How do you defend a worse endgame with just a horse against an enemy chariot?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
As the defending side with only a horse against a chariot, aim to keep the horse on central squares where it has the most mobility and is hardest for the chariot to trap, and stay alert for any moment the enemy chariot and general end up a knight's move apart, which is your one realistic chance to change the outcome with a fork.
Why central squares matter so much for the defending horse
A horse pushed to the edge of the board loses half its potential moves and becomes far easier for the chariot to corner and eventually win. Central squares keep more escape routes available and buy more time, even though the position remains lost with accurate play from the stronger side.
What realistic practical chances actually look like
This endgame is lost with correct technique, so the honest goal for the defender is making the win as difficult as possible and watching constantly for any careless placement of the enemy general that allows a fork. It will not usually save the game against a strong opponent, but it is far from an automatic loss against an inaccurate one.
Related questions
Should I trade the horse for a soldier to simplify further?
No, trading away your only piece leaves nothing to create practical chances with; keep it on the board as long as possible.
Is there any way to force a draw here with perfect defence?
Not against accurate play from a chariot; the position is a known win for the stronger side.