Phil Ivey – Edge Sorting Expert or Casino Cheat?

Phil Ivey’s edge-sorting cases became some of the most famous gambling disputes of the modern era because they raised a difficult question: when does advantage play become cheating?

Ivey and his playing partner Cheung Yin Sun did not mark cards themselves, use hidden electronics or secretly alter the equipment. Instead, they identified tiny manufacturing differences on the backs of playing cards and persuaded casino dealers to rotate certain cards so those differences became useful.

The method gave them a genuine mathematical advantage at baccarat. The legal problem was how that advantage had been created.

The central issue was not whether edge sorting worked. It clearly did. The question was whether using the dealer to preserve and reveal information the game was not supposed to provide crossed the line from observation into unlawful or impermissible manipulation.

Who Is Phil Ivey?

Phil Ivey is one of the best-known professional gamblers in poker history.

He built his reputation through tournament poker, high-stakes cash games and mixed-game play. Ivey was inducted into the Poker Hall of Fame in 2017 and currently has 11 World Series of Poker bracelets, placing him second on the all-time bracelet list.

His edge-sorting cases became famous precisely because they involved a player already known for looking for legitimate mathematical advantages rather than simply gambling recreationally.

What Is Edge Sorting?

Edge sorting uses tiny differences in the printed pattern on the backs of playing cards.

Some card designs appear symmetrical at first glance but are not perfectly identical when viewed from opposite directions. If one important group of cards is consistently rotated one way and another group the opposite way, a skilled observer can sometimes identify which type of card is about to be dealt by looking at its exposed edge.

That information is particularly valuable in punto banco baccarat because players normally bet before knowing what the next cards will be.

Why Would Knowing the Next Card Matter in Baccarat?

Because the value of the first card can change which side offers the better bet.

Ordinary baccarat gives the casino a small mathematical advantage because players normally have no information about the unseen cards beyond the composition of the shoe.

Edge sorting changes that information balance. If a player can identify whether the next card belongs to a strategically important group before placing the bet, the decision is no longer being made blind.

In the Crockfords case, the UK Supreme Court described evidence that accurate edge sorting could shift the normal house advantage into a player advantage of roughly 6.5%.

Did Ivey and Sun Mark the Cards?

Not in the ordinary sense. They did not draw on the cards, scratch them or physically alter the printed pattern.

The asymmetry was already present because of how the cards had been manufactured. The important step was getting selected cards turned 180 degrees so the existing differences became useful during later deals.

That is what made the cases legally unusual. The information came from a real imperfection in the casino’s own cards, but Ivey and Sun did more than simply notice it.

How Did Phil Ivey and Cheung Yin Sun Make Edge Sorting Work?

The pair requested specific playing conditions before the high-stakes baccarat sessions.

At Borgata, those conditions included a particular type of Gemaco card, an automatic shuffler that preserved card orientation, a Mandarin-speaking dealer and permission for Sun to ask that certain cards be rotated.

The requests themselves looked harmless. Sun presented the card-turning requests as superstition or preference rather than explaining their real purpose.

Once the strategically important cards had been turned, the automatic shuffler mixed the deck without rotating them back. On later deals, the different edge patterns allowed Sun and Ivey to identify useful card groups before they were revealed.

Why Did They Need the Same Cards to Be Reused?

Because edge sorting becomes useful only after the cards have been arranged by orientation.

On the first pass through a fresh shoe, the relevant cards have to be identified and turned. If the casino then replaces the deck or uses a shuffle that randomly rotates the cards, the information disappears.

Reusing the same cards with an automatic shuffler preserved the orientation they had created. That allowed the pair to benefit from the information during later shoes.

Why Was Cheung Yin Sun So Important?

Sun had extensive experience identifying card-back irregularities and communicated the rotation instructions to dealers in Mandarin.

Ivey provided the high-stakes bankroll and placed the bets, but Sun’s ability to read the cards was central to the technique. The court records describe her directing dealers to rotate strategically important cards so that the two groups could later be distinguished.

This is why describing the episode simply as “Phil Ivey spotted bad cards” misses the important mechanism. The advantage depended on both observation and deliberate preservation of card orientation.

