As the number of players available increases they are divided as follows: As in computer language, the first item - scrub - is counted as 0.
With twelve or more players the game is generally played with two teams divided as evenly as possible.
Automatic (invisible or ghost) runners advance the same number of bases as the batter does, and may be forced out.
Generally the game was called workup when there were three or four players on the batting team and everyone else in the field, with four bases in use.
This often occurs in crowded play areas, such as schoolyards, where the use of bats and baseballs is usually banned for reasons of safety.
President Warren G. Harding played scrub baseball as a boy [1], as did the historian Bruce Catton[2], and rockabilly singer Sonny Burgess [3].