How to Play Cờ Úp (Hidden Xiangqi)

Cờ Úp — "face-down chess," known in Chinese as Jieqi — is a hidden-information twist on Xiangqi (Chinese Chess). It uses the same board and the same pieces, but almost every piece starts face-down, so you don't know what most of your own army is until it moves. Equal parts memory, deduction, and nerve.

What is Cờ Úp?

Cờ Úp is full Xiangqi played on the standard board, nine lines wide and ten long, with the usual sixteen pieces per side. The difference is information: only the two Generals start face-up. The other fifteen pieces on each side — both Chariots, both Horses, both Cannons, both Advisors, both Elephants, and all five Soldiers — are turned face-down and shuffled. The opening looks completely normal, but only the Generals are known to either player. (Don't confuse Cờ Úp with the smaller 4×8 "dark chess," banqi — that's a different game. Cờ Úp is full-board Xiangqi.)

Setting up

Set the board as a normal Xiangqi opening. Then turn every piece except the two Generals face-down, and shuffle each side's fifteen hidden pieces among their own starting points. Every hidden piece now sits on one of the standard opening points, but which piece is under each cover is a mystery — to both players. Red moves first, as usual.

How a face-down piece moves

This is the rule that makes Cờ Úp. A face-down piece does not move by what it secretly is — it moves by the role of the point it sits on. A hidden piece on a Chariot's corner point moves like a Chariot. One on a Horse's point moves like a Horse. One on a Soldier's point steps one point forward like a Soldier. One next to the General, on an Advisor's point, makes the Advisor's single diagonal step and stays inside the palace. Because a hidden piece has never left its starting point, its "disguise" is simply whatever normally begins there.

Revealing a piece

The instant a face-down piece makes its first move, flip it over. It moves that turn by its disguise, then shows its true identity — drawn at random from your remaining hidden pieces — and from then on it moves by that true type. The disguise and the true piece need not match: a piece on a Soldier's point may step one square forward, flip, and turn out to be a Chariot. That's perfectly legal — the move was legal for the Soldier it was pretending to be, and the revealed piece only governs future moves. A piece that never moves is never revealed.

Freed Advisors and Elephants

Cờ Úp's signature twist: once an Advisor or Elephant is revealed, it is set free. A revealed Advisor may leave the palace, and a revealed Elephant may cross the river — both ranging the whole board on their usual step patterns. (A piece still face-down on an Advisor's or Elephant's point keeps the normal restriction until it reveals.) The General, as always, never leaves the palace, and Soldiers still gain their sideways step only after crossing the river.

Captures and hidden pieces

You capture exactly as in Xiangqi — move onto an enemy point along your current movement — and hidden pieces can both capture and be captured. But there's a catch: if you take a piece that was still face-down, it stays hidden. Neither player gets to see what it was. Keeping track of what you've lost and taken, under uncertainty, is part of the skill.

How to win

Winning is the same as in Xiangqi. Checkmate the enemy General — threaten its capture with no escape — and you win. You also win if your opponent has no legal move: as in Xiangqi, stalemate is a loss, not a draw. The flying-general rule applies from the very first move, since the Generals are the only pieces always in view — the two Generals may never face each other on an open file. And because hidden pieces move by their disguise, a check — or even a checkmate — can be delivered by a piece whose true identity nobody knows yet.

A note on strategy

Cờ Úp rewards calculated risk: when to commit a mystery piece, how to read the shrinking pool of pieces you haven't revealed, and when a face-down piece is worth more as a threat than as a known quantity. Players like to say it's "three parts luck, seven parts skill."

Common questions

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