How Much Did Ivey Win Using Edge Sorting?

In 2012, Ivey and Sun won roughly $9.6 million during four baccarat sessions at Borgata in Atlantic City.

They also played punto banco at Crockfords in London and finished about £7.7 million ahead there. Crockfords returned Ivey’s original £1 million stake but refused to pay the £7.7 million winnings after investigating the play.

The two casinos then pursued very different legal routes because the games took place under different laws.

What Happened at Borgata?

Borgata sued Ivey and Sun in New Jersey after discovering how the sessions had been played.

The federal court did not accept every claim made by the casino. Importantly, it found in Ivey and Sun’s favor on Borgata’s fraud claim because they had not violated the ordinary rules of baccarat itself and Borgata had not proved the required material misrepresentation for fraud.

However, the court still ruled against them on the central contractual issue. It held that using the rotated cards amounted to using marked cards in violation of New Jersey casino law, which also breached their obligation to play according to the legal rules governing the casino.

The eventual judgment exceeded $10 million because it included the baccarat winnings and additional money Borgata argued had been won during associated craps play.

Did the US Court Say Phil Ivey Cheated?

The answer is more nuanced than that.

The New Jersey federal court rejected Borgata’s fraud claim, but it concluded that Ivey and Sun had breached their contractual obligations by creating and using a set of cards whose orientation allowed values to be identified in violation of state gaming law.

So the US ruling was not simply “Ivey cheated” or “Ivey did not cheat.” Different legal claims produced different answers.

What Happened to the $10.1 Million Borgata Judgment?

The litigation continued for several years after the original ruling.

Borgata pursued Ivey’s assets while Ivey and Sun appealed, and the casino was eventually permitted to pursue assets in Nevada. In 2019, some of Ivey’s poker winnings were seized as part of Borgata’s collection efforts.

The case did not finish with a final published appellate ruling on the merits. In 2020, the parties reached a settlement while the appeal was pending.

The terms of that agreement were confidential, so we do not know exactly how much Ivey ultimately paid Borgata.

What Happened at Crockfords in London?

The British case ended more clearly.

Crockfords refused to pay Ivey’s £7.7 million winnings, and Ivey sued to recover them. He openly admitted using edge sorting but argued that it was legitimate advantage play rather than cheating.

The case eventually reached the UK Supreme Court.

What Did the UK Supreme Court Decide?

The Supreme Court ruled against Ivey in October 2017.

The Court accepted that Ivey genuinely believed his conduct was legitimate advantage play. It also accepted that he gave truthful evidence about what he had done.

But his personal belief was not enough.

The Court concluded that directing the dealer to rotate cards for a hidden purpose interfered with the game in a way that amounted to cheating. Ivey therefore could not recover the £7.7 million Crockfords had refused to pay.

Why Did the UK Court Treat Edge Sorting as Cheating?

The key issue was not simply that Ivey noticed defective cards.

If a player passively notices information the casino has accidentally exposed, that can look much more like ordinary advantage play. Here, however, the cards became useful because Sun persuaded the dealer to turn selected cards while concealing why the orientation mattered.

The dealer believed she was accommodating a superstition. In reality, her actions were helping create a system that revealed information about future cards.

The Supreme Court regarded that intervention in the game as crossing the line.

Was Phil Ivey Dishonest?

The Supreme Court did not base its decision on proving that Ivey personally believed he was behaving dishonestly.

In fact, the courts accepted that he genuinely considered edge sorting to be legitimate advantage play and was protective of his reputation as someone who did not cheat.

The legal question was whether the conduct itself amounted to cheating, not whether Ivey privately thought it did.

The case became important beyond gambling because the Supreme Court also used it to clarify the test for dishonesty in English criminal law.

Is Edge Sorting the Same as Card Counting?

No. The two techniques gain information in different ways.

A blackjack card counter watches cards that have already been openly dealt and uses that information to estimate the composition of the remaining shoe. The counter does not normally need the dealer to change the cards or equipment.

Edge sorting can begin with observation too, but Ivey and Sun’s method required certain cards to be deliberately rotated and then kept in that orientation.

That extra intervention was central to the court decisions.

Is Edge Sorting the Same as Marking Cards?

