For example, suppose the 6, 5, and 4 of hearts are together at the bottom of a pile, with the 4 bottommost. They may be moved as a unit, or the 4 can be moved by itself, or the 5 and 4 can be moved without moving the 6. If the 6, 5, and 4 were moved onto a 7 of hearts at the bottom of some other pile, the four cards could then be moved as a unit onto any 8; if the 7 were not a heart, however, then once the hearts were placed upon it it would not be available to be moved until the hearts had been moved from it (to another 7 or into a space; see below).
When all face-up cards have been removed from a pile, the bottom face-down card is turned up and becomes available for play.