This is the Afghan national sport.
Its name means "hit the goat" in Turkish. The reason is, in fact, due to the horsemen have to drag the carcass of a goat toward a door.
Knights usually wear heavy clothes and there is no regulation, but just a code of honor to be respected. For example, players cannot intentionally unseat other players.
This game was banned by the Taliban few years ago, but now it is played again.
The games are usually held on Friday and it's almost always sponsored by wealthy Afghans.