Solitaire terms explained: tableau, foundation, stock and waste
The tableau is where you play, foundations are the Ace-to-King piles you fill to win, the stock is the face-down rest of the deck, the waste its face-up pile.
Which solitaire game is the hardest to win?
Pyramid. With every card known, 66% of Pyramid deals can be won, against 82% for Klondike Turn 3, 97% for TriPeaks and Spider and 99.999% for FreeCell.
Is every Klondike solitaire game winnable?
No. With all cards visible, about 90% of Turn 1 and 82% of Turn 3 Klondike deals can be won; the rest are lost from the start. Hidden cards cost more.