On each hole, one player in each foursome is designated the "lone ranger." That designation rotates throughout the round; for example, Player A has it on the first hole, B on the second, C on the third, D on the fourth, then back to A on the fifth and so on.
In Lone Ranger, two scores per hole are added together for the team score. Here's the catch: One of those two scores must be from the Lone Ranger. So on each hole, the team score will be the score of the player designated the Lone Ranger, plus the lowest score of the other three players on the team.
See Money Ball for a few variations on the game.

