Can two advisors and just one elephant hold off a lone chariot?
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
It is not proven either way, so do not count on it. The two neighbouring cases are clear: with both elephants gone, a lone chariot beats two advisors in every one of 125,118 positions, and with both elephants on, the manuals call it a draw. Two advisors and one elephant sit between them, unsolved here, so the result turns on the position, above all on which flank the remaining elephant covers.
Why the advisors are not enough on their own
Advisors cover the central palace points a chariot would otherwise use to deliver check from close range, but that is not a defence by itself: against a lone chariot, two advisors with no elephants lose every position, and the advisors are part of the reason, because they occupy points the general would otherwise step to. The remaining elephant is doing real work, not decoration.
Where the missing elephant actually costs something
Elephants defend key points outside the palace and block certain approach squares a chariot would otherwise use freely. With only one elephant left, the side of the board that elephant does not cover becomes more accessible, and a chariot supported by anything else, even a single soldier, has more ways to exploit that gap. See advisors and elephants for the general defensive principles this depends on.
Related questions
Is losing one elephant always dangerous?
Not always, it depends heavily on which side of the board the surviving elephant covers relative to where the chariot is operating.
Does it matter which elephant was lost?
Yes, since the two elephants cover different points; which one remains determines which flank stays properly defended.