Diamond collects both decks on one central foundation, building upward by rank without regard to suit. Its first card may be any rank; kings wrap to aces.
A card cannot jump across the board
Tableau moves must come from a neighboring space, including diagonal neighbors. Build a pile one rank higher or lower regardless of suit, with king–ace wrapping; move only one exposed card. An empty space accepts a card from a neighbor. The waste is the exception: its exposed card can reach any legal destination.
Bring the next rank within reach
Twelve piles hold seven cards each, with only their ends visible. The other twenty cards form a draw-one stock with unlimited passes. Locate the central foundation’s next rank and plan a short route through neighboring spaces. A legal move far from the center helps only if it opens a path for a needed card.