Sending cards home
Sending cards to the foundations feels like progress, and sometimes it is a mistake. A card on a tableau column can hold a lower card of the other colour; once it is home, it cannot.
The rule
A card is safe when every card that could still be stacked on it is already home, or is free to follow it there. With both black fives and the four of hearts up, the seven of diamonds is safe: the only cards that could sit on it are the black sixes, and they can leave whenever they like.
What this site does
It sends those cards up for you, so you never have to think about it. Microsoft FreeCell is stricter and holds that seven back until both black sixes are home — both are safe, ours just saves clicks.
Aces and twos
Always safe, always immediately. Nothing can ever need them, and every turn they spend on the tableau is a turn they spend in your way.
No taking cards back
Once a card is on its foundation it stays there: this site does not let you pull it back down onto the tableau. That is exactly why the automatic moves only take cards that nothing could still need.
On a real board: deal 1
This is deal 1 after 4 hints, exactly as the board draws it. The solid outline marks the card the next hint moves; a dashed outline marks the card it is working towards.
On the board, this one reads: Parked in a free cell to open what was underneath. You can still move 2 at once.
The hint parks the 2♣ in a free cell. That uncovers a card a foundation is waiting for, and in the same move the game sends 3 cards home on its own: A♣, 2♣, A♠. The parked card is one of them — it leaves the cell as soon as its ace is up. You never click any of this: each card was safe by the rule above, so the board does it for you.
Play deal 1. Open it and press Hint 4 times to reach this spot.