The name comes from the shape of the layout, with two pyramid formations, a smaller one within a larger one. If you prefer, you can forgo its namesake and use a more compact layout.
Two decks of cards
Object: Play all cards to the foundation.
Tableau: 21 piles.
Cards can not be played to here.
You can pick up and play the top card of a pile.
Reserve: 4 piles.
Only the stock can play to here.
You can play any card here regardless of rank or suit.
You can pick up and play the top card of a pile.
Stock: Holds the 82 undealt cards.
Turns the top card face up.
Foundation: 8 piles.
One dealt card determines the base rank.
Play the base rank to empty piles.
Rank is built up. Cards must match the same suit.
Rank order wraps from king back to ace.
