Per [1] (found via wikipedia) 35% is possible![1] <a href="https:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20210924183919&#x2F;https:&#x2F;&#x2F;www.aaai.org&#x2F;ocs&#x2F;index.php&#x2F;ICAPS&#x2F;ICAPS09&#x2F;paper&#x2F;viewFile&#x2F;724&#x2F;1090" rel="nofollow">https:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20210924183919&#x2F;https:&#x2F;&#x2F;www.aaai....</a>

I love seeing this. Klondike with a physical deck was my “I need to do something with my hands or I’ll go crazy” release valve during the pandemic after work. I thought about trying to build something like this, but it was far outside of my technical ability. I settled for a simulator that would run toilet solitaire so I could see the distribution of cards remaining after games with a well-shuffled deck.

Draw 1 is much more winnable than draw 3. With perfect knowledge (or an infinite undo stack), evidently ~80% of Klondike games are winnable. With imperfect knowledge but good strategy, humans win about 11% of draw 3 games. So given they have implemented a more rudimentary strategy (first come, first serve), 8.5% doesn&#x27;t seem that low.

I suspect that the later (Win 7+) versions of Windows solitaire (and minesweeper, for that matter) did, in fact, cull the unwinnable games.

The Microsoft Solitaire Pack or whatever the current branding is does, indeed do something behind the scenes to ensure the game is winnable.I suspect they have either a massive database of proven-winnable shuffles, or before the game presents a new deck to you, it solves it in the background to prove it&#x27;s winnable.Personally I dislike this feature. Yeah it sucks to get an unwinnable shuffle, but that&#x27;s just how card games work. Ensuring every game is winnable just seems like addiction engineering when it&#x27;s next to the Microsoft logo.Part of the fun is the uncertainty that a game is possible to win. If you know up front that a deck is guaranteed solvable, it really colors how you play the game.

The current version, you can play on &#x27;Easy&#x27;, I think my kindergartner wins all his games on that setting.

It wouldn&#x27;t be that difficult to make computer solitaire winnable 100% of the time actually. It would mean &quot;cheating&quot; by moving cards around behind the scenes thoughThere&#x27;s an assumption with computer card games that the computer shuffles the deck once just like a real card game but that doesn&#x27;t have to be true on the computer if you don&#x27;t want it to beNow, any reasonable player would notice if you reshuffle the deck in solitaire, but you could swap around the face down cards without any problem. You could have just one stack of face down cards in memory and always pop from the top when a card is flippedEdit: Maybe this wouldn&#x27;t be winnable 100%, but you could certainly nudge every hand towards being winnable

Winning 2000 games in a row sounds statistically unlikely unless the Windows version of solitaire does something behind the scenes to make the game more winnable.<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Klondike_(solitaire)#Probability_of_winning" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Klondike_(solitaire)#Probabili...</a>

Similarly, my half-sister&#x27;s mother was almost allergic to anything technology, except for to play Solitaire, which she did every single day. I think many of the games offer configurable &quot;difficulty&quot; though, there are modes where it&#x27;s guaranteed to be solvable for example. And most of them surely are made slightly easier by default.With a randomly shuffled real deck, wouldn&#x27;t surprise me that it would be ~10%,.

Yes, it is low, but that is the challenge to fork the repo and up the winning percentage.

Low for a human, yes. But for a computer simulation, it&#x27;s a record high.

Isn&#x27;t 8.5% low?My mom didn&#x27;t use the computer much except she did play solitaire on her Windows laptop all the time. She had over a 2000 game win streak until she got dementia and stopped using the computer altogether.

Solitaire simulator for finding the best strategy: Current record is 8.590%