Jieqi strategy: reveal pieces, read the odds and play with a plan

What is Jieqi?

Jieqi (揭棋), also called hidden Xiangqi and listed as Hidden chess on ChessPlayX, is a Xiangqi variant. The 9 × 10 board, the river, the palaces and the generals are unchanged. The difference is the setup: each side still has 16 pieces, but only the general starts face up. The other fifteen are shuffled and placed face down on the fifteen familiar starting points.

In other words, you know where every hidden piece stands, but not what it really is. On ChessPlayX, the server shuffles the pieces with a cryptographically secure random number generator and never sends the identity of an unrevealed piece to either player or to spectators. The full rules are in the Jieqi rules guide.

Fake pieces and real pieces

Get this idea straight before thinking about strategy. While a piece is face down, its first move is decided by its starting point. Players call these the fake chariot, fake horse, fake cannon, fake advisor, fake elephant and fake soldier.

• A hidden piece on a chariot point makes its first move like a chariot.
• A hidden piece on a horse point moves like a horse and can still be blocked at the horse leg.
• A hidden piece on a cannon point moves like a cannon: it slides along a line without a screen, but needs exactly one screen to capture.
• A hidden piece on an advisor point moves only diagonally inside the palace; one on an elephant point moves two points diagonally, cannot cross the river and is still blocked at the elephant eye.
• A hidden piece on a soldier point can only step one point straight forward.

The name "fake chariot" describes only how the first move works; it says nothing about the real piece. A fake chariot can turn out to be a soldier, and a fake soldier can turn out to be a chariot. With a random shuffle, every hidden piece starts with the same probability distribution shown in the table above.

How does a reveal work?

1. Choose a face-down piece and make a legal move for the role of its starting point, including a capture.
2. As soon as it reaches its destination, the piece is turned over and its real identity is shown.
3. From the next turn on, it moves and captures as its real piece; the ability to "move like its old point" is gone.

Example: a hidden piece on a horse point jumps out like a horse and is revealed as a cannon. From its next move it is a genuine cannon and needs a screen to capture.

Two details are easy to miss. First, while a piece is face down, it controls points and gives check according to the role of its starting point, not its real identity: a fake cannon with a screen is still giving check. Second, on ChessPlayX, a piece captured while face down stays hidden from both sides, including its owner. That has a direct effect on the piece counting covered below.

Advisors and elephants after the reveal

In Xiangqi, advisors never leave the palace and elephants never cross the river. In Jieqi, once revealed, both limits are lifted: an advisor moves one point diagonally anywhere on the board, and an elephant moves two points diagonally and may cross the river, though it is still blocked by a piece on the elephant eye. The general must still stay in the palace.

That means revealed advisors and elephants are no longer purely defensive pieces. An elephant revealed near the river can join an attack; an advisor revealed on a wing can block a line or pick off a soldier. Don't treat turning up an advisor or elephant as a "wasted move".

Don't reveal a piece just because you can

The most common beginner mistake is "it's face down, so let's flip it and see". Every reveal is a strategic decision. Before you reveal, answer three questions:

1. What does this reveal gain right now?
2. If the piece turns out to be the worst case, can the position cope?
3. If I leave it hidden, what is it guarding or threatening?

An unrevealed piece is sometimes valuable precisely because your opponent does not know what it is or where its first move will go.

Judge both the piece and the landing point

Don't score a reveal as simply "chariot good, soldier bad". A chariot revealed on a point where it is trapped or can be taken at once may be useless; a horse revealed in the centre, protected and threatening an enemy piece, can be very strong. Judge it by the formula: which piece + where it appears + what it threatens + how your opponent can reply.

That leads to the "landing point" principle: don't just ask which piece you want to reveal, ask where you want it to appear. The same hidden horse jumping to a protected point near the centre is a very different move from one jumping to the edge, where it is easy to capture.

Save fake chariots for when they matter

The two hidden pieces on chariot points have a special asset: their first move can travel a long way along a rank or file. That is a resource. Revealing a fake chariot early without a purpose spends your chance to switch wings, break a bind or strike from a distance at a more important moment. In many positions, keeping a fake chariot hidden gives you a defensive or counterattacking move your opponent will struggle to see coming.

A fake cannon needs a screen and a safe destination

A fake cannon's first move uses cannon mechanics, so with the right screen it can capture, pressure the general or force your opponent onto the defensive. Before using it, check: is there a useful screen, is the destination safe, can it keep attacking if it turns out to be a chariot, horse or cannon, and is it still useful there if it turns out to be a soldier, advisor or elephant?

A fake soldier is a cheap probe

A fake soldier can only step forward one point, but that is exactly why it is the reveal that disturbs your setup the least. If it is a chariot, you instantly have a chariot on an advanced point; a cannon or horse can join the fight quickly; an advisor or elephant gives you another fighting piece; a soldier simply carries on as a soldier. Still, a 2/15 chance of a chariot is no reason to open soldiers just to "hunt for a chariot" — the reveal still has to make positional sense.

How to calculate what is under a hidden piece

The odds do not stay fixed at 2/15 or 5/15. Every time another piece becomes known, recalculate:

On ChessPlayX, "unknown" includes both the hidden pieces still on the board and the pieces captured while face down, because those captured pieces are never revealed. Leave them out and you will overestimate the chance that a remaining hidden piece is a strong one.

