How many people do you need to play a game of solitaire?

The game is played with two decks—by two people. You each get a deck and you each lay out your own tableau. You lay out the cards in the standard (Russian) Solitaire way and begin to play in the exact same way as Russian Solitaire. You deal three cards at a time from your stock pile.

What are the odds of winning a game of solitaire?

Ultimately, very little is known about the winnability of regular Klondike. The number of games a skilled player can probabilistically expect to win has been estimated as at least 43%, but this gives a massive gap of almost 40% between that number and 82%.

Is it possible to finish every game of solitaire?

Solitaire is a game that precedes its computer version, and that means that all the cards are truly shuffled, without the computer peeking in to verify the game is solvable. And like McKay mentioned, with a random shuffle you can definitely end up with an unsolvable game.