The blocked horse

One rule, and three things it does that a chess player does not expect
Updated 21 September 2026

A xiangqi horse moves like a chess knight, with one difference: it does not jump. It steps one point straight, then one point diagonally outward, and if the point it steps through — its leg — is occupied, that move does not exist. Chinese players call putting a piece there 蹩馬腿, "hobbling the horse's leg". The rule itself is on the rules page. This page is about what follows from it.

Where the leg is

Every horse move is two points in one direction and one point in the other. The leg is always the point one step along the long direction, right next to the horse. A horse has four legs — the four points touching it orthogonally — and each one serves two of its eight possible moves. Fill one leg and two moves disappear; fill all four and the horse cannot move at all.

Two consequences are worth saying out loud. The leg is next to the horse, never next to its target, so what blocks a horse is decided by what stands beside it. And a piece of either colour blocks it: your own soldier on your horse's leg shuts that move off exactly as well as an enemy one.

It only works one way

In chess, if a knight attacks a knight, the second knight attacks the first. The move is symmetrical. In xiangqi it is not, because the two horses have different legs.

Red horse on e5, black horse on d3, red soldier on d4. The red horse's leg toward d3 is e4, which is empty, so it attacks the black horse (ringed). The black horse's leg toward e5 is d4, where the soldier stands, so it cannot answer — and the same soldier also blocks its move to c5 (crossed). It still has six moves, but neither of the two that pass through d4.

This is the most useful thing to know about the horse. When your horse and an enemy horse are a horse's move apart, look at both legs before assuming it is an even trade. One side may be able to take, and the other may only be able to watch.

A horse's check can be blocked

A chess player knows three answers to check — move the king, capture the checking piece, or put something in the way — and knows that the third never works against a knight. Against a xiangqi horse it does. The "way" is the leg.

The red horse on d2 checks the black general on e0 through its leg at d1 (gold). Black has four legal replies: three general moves, and the chariot sliding from g1 to d1. That last one answers the check without moving the general and without capturing anything — it simply stands on the leg.

So when a horse checks you, the third answer is back: as well as asking whether the general can move and whether the horse can be taken, ask whether anything can reach the horse's leg in one move. A blocker on the leg keeps the general where it is and gives nothing away.

A horse can be trapped

Because four pieces — or fewer, near the edge — are enough to take every move away, a horse can end up with nowhere to go at all, even while nothing is attacking it. A chess knight can only be stopped at the squares it lands on; a xiangqi horse can be stopped on the way, by pieces that are not on any square it wants.

A red horse on a1, deep in Black's camp. Of the three points beside it, a0 leads only off the board, so just two of its legs lead anywhere — and Black occupies both: the elephant on a2 and the horse on b1. Its three possible moves (crossed) are all gone, so it has no legal move at all — though neither black piece attacks it. It is out of the game until one of them moves.

A horse that has gone deep into the enemy camp is exactly where this happens, because the corner and the edge give it fewer legs to lose. Before sending a horse in, ask how it gets out.

What to do with it in a game

When an enemy horse is threatening something, look at its leg first. A piece placed there removes the threat without trading anything, and often does something useful where it lands.

Keep your own horses' legs clear. The most common way a horse is blocked is by its own side — a soldier, an elephant or a cannon parked beside it. It costs nothing to notice, and a horse with its legs free simply has more moves than one without.

The elephant has the same weakness. It moves two points diagonally and is blocked by a piece on the point in between, called the elephant's eye. If you have learned to read a horse's legs, you have already learned to read an elephant's eye.