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Is Using Undo Cheating? Solitaire's Oldest Argument

Undo is cheating only if your agreed solitaire rules ban it; casino cheating is a different matter, with law, money, and victims involved.

Manit Kaushal Founder · Veena Games 8 min read

Using undo in solitaire is not cheating unless you agreed to play without it. In a free solo game, undo is a rules setting, like drawing 1 card or 3. The honest question is not law. It is solitaire etiquette: what sort of game did you mean to play?

That answer sounds too tidy because the word cheating carries baggage from casino cards. There, people have marked cards, bribed dealers, moved bets after results, counted cards, and argued over tiny manufacturing differences on card backs. Some methods are crimes. Some are legal skill that casinos still ban. Some are folklore retold by gamblers who prefer a better story than the one the court recorded.

Klondike Solitaire sits at the harmless end of that scale. You play against a shuffled deck and your own decisions. Undo can turn a hard memory game into an analysis game. Restart solitaire can be a fresh puzzle or an admission that the line has gone dead. Neither has a victim. The useful answer is to be clear with yourself before the first move.

Is using undo cheating, or just part of solitaire?

Using undo in solitaire is cheating only under a rule set that says it is. If you are playing a timed challenge against another person, or comparing scores with friends, the rule should be stated before play. If the button is available and the table has no agreed restriction, it is part of the game as presented.

Klondike has always had house rules because it began as a physical-card patience game, not a single official tournament code. Some players allow only forward moves. Some allow a move to be taken back if a card was touched by mistake. Some allow unlimited undo because they treat the layout as a logic puzzle: test the line, see why it fails, return to the fork.

The phrase solitaire undo cheating usually hides a smaller worry: does undo cheapen the win? Sometimes, yes. If the pleasure you want is the old pressure of committing to each move, undo removes that pressure. It also changes memory. You can reveal a card, learn something, go back, and make a different choice. That is a real advantage over strict physical play.

It is still not the same as cheating at a casino table. No opponent is deceived. No stake changes hands. No dealer is fooled. Solitaire etiquette is mostly private honesty. Decide the rule that makes the win feel earned. If you want a clean run, use no undo. If you want to learn, use it. If the position is miserable and you restart solitaire, call it a new deal, not a moral failure.

What counts as cheating in cards, and where is the line between banned and illegal?

Card cheating begins when someone secretly changes the agreed conditions of the game. Marking cards, switching cards, colluding with a dealer, peeking by using a hidden device, or past-posting a bet after the outcome is known are not clever etiquette breaches. They are deception for money. In casinos, those acts can be prosecuted as fraud, cheating at gambling, theft, conspiracy, or related offences depending on the jurisdiction.

Card counting is different. A blackjack counter tracks public information: cards already dealt. The player does not mark the deck, touch the shoe, bribe staff, or alter the result. In many places, that is legal skill. It is also unwelcome. Casinos are private businesses and, in many jurisdictions, can refuse service, ban a player, shuffle earlier, limit bets, or change table conditions.

The famous legal wrinkle is Ken Uston. In Uston v Resorts International Hotel, the New Jersey Supreme Court ruled in 1982 that Atlantic City casinos could not exclude him merely for using his skill at blackjack unless the Casino Control Commission allowed that response. That did not turn counting into a protected right everywhere. It showed the difference between illegal cheating and casino control of its own games.

Edge sorting sits between ordinary skill and deception in a way courts have treated harshly. The player reads tiny differences on card backs, but the advantage often depends on persuading the casino to rotate valuable cards and use favourable dealing conditions. In Phil Ivey's baccarat cases, that persuasion mattered. The cards were not marked by Ivey, yet courts still found the play crossed the line.

Which tricks actually changed real games, and what happened to the people who tried them?

The evidence is strong for some casino methods and thin for others. Court records are better than gambling memoirs. A person who says he beat every casino for years may be selling a legend; a conviction, judgment, or refused payout tells you more.

MethodWhy it can workLegal positionNamed outcome
Card countingBlackjack odds shift as low and high cards leave the deck.Legal skill in many places, but casinos can ban or restrict it.Ken Uston won the 1982 New Jersey case on exclusion rules, not a universal right to count.
Edge sortingTiny asymmetries on card backs can identify card values if key cards are oriented differently.Courts can treat the surrounding conduct as cheating.Phil Ivey lost the £7.7m Crockfords claim in the UK Supreme Court in 2017.
False shuffle with dealer collusionA dealer secretly preserves known card sequences instead of randomising the deck.Crime.The Tran Organization cases produced guilty pleas and convictions in US federal court.
Marked cardsPlayers read hidden signs on card backs before cards are exposed.Crime.Specific old stories are often folklore unless tied to a charge sheet or judgment.
Past-postingA bet is added or increased after the result is known.Crime.Many casino stories exist; without a named case, treat the colourful versions as folklore.

Ivey and Cheung Yin Sun also faced Borgata in New Jersey. Borgata won a judgment of about $10.1m after the court found breach of contract; the dispute was reported settled in 2020. The point is narrow but important: even where the player never physically marks a card, the law may ask whether the agreed game was secretly turned into a different one.

Why do card counting and edge sorting matter in casino games?

They matter because the word cheating is not one clean bucket. Card counting works for a mathematical reason. Blackjack is dealt from a finite pack or shoe. Once a card has appeared, it cannot appear again until the shuffle. A deck richer in high cards tends to help the player: blackjacks pay better than even money, double-downs improve, and the dealer is more likely to bust in some positions. The counter is using memory and arithmetic on public events.

Casinos dislike that because their business depends on a predictable edge over many hands. A skilled counter can change the economics of the table. That still does not make counting the same as marking cards. The player has not tampered with the deck.

Edge sorting matters because it tests a different boundary. In the Ivey cases, the advantage depended on reading manufacturing irregularities and requesting procedures that made those irregularities useful. The casino believed it was offering ordinary baccarat. Ivey's side said he used observation and skill. The courts focused on whether the play breached the rules and honesty expected in the game.

Legal but banned by the house is one category. Crime is another. Civil cheating, breach of contract, and refusal to pay can be another again. A casino can dislike a lawful advantage player without that player being a criminal. A player can also win money by conduct that leaves a court unwilling to enforce the win.

Why does none of this matter on Veena Games?

Frequently asked questions

Final thoughts

If a friend asked me is undo cheating, I would ask what they wanted from the deal. If they wanted the small ceremony of old patience, with every move committed once the card leaves the pile, undo breaks that spell. If they wanted to understand why one line wins and another dies, undo lets them compare the fork without replaying the whole deal.

There is no virtue in making a private game less enjoyable to satisfy an imaginary referee. There is also real satisfaction in setting a stricter rule and keeping it. Both things can be true. Say, even if only to yourself, no undo this run. Or say, I am practising. The discomfort usually comes from pretending one is the other.

Casino cheating is about secret advantage, broken agreements, and money. Solitaire is about a shuffled 52-card problem and the kind of attention you bring to it. The law has work to do when marked cards, dealer collusion, past-posting, or disputed baccarat winnings appear. It has nothing to say about you taking back a move after burying a red 7 under the wrong black 8.

Use undo when it helps you learn. Avoid it when you want pressure. Restart when the deal has stopped being interesting. If you tell someone about the win, be precise: first-pass, no hints, no undo, or just a solved deal after a few rewinds.

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