This position is one of the most difficult to play. Number One needs anticipation, determination, and self-control, being theoretically responsible for scoring goals and neutralizing the opposing Number Four (defensive player).
Number Two: The “Hustler” or “Scrambler"
This forward/offensive player is always scrapping for the ball. Number Two needs extremely maneuverable, fast ponies, a keen eye, and an optimistic, aggressive nature.
Number Three: The "Quarterback" or "Pivot Man"
This player must be a long, powerful hitter and is the tactical leader. He/she must feed balls up to Number One and Number Two, but he must also help maintain a solid defense. Number Three is usually the best player on the team.
Number Four: The Back or "Defense"
Although this player may move anywhere on the field, their main duty is to prevent scoring.
The horses used in polo are in fact above the 14.2 hands height of a normally defined pony. However, the correct term for these majestic team-members are "ponies". There is no height limit for the ponies, although most are between 15 and 15.3 hands.
Horses are selected for speed, agility, and obedience. A good horse is capable of stopping on a dime, working with other horses and riders, and moving quickly with the flow of play
Their main qualities are speed and stamina; the ability to accelerate, stop and turn quickly; and temperaments that are amenable to the rigours of the game.
Players suggest that the pony can account for as much as 80 per cent of their overall performance.