A legal move is not always a helpful move. Good Klondike play often means choosing the move that creates a useful next choice. These are planning habits, not rules that can guarantee every game will finish.
Look for a reveal
Before moving a face-up run, ask whether it uncovers a hidden card. Revealing a card gives you information and may open another move. When two similar moves are available, compare what each exposes rather than moving the first available card.
An empty column is useful only if you can put something useful there. Check for an available King or King-led run before clearing space, and consider whether relocating it will uncover another card.
Do not rush every card home
Foundations are the goal, but a card in the tableau may still be a useful landing place. Before moving it upward, look for lower cards that need that color and rank. Some positions benefit from moving a foundation top back to the tableau; the rules here allow that.
Low foundation cards are often helpful progress. That does not make every higher foundation move automatically safe in every position.
Plan a stock pass
In Draw 3, consider the cards underneath a playable waste top before drawing again. Playing that top may expose an immediate opportunity. Keep an eye on which tableau cards are blocking a useful stock card.
Use assistance as a way to explore
Undo can test an idea without losing the original position. Smart Hint suggests a move on a verified winning route when available. If the solver reaches its limit, unknown means it has not established the answer—not that you have failed or that the deal is impossible. Choose a certified deal when you want to know the starting position has a solution.