How do you defend against the two-chariot mate (雙車錯)?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws for movement, checkmate and both repetition rulings: a side that forces a repetition by perpetual check or perpetual chase loses rather than drawing. The chase half has not been validated against the official casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it before publishing.
Direct answer
The two-chariot mate works because each chariot checks along one line while the other controls the next, so the general runs out of room. Defend by stopping the second chariot from arriving, keeping a piece able to block the lines next to your general, trading one chariot whenever you can, and, when your own attack is close, answering with checks of your own.
How the attack works
In 雙車錯 one chariot checks the general along a file or rank, the general steps to the neighbouring line, and the second chariot checks it there while the first still covers the line it left. Because both lines stay controlled, the general is driven to the edge of the palace and mated. See what 雙車錯 is.
Stop the second chariot
One enemy chariot near your palace is a nuisance; two are a mating threat. The moment one chariot has arrived, look at the files and ranks the other could use to join it, and put a piece on that route or keep a piece ready to challenge it. Your own chariot is often the best guard, since it can oppose an enemy chariot on the same line.
Keep blockers and room
Chariot checks can be blocked, unlike horse checks. Advisors and elephants that can step onto the line between a chariot and your general are valuable, which is why losing advisors makes chariot attacks so dangerous. Keep at least one escape point for your general that does not lie on a line a chariot already controls.
Trade or counter-attack
A single chariot rarely mates a defended general by itself, so exchanging one of the two is often enough to end the danger, even at a small material cost. If you cannot trade, look for checks: every check you give is a move the attacker spends answering instead of bringing the second chariot in. Be careful with endless checks, though: under the rules the side giving perpetual check must break it off or lose. See perpetual check and chase.
Related questions
Why is 雙車錯 so common?
Chariots are the most mobile pieces, and two of them control two whole lines at once. Once both reach the palace area, many attacks finish this way.
Is two chariots against a full defence a win?
Two chariots are an overwhelming attacking force against a bare general. Against defenders the details matter, which is why prevention is the best defence.
.