Citing Ivey's court submission, which it claims to have seen today, the Daily Mail UK reports Ivey says he used a "legitimate technique called edge sorting" to identify cards and gain an advantage at Punto Banco.
The way Ivey sees it, though, the casino knew about the technique and let him do it, meaning it should still pay out his massive winnngs.
Biggest Legal Battle in Casino History
For those who missed the story the first time around, Ivey and a "Chinese associate named Kelly" played Punto Banco over two nights at Crockfords in London in August last year.
Using "edge sorting," meaning reading an asymmetrical printing error on certain decks of cards to tip off which cards are coming, the two racked up £7.8m in winnings the casino then refused to pay out.
The court claim says Ivey asked for several decks to be changed until a deck with the printing error was found. The associate Kelly knew how to find the "good" cards and told the dealer to turn them in a specific way to make them easier to spot.
In both cases, Ivey says the dealer complied. After originally betting £50,000, once the edges had been sorted Ivey asked the casino to raise the maximum bet to £150,000.
As edge sorting is a known technique in the caisno world, Ivey says it's on the casino to check the cards and stop it from happening. They didn't, so the money should be his.
The casino says Ivey "operated a scam" and "acted to defeat the essential premise of the game." To this point it has only returned Ivey's original £1m stake.
The case will be heard in court later this year. Read the full piece here.