannon pins black’s centre as ever; the seventh-file cannon aims through the soldier screen at black’s kingside horse and the palace corner behind it; and the two together create threats neither makes alone - lever the wing soldier forward and the seventh cannon strikes, trade it off and the centre cannon’s file opens. Black’s screen was built to answer one cannon. The second one is the point.

What separates the wuqipao from a mere aggressive setup is how prepared its follow-through is: the edge horse (keeping the cannon’s file clear - the move that looks eccentric and is core), the queenside chariot standoff, the timed soldier levers. The model line walks the full assembly in order; play it through once and the strange moves stop looking strange.

This is the most theory-dependent guide in the library, and the honest advice is to embrace that: the system rewards preparation precisely because both sides’ best moves are known and narrow. If you want an attack you can wing, play the Palace-Corner Cannon; if you want one that professionals still fear, learn this one properly.

Mid-century steel

The Five-Seven Cannons is the child of organised theory: as national competition systematised in the mid-twentieth century and the Screen Horses hardened into black’s standard wall, red’s laboratories - clubs, teams, the new professional class - converged on the twin-cannon battery as the critical test. Generations of analysts filled its variations in like a crossword, and by the archive’s era it had become what it remains: the main line’s main line.

Its championship pedigree is unmatched among attacking systems - the archive’s great match players wielded it and met it constantly, and some of the collection’s most famous attacking games are wuqipao storms breaking through, or being heroically held. When commentators say a Screen Horses player 'passed the exam', this opening is usually the exam.

The model line, move by move

The first six steps are the classical centre-cannon channel; the system announces itself at step seven when the second cannon slides to the seventh file, and the next three moves assemble the full machine - edge horse, chariot standoff. Black, no fool, spends the same moves preparing the standard counter: the queenside cannon crossing the river at step twelve, the move theory considers black’s best.

Treat the walkthrough as a tour of the assembled battery rather than a finished fight - the real war starts two moves after it ends, and the plans section maps it.

The ideas underneath

The battery’s threats are conditional, and that is their strength: the seventh cannon’s strike works when the wing soldier lever opens the line; the centre cannon’s file opens when black’s screen horse is deflected; each threat’s precondition is something red can play toward. Reading a wuqipao position means listing which conditions are one move from true - for both players.

The edge horse teaches the system’s deepest lesson: in a battery attack, lines matter more than pieces. A horse on its 'good' square that blocks the cannon’s file is a bad piece here; the same horse on the rim, keeping the file clean and covering the battery’s flank, is doing the attack’s load-bearing work. Every wuqipao middlegame decision comes back to line management.

Black’s river-crossing cannon is not a nuisance but the system’s other half: it pressures red’s soldiers laterally and threatens to trade itself for lasting structural damage, and red’s attack must outpace that erosion. The whole opening is a race with published split times - which is why its players study, and its results reward the studying.

Plans for both sides

Red’s assembled machine has a standard firing order: the wing soldier lever to open the seventh cannon’s line of attack, the kingside chariot joining behind the lever, and the centre cannon’s pin cashed at the moment black’s defenders commit. When black’s defence holds the wing, red’s fallback is structural: trade the seventh cannon for a screen horse at the right moment and grind the resulting better-coordinated middlegame.

Black’s counterplay runs on the crossed cannon and the queenside files: pressure red’s soldier line laterally, open the queenside with the soldier levers black prepared, and force red to spend attacking tempi on defence. Theory’s verdict, refined over decades, is balance on best play - which in human games means the better-prepared attacker usually wins the argument.

The move-ten diagram is the system’s textbook plate: battery assembled, standoff set, black’s counter loaded. Most of this opening’s named variations begin within two moves of this exact position - it is worth knowing cold.

How the machine breaks

Firing the battery unassembled. The seventh cannon’s strike before the lever and support arrive wins a soldier and loses the attack - black consolidates, and red holds a scattered army against a counterattack with a schedule. The system’s power is the volley; impatience refunds it.

Mishandling the edge horse. Both errors are common: developing it centrally out of habit (blocking the battery - see the tip), or forgetting it defends as well as clears, and letting black’s crossed cannon harvest the wing it was guarding. The rim horse is the machine’s most misunderstood part; give it the respect the factory manual does.

From black’s chair: passing the opening’s exam and failing its arithmetic - defending the kingside accurately while never starting the queenside counter. Against an assembled wuqipao, pure defence loses on schedule; the crossed cannon and the queenside levers are not optional extras but the defence itself.

Making it yours

This is the library’s most study-rewarding system: run the Five-Seven Cannons lesson on Xiangqi Arena until the assembly order is reflex, then study before playing - the archive’s wuqipao games, filtered by result, are a complete course in both the storm and the seawall.

Play it in serious games only after the drills; blitz teaches this system’s rhythm but punishes half-known theory brutally. And learn black’s side too - facing your own weapon is the fastest way to understand what it actually threatens.