Get trained
This page explains the principles. It is not a substitute for lessons from a qualified polo instructor or club, and it does not replace the rules of your governing body, club or tournament.
What the line of the ball is
The HPA's 2026 rules (Rule 27) define the line of the ball as the extended path the ball has travelled or is travelling, including after it has been deflected. It is the reference umpires use to decide which player has precedence, meaning the right to play the ball ahead of everyone else.
The USPA's 2024 Outdoor Rules (Rule 23) define it as the ball's course, or that line extended forward or backward. They add a special case: when a dead ball is put into play by being hit at and missed, the line is the direction the player was riding. The HPA's Rule 27 says the same of a free hit that is missed.
Two rulebooks, two framings
The two bodies describe the same safety idea with a different central term, and it helps to know which you are reading.
- HPA 2026 builds precedence around the line of the ball (Rule 27), with a separate right of way for the player in possession (Rule 28).
- USPA 2024 makes the Right of Way the central concept (Rule 24). Between players near the ball there is always a Right of Way, extending ahead of the entitled player in the direction they are riding. The USPA says it is distinct from the line of the ball and does not depend on who hit the ball last. Its interpretations note that there is no nearside Right of Way.
Who has precedence under the HPA's 2026 rules
Rule 27 sets out an order for deciding who has the right to the ball:
| Situation | Who has precedence |
|---|---|
| Two opponents on the exact line of the ball, making a play on each other | Those two players, over everyone else (Rule 27a) |
| Otherwise, a player on the exact line | The player with the ball on their offside, the right-hand side (Rule 27b) |
| Nobody on the exact line | The player at the lesser angle to it; if tied, the player with the line on their offside (Rule 27d) |
| Players coming from opposite directions | The player riding in the direction the ball is travelling (Rule 27e) |
| The last player to hit the ball | No precedence from that alone, once they have left the exact line (Rule 27f) |
The offside is the pony's right-hand side, and under the HPA's 2026 rules only the right hand may hold the stick.
Crossing
Under the HPA's 2026 rules (Rule 26), no player may cross a player who has precedence except at a distance where there is not the slightest risk of collision or danger.
The USPA's 2024 rules (Rule 24) use the same test for the Right of Way: nobody may enter or cross it except at a speed and distance that carries not the slightest risk. Rule 25 adds that a player who has safely entered another's Right of Way along the ball's established path may slow down or stop, provided the players behind have time to go around.
The right of way of the player in possession
Under the HPA's 2026 rules (Rule 28), a player in possession may continue down the line of the ball to hit it on the offside unless legitimately challenged. Two limits apply:
- A player who suddenly changes the line of the ball into an opponent may not then ride into that opponent and claim a foul.
- Delay (Rule 28d): a marked player who slows to a walk may tap the ball once. Within 5 seconds the team must then hit it away or run with it. "Marked" means an opponent within two pony lengths.
How possession is legally challenged
Precedence does not mean a player cannot be challenged. Both rulebooks allow riding off and hooking, under tight conditions. The riding off and hooking page covers how instructors teach them.
Riding off
Under the HPA's 2026 rules (Rule 31), riding an opponent off the line is allowed when the ponies are travelling at the same speed, shoulder to shoulder, and meet at a safe angle. Elbows must stay close to the side, and pushing with the head, hand, arm or elbow is not allowed.
The USPA's 2024 rules (Rule 26) allow a player on even terms to ride off an opponent or put their mount between the opponent and the ball, but not dangerously. Factors the umpires weigh include relative speed, the size of the mounts, position (dangerous if one mount is more than a foot or two ahead of or behind the other), the angle of convergence (an angle that is safe at low speed can be dangerous at high speed), fatigue and blind-siding. Knocking a mount off balance is, by definition, a dangerous ride-off. Rule 27 bars pushing with the head, hand, arm or elbow, but permits pushing with the arm above the elbow if the elbow stays close to the side.
Hooking
Both rulebooks let a player hook an opponent's stick, under the same core limits:
- HPA 2026 (Rule 30): only from the same side of the opponent's pony as the ball, or directly behind; never over, under or across the pony; only when the stick being hooked is wholly below the shoulder in the act of hitting; never with excessive force. A nearside backhand may not be hooked from behind the player.
- USPA 2024 (Rule 28): only from the same side as the ball or directly behind; never over, under or across the opponent's mount; only while the opponent is hitting (the upswing and downswing both count) with the mallet head below the shoulder; never with excessive force.
After a break in play
The HPA's 2026 rules (Rule 32) add a protection for restarts. After a break in play, the hitter's teammates may not ride off or impede the primary opponent, who raises a stick to identify themselves.
Riding named as dangerous
Some movements are named in both rulebooks as dangerous riding. The HPA's 2026 rules (Rule 34) list zigzagging and pulling across another player among their examples of what may be considered dangerous play, and the USPA's 2024 rules (Rule 26) name zigzagging in front of a galloping player and pulling across a mount's legs. The fouls and penalties page sets out the full lists and what each body awards.