A polo match lasts about one and one-half hours and
             is divided into six 7 minute periods or chukkers. Since
             a horse in fast polo can cover two and one-half to
             three miles per period, he'll be too tired to play a
             second one right away. After resting for two or three
             periods, some horses can return to the game. Still, in
             championship polo, a player will come to the field with
             at least six horses. The mounts are horses, mostly
             thoroughbreds, not ponies. The object of the game is to
             score as many goals as possible. There are four players
             on a team and each assumes a specific position either
             offensive or defensive. However, given the enormous
             size of the playing fields, the momentum of the
             galloping horses and the ball's unexpected changes of
             direction, the game is very fluid, and the positions
             continuously change. There are few set plays in polo,
             and good anticipation is almost a sixth sense. With
             thousand pound animals running at speed there is a
             pre-eminent necessity for a right of way rule. The
             central concept in the rules of polo is the line of the
             ball, a right-of-way established by the path of the
             traveling ball. Like the rules of the road, there are
             do's and don'ts governing access to this right-of-way
             and crossing it. Within these limitations, a player can
             hook an opponent's mallet, push him off the line, bump
             him with his horse or steal the ball from him.
             Penalties are awarded as free hits. The more severe,
             the shorter the distance to the goal. The closer hits
             are almost certain goals. After every goal is scored,
             the teams change sides in order to compensate for field
             and wind conditions. A typical score would be 10-7.
             Polo games are played on the flat or the handicap.
             Every registered player is awarded a skill rating from
             C (-2, the lowest) to 10 (the highest). When a match is
             played on the handicap basis, the sum total rat...