How do you checkmate with a cannon and an advisor?
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
Keep the advisor in your own palace as the cannon's screen, then check up the file it stands on. An advisor never leaves its palace, so the mate runs along one of the palace's three files, with the cannon behind the advisor and your own general holding the file next to it. Cannon and advisor is one of the material combinations that forces mate against a bare general, but the cannon alone cannot check without a screen.
The advisor stays at home
An advisor never leaves its own palace, so it cannot walk forward to help. What it can do is stand on one of the palace's three files and serve as a screen: a cannon behind it on that file checks the enemy general straight through it. Choose the file first and put the advisor on it; the mate does not begin until it is there.
Delivering the mate
Once the advisor sits on the file you want, the cannon checks through it. Use your own general to deny the escape file, exactly as in a lone chariot mate, since the cannon alone still only covers one line at a time.
Related questions
Is this mate harder than a chariot mate?
A little, because the advisor needs setting up first, but it follows the same basic logic once in place.
Can the bare general capture the advisor?
No. The enemy general never leaves its own palace and your advisor never leaves yours, so against a bare general the screen is never at risk.
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