Edge sorting led two casinos, two legal systems, Phil Ivey and advantage player Cheung Yin Sun into years of litigation over what counts as cheating. Playing baccarat in 2012, the pair finished £7.7 million ahead at Crockfords in London and won approximately $9.6 million across four visits to the Borgata in Atlantic City. Crockfords declined to pay the winnings. The Borgata paid, then went to court to recover the money.

Sun’s expertise in identifying small differences in the backs of playing cards was central to the sessions. The method combined those visible asymmetries with dealer requests that created and preserved a particular card orientation. Ivey regarded the process as legitimate advantage play. Both casinos argued that the pair had gone beyond observing an exposed weakness and had arranged the conditions required to exploit it.

The central dispute ultimately went against Ivey in both jurisdictions, although the cases began from opposite payment positions and followed different legal routes. The UK Supreme Court held that the conduct amounted to cheating. The US court found contractual and regulatory breaches while granting Ivey and Sun summary judgment on the Borgata’s fraud-based claims.

This article explains how edge sorting worked, what each court decided, and why the method has little relevance to ordinary live dealer baccarat today.

What edge sorting actually was

Playing cards are cut from large printed sheets. When a sheet is cut fractionally off-center, a repeating pattern on the back of a card may not appear perfectly symmetrical from one long edge to the other. On most decks, the difference has no practical value. On a suitable repeating design, someone familiar with the pattern may be able to distinguish one orientation from the other.

The asymmetry alone is worth nothing because cards arrive in mixed orientations. What made the method useful in the Ivey sessions was the sequence that followed. Selected high-value cards were rotated by 180 degrees at the players’ request, the same physical cards were used again, and the shuffling process preserved their orientation.

Once those conditions held together, the orientation could indicate whether the first card belonged to the selected high-value group, creating what the Borgata litigation described as first-card knowledge. It did not reveal the exact rank of the next card.

The dependency chain was the heart of the method.

Edge sorting required a suitable card back, dealer-assisted rotation, reuse of the same cards, and a shuffle that preserved their orientation. Ivey and Sun did not physically mark or alter the cards. They arranged the conditions under which the casino’s equipment gave information away, and the courts examined that arrangement rather than the act of observation alone.

Two playing card backs showing how an asymmetrical repeating edge pattern changes after a 180-degree rotation
An off-center repeating pattern can make one long edge of a card back look different from the other.

Was Phil Ivey’s edge sorting legally cheating?

In the UK, yes. The Supreme Court unanimously held that the conduct amounted to cheating under the Gambling Act. Ivey’s sincere belief that edge sorting was legitimate advantage play did not change the result.

The US case reached a different legal question. The District Court found that Ivey and Sun had breached their agreement with the Borgata through noncompliance with New Jersey casino regulations governing the cards used in licensed games. It granted the Borgata summary judgment on its contract-based claims and granted Ivey and Sun summary judgment on the casino’s fraud-based claims.

The fraud ruling cannot be compressed into a finding that the US court cleared Ivey of cheating. The court did not decide the same statutory cheating question considered in the UK. It resolved the dispute through gaming regulations and contract law.

Edge sorting should also be separated from claims that an ordinary licensed baccarat game is secretly manipulated. Richard Marcus examines that distinction in his analysis of whether baccarat is rigged.

Timeline of the Ivey cases

The Crockfords and Borgata disputes unfolded across two legal systems at overlapping times, which is why their dates and outcomes are often conflated.

Timeline of the Phil Ivey and Cheung Yin Sun edge-sorting cases, from the 2012 baccarat sessions through the 2017 UK Supreme Court ruling.
When What happened
April–October 2012 Phil Ivey and Cheung Yin Sun played baccarat at the Borgata in Atlantic City across four sessions, winning approximately $9.6 million. The casino paid the winnings.
August 2012 Ivey and Sun played punto banco at Crockfords in London over two days and finished £7.7 million ahead. The casino returned the stake but declined to pay the winnings.
2013 Ivey sued Genting Casinos in the English High Court to recover the unpaid £7.7 million.
2014 Marina District Development Co., trading as the Borgata, filed suit against Ivey and Sun in the US District Court for the District of New Jersey.
October 2014 The English High Court dismissed Ivey’s claim, finding that the conduct amounted to cheating for the purposes of the casino contract.
October 21, 2016
Borgata liability decision:

The District Court found that Ivey and Sun breached their contract through noncompliance with the New Jersey Casino Control Act. The court granted Borgata summary judgment on its contract-based claims and granted Ivey and Sun summary judgment on Borgata’s fraud-based claims.
November 2016 The Court of Appeal dismissed Ivey’s appeal by a majority.
December 15, 2016
Borgata damages decision:

The court set damages at $10.13 million on a status-quo-ante basis, requiring the return of the benefits received from the breached contract rather than awarding speculative lost profits.
October 2017 The UK Supreme Court dismissed Ivey’s appeal unanimously in Ivey v Genting Casinos [2017] UKSC 67. The court rejected the subjective second limb of the Ghosh test and restated the approach to dishonesty in English law.

Primary sources: the UK High Court and Court of Appeal decisions in Ivey v Genting Casinos, the
UK Supreme Court case record,
plus the Borgata
liability opinion of October 21, 2016
and
damages opinion of December 15, 2016
in Marina District Development Co. v. Ivey.