A middlegame example

You have revealed 1 chariot, 1 cannon, 2 horses and 2 soldiers, and none of your hidden pieces has been captured. Six pieces are known, and nine are still unknown:

That is why strong players always keep track of what has come out: not to show off their memory, but to narrow down what the remaining hidden pieces can be. If you have revealed ten pieces without seeing a chariot and none of your hidden pieces has been captured, the last five still contain both chariots, so each has a 2/5 = 40% chance of being a chariot — three times the starting odds.

Revealing your first three pieces

If you reveal three different hidden pieces with no information yet (2 chariots among 15 pieces):

• At least one chariot: 1 − C(13,3)/C(15,3) ≈ 37.14%.
• At least one chariot or cannon (4 pieces): ≈ 63.74%.
• At least one chariot, cannon or horse (6 pieces): ≈ 81.54%.

Any single hidden piece has a 6/15 = 40% chance of being a chariot, cannon or horse. But that is only the chance of an identity, not the chance of a good reveal: the real value still depends on the point where the piece appears.

Count your opponent's pieces too

Probability helps on defence as well. If your opponent has already revealed both chariots, both cannons and one horse, their remaining hidden pieces cannot be a chariot or cannon and include at most one horse. On the other hand, if they have not shown a chariot and only a few hidden pieces remain, every reveal they prepare near your general deserves a much closer look.

Managing risk when you reveal

Before revealing, picture three scenarios:

• Good: it is a chariot, cannon or horse and creates pressure.
• Average: it is an advisor or elephant, but the piece is still useful where it stands.
• Bad: it is a soldier, or the newly revealed piece is captured at once and cannot be saved.

If all three outcomes are acceptable, it is usually a high-quality reveal. Turning up a chariot on a point where it is about to be captured is not good news.

Likewise, don't get greedy with your opponent's hidden pieces on the theory that "it might be a chariot, so take it". That thinking easily costs you the initiative, wrecks your defence, drags a chariot too deep or trades a strong piece for one of unknown value. Judge your opponent's hidden pieces by their expected value, not the best-case scenario — and remember that on ChessPlayX you will not find out what you just captured.

A plan for each phase of the game

Opening — reveal with a purpose. The goal is not to reveal as much as possible but to fight for the initiative, develop your pieces, keep your general safe, avoid spending fake chariots or fake cannons too early and watch which pieces your opponent has shown. Prefer reveals that still help across most of the possible outcomes.

Middlegame — information starts to pay. Once about half the pieces are known, counting becomes very useful. Keep updating how many chariots, cannons, horses and soldiers each side has left. This is also when chariots, cannons and horses, together with revealed advisors and elephants, can combine in attacks that look very different from standard Xiangqi. Central control still matters: a piece revealed near the centre has more options and is harder to neutralise than one on the edge.

Endgame — back to calculation. Once nearly every hidden piece has been revealed, the hidden information shrinks sharply and the game looks much like Xiangqi: calculating variations, coordinating pieces, controlling lines, protecting the general and converting an advantage into a win. A solid grasp of the Xiangqi rules still matters a great deal.

Five common beginner mistakes

1. Revealing nonstop. Knowing all of your pieces is not automatically an advantage; an unrevealed piece is sometimes an asset.
2. Only hoping for chariots. The goal is a winning position, not a chariot collection.
3. Not counting pieces. Ignoring the pieces that have appeared means ignoring the most valuable source of information in Jieqi.
4. Underrating advisors and elephants. Once revealed, they can leave the palace and cross the river, becoming real fighting pieces.
5. Looking only at the piece just revealed. A good move accounts for the point where it appears, the pieces protecting it, your opponent's reply and the safety of your general.

How to practise Jieqi effectively

After each game, review three kinds of decisions. For reveals: "Did I reveal because of a plan or out of curiosity?" For moments that called for probability: "Which pieces had not yet appeared at that point?" For pieces you lost: "Did I lose it to an unlucky reveal or by choosing the wrong point to reveal on?" Asking these questions will help you improve much faster than concluding "I was just unlucky". You can play Jieqi on ChessPlayX and put these ideas to work right away.

Frequently asked questions

Conclusion

To play Jieqi well, don't just ask "what is this hidden piece?" Ask "if I reveal it now, will most of the possible outcomes improve my position?" That is the difference between playing on luck and managing uncertainty. Strong Jieqi players combine four skills: a solid Xiangqi foundation, revealing the right piece at the right time on the right point, memory and probability, and risk management. The better you play, the less luck you need to make a good decision.

Note: Jieqi can vary slightly between platforms, clubs and tournaments, especially in how captured hidden pieces and repetition are handled. In competition, follow the rules published by the room or the organisers.

Sources and further reading

• Chinese Wikipedia: 揭棋: the face-down setup, the reveal rules and revealed advisors and elephants crossing the river.
• ChessPlayX Jieqi rules guide: the platform's conventions (version coup.vietnam@1) for reveals, captured hidden pieces, check and draws.
• Read more about the Xiangqi rules and chess vs Xiangqi.