Big blade cuts the heart xiangqi players call 大刀剜心: a Chariot takes the palace-centre Advisor to break the defence. A verified forced line and defences.
Big blade cuts the heart (大刀剜心, dà dāo wān xīn) is a xiangqi mating combination in which a Chariot, backed by other pieces, captures the Advisor on the palace centre. The Chariot is usually given up in the process, but tearing out that central Advisor breaks the defence open and, prepared properly, forces mate.
It is the kind of move that looks like a blunder for exactly one move. The defender has a full palace, Advisors and Elephants connected, and the attacker throws the strongest piece on the board into the middle of it. What makes it work is everything around the Chariot, and that is what this guide is about.
Gouging out the heart
剜 (wān) means to gouge or scoop out with the point of a blade, the way you would cut the core out of an apple. The heart is the palace centre, which Chinese players also call 花心 (huā xīn), the heart of the flower, and the Advisor standing there is the heart of the defence. The Chariot is the big blade. Other names for the same idea are 大胆穿心 (dà dǎn chuān xīn), boldly piercing the heart, and 毒箭穿心, a poisoned arrow through the heart. When a Soldier makes the capture instead of a Chariot, it becomes 小刀剜心, the small knife.
Sources agree on the core: a Chariot takes the central Advisor by force, other pieces cooperate, and mate follows. They differ in emphasis. Some describe it strictly as a Chariot sacrifice; others simply as the Chariot smashing its way into the palace centre. The difference matters in practice, because when the General runs instead of recapturing, the Chariot often survives.
What has to be in place first
The combination is short, but the conditions are strict. A Chariot that captures on the palace centre stands right next to the General, so three questions decide everything.
Can the General capture the Chariot? It must not be able to. Usually a central Cannon sits behind a screen on the central file and guards the palace centre through it. In some versions your own General does the guarding along an open file.
What happens when an Advisor recaptures? The recapturing piece lands on the palace centre. If your central Cannon now pins it there, that Advisor is frozen and cannot drop back to block anything.
Where can the General run? If it can sidestep, you need checks ready to chase it. If it cannot, you only need the second blow. Chinese teaching material is blunt about the alternative: without other pieces cooperating, a Chariot that takes the central Advisor has usually just been thrown away.
The combination, move by move
Set this up with Red at the bottom, reading left and right from Red's side. Black's General is on its home point. One Black Advisor stands on the palace centre and the other on the back corner of the palace on Red's left. One Black Elephant stands on the middle point of the palace's front edge, directly in front of the central Advisor, and the other is on its starting point on Red's right. It looks like a fortress.
Red has a Cannon on the central file at Black's river bank, a Chariot on the right-hand edge of Black's second rank, which is the rank of the palace centre, a second Chariot still in its home corner on Red's left, and its General on the right back corner of its own palace, with that file open all the way up the board.
Nothing quiet works. The second Chariot can run up the edge file to Black's back rank, but the corner Advisor blocks that line, so it is not even check, and the engine finds no mate in one anywhere in the position.
So Red swings the blade. The first Chariot slides along the rank and captures the Advisor on the palace centre, giving check.
Now list every legal reply, because there is only one. The General cannot take the Chariot, since Red's Cannon guards the palace centre by jumping Black's own Elephant. It cannot step right along the back rank, because that point is on the file of Red's General and the two Generals would face each other. Its left side is occupied by the corner Advisor. That leaves the corner Advisor capturing the Chariot, and it is forced.
Red's second Chariot now runs straight up its file to the corner of Black's back rank and checks along it, through the point the Advisor has just left. The General cannot go left along the rank it is being checked on, cannot go right because of the facing Generals, and cannot go forward onto its own Advisor. That Advisor cannot drop back to block, because it is pinned: move it and the central Cannon checks through the Elephant. The Elephant cannot interpose either, since it is the other half of the same pin. Checkmate in two, and XiangqiPlay's rules engine confirms the line for every Black reply.
When the General can run
In many real positions the General is not boxed in on both sides. After the Advisor is taken it steps sideways instead of recapturing, and the attacker needs a follow-up. The standard continuation in Chinese teaching material keeps checking with the Chariot from the General's old home point, guarded by the central Cannon, and brings the second Chariot along a palace rank, driving the General up its rib file until the two Chariots close the net.
That longer chase is worth studying on its own. The principle is what matters here: before you sacrifice, count the General's escape points after each possible reply, and make sure you have a check waiting for every one of them. If one reply leaves you without a check, the blade is not ready.
Defending against the blade
The best defence is to deny the preconditions. The combination relies on the palace centre being guarded, usually by a central Cannon looking through a screen. Put a second piece on the central file, trade the central Cannon, or chase it away, and a Chariot landing on the palace centre can simply be taken by your General.
Mind the General's side points as well. In the example the right-hand point was blocked by the facing Generals, not by any Black piece. A defender who keeps a piece able to cut that file, or who never lets the General's neighbouring points be controlled from a distance, often turns the combination into a lost Chariot for the attacker.
Finally, when an enemy Chariot appears on a rank or file running into your palace centre, check what happens if you are forced to recapture there. A capture on a guarded point is easy to dismiss as impossible, and that is exactly how this mate catches people.
Mistakes that turn a brilliancy into a blunder
Sacrificing without the second blow is the big one. The capture on the palace centre is only half of the combination, so know exactly which piece gives the next check and along which line.
Miscounting the Cannon's screen comes next. After the capture, the central Cannon must have exactly one piece between itself and the palace centre. If your own Soldier is also on the file, the Cannon guards nothing and the General takes the Chariot.
Forgetting the pin is the third. The follow-up in the example worked because the recapturing Advisor was frozen. With a third piece on the central file nothing is pinned, and the Advisor can step back and block. When you have two Chariots, also give the sacrifice to the one whose job is done and keep the one with the open line for the finish.
Sharpening your eye for sacrifices
Combinations like this are learned by seeing them many times. XiangqiPlay's free puzzle library of 5,000 engine-proven mates includes many where the first move gives up material, and a free account lets you try the blade in real games against the computer at any of its eight levels (Easy to God).
XiangqiPlay Team
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