Not physically, but the legal effect was treated similarly in the Borgata case.

Ivey and Sun did not manufacture or physically mark the cards themselves. The visible asymmetry already existed.

The New Jersey court nevertheless concluded that having selected cards rotated into identifiable orientations created a set of cards that functioned as marked cards under the state’s casino rules.

This is another reason the case cannot be reduced to the simple question of whether Ivey personally touched the deck.

Could Ivey Have Used Edge Sorting Without Asking the Dealer to Turn Cards?

Only if the useful cards happened to arrive in predictable orientations already, which would make the opportunity much less reliable.

The dealer requests were what converted a manufacturing imperfection into a repeatable information advantage. Once key cards had been oriented differently and the automatic shuffler preserved those orientations, the pair could identify useful groups during later shoes.

Without that step, the asymmetric backs alone would not have produced the same reliable edge.

Why Didn’t the Casinos Just Notice What Was Happening?

At the time, the requests looked like high-roller preferences.

Casinos routinely accommodate valuable customers with private tables, particular dealers and other requests. Ivey was wagering very large amounts, and the casinos agreed to the conditions he requested.

The problem was that several apparently unrelated requests worked together. The particular cards supplied the asymmetry, the dealer rotations sorted important cards, and the automatic shuffler preserved their orientation.

Each request looked less suspicious in isolation than the complete system did afterwards.

Were the Casinos Responsible for Using Defective Cards?

The defective card pattern certainly made edge sorting possible, and Borgata also pursued claims involving card manufacturer Gemaco.

But that did not give Ivey and Sun an automatic legal right to exploit the cards in any way they chose.

The courts focused on how the advantage was created and used. A casino failing to detect a weakness does not necessarily make every method of exploiting that weakness permissible.

Does Edge Sorting Actually Change the House Edge?

Yes. This is what makes it fundamentally different from betting systems such as Martingale.

Martingale changes how much you wager after previous results but gives you no new information about the next hand. Edge sorting gave Ivey and Sun information about the type of card about to be dealt before they chose their bets.

The UK Supreme Court’s case summary noted evidence that perfect edge sorting in the game could produce a player advantage of about 6.5%.

The betting pattern did not create the edge. Information did.

What Did Edge Sorting Actually Change?

Was Edge Sorting Advantage Play or Cheating?

Ivey consistently argued that it was advantage play. His position was that the casino supplied the cards, accepted every request and remained responsible for protecting its own game.

The courts accepted important parts of the factual story, including that Ivey genuinely believed he was acting legitimately and that the card defects already existed.

They nevertheless rejected the conclusion he wanted.

In Britain, the Supreme Court held that using the dealer to manipulate card orientation for a concealed purpose amounted to cheating. In New Jersey, the federal court found that the resulting card arrangement violated casino rules against marked cards and therefore breached the gambling contract, although it rejected Borgata’s separate fraud claim.

So the most accurate answer is that edge sorting can be genuine advantage play in the mathematical sense while still being impermissible under the rules and law governing the game.

What Is the Most Important Lesson From the Phil Ivey Case?

The case shows why not all gambling advantages are legally equivalent.

Seeing public information, making better probability estimates and choosing favorable bets can all create legitimate edges in some forms of gambling. But when an advantage depends on changing the game environment, getting a dealer to unknowingly assist or creating information that the game was designed to conceal, the legal position can change sharply.

This is why the line cannot simply be drawn at “did the player physically touch the cards?” The more useful question is how the informational advantage was created.

How Did the Phil Ivey Edge-Sorting Cases Finally End?

The UK case ended in 2017 when the Supreme Court unanimously dismissed Ivey’s appeal, leaving Crockfords entitled to withhold the £7.7 million winnings.

The Borgata dispute continued longer. After the New Jersey federal court entered judgment against Ivey and Sun and Borgata began pursuing assets, the parties reached a confidential settlement in 2020 while the appeal was pending.

That means there was no final published appellate decision overturning or affirming every part of the US judgment, and the financial terms of the settlement remain private.

Edge sorting worked because it changed the information available before the bet. Ivey’s problem was not mathematical. It was that the courts concluded the way that information had been created crossed the rules governing the game.