According to the search results, the percentage of solitaire games that are winnable varies depending on the type of solitaire being played. However, the majority of solitaire games, almost 80%, are winnable. It is worth noting that this does not mean that players win 80% of the time, as some games may have a solution but a player may still struggle to win. Some solitaire variations have higher odds of winning than others, with FreeCell having the highest chance and Pyramid Solitaire having the lowest. If one lets the cards from the final pile be moved back to the table in order to create more moves, then the odds do go up between 82% and 92% . However, it is impossible to know the exact odds of winning a randomly dealt game of solitaire, as it depends on the players knowledge of all 52 cards and where they are. In summary, while not all solitaire games can be won, many are winnable, and the odds of winning vary depending on the type of solitaire being played.