Not directly related, but similar approach... Around 20 years ago. One of the eastern block countries, short after the transformation. Officially democratic but practically in a limbo between old and new system. Gambling law allows to run casinos but also a small slot machine parlors - gambling dens for poor and naive, occasionally getting rich for a short time, before they loose everything again and put in even more. Novomatic slot machines are deployed in large quantities in those places. Among them American Poker 2 (which you can play using MAME [1] if you like.) A crud machine, considering AAA games released at the time, nonetheless serves its purpose well. No one cares about 3D and shaders in those places, anyway. Two men enter the parlor. One does not speak local language at all, the other is born local but lived abroad long enough to get the weird accent. They buy a game for a minimum amount of money and lose everything fast. Not even trying to win, just passing cards at the same time noting the sequence in cell phone. Cell phones aren't allowed in the parlor but they are quick, no one sees anything, besides, they are trained in memorizing the sequence if needed. They leave the parlor "for a smoke," come back after few minutes, insert a minimum amount again and win every single deal. That must have been a really lucky smoke! They cash in a lot, leave a considerable tip to the staff and off they go. Apparently American Poker 2 is popular in whole eastern Europe at the time and, apparently, ROM version is the same everywhere. They are visiting every city big enough to have multiple parlors. They are visiting multiple countries in the region. They don't work alone, obviously. They become bold and try to cut a deal with a parlors' staff. In many places they succeed - it's a lousy job in lousy place. Especially on night shifts and they rarely visiting during the day. It's safer that way. So they come, they get a tip from the staff about which slot machine is money fat this night. It matters more for the staff then for them, it looks better in daily report. They win, share some with the staff and go to another parlor or another city. But sooner than later a pattern starts to form and some notices the behavior of two always winning regulars. Gossip starts to follow them. It's harder to get by unnoticed. In the end, maintenance crew updated the game ROM in all machines and the trick stopped to work. At least for a while. No one ever caught the lucky winners.

[1] http://www.gamesdatabase.org/game/arcade/american_poker_ii