They had single-deck blackjack that had a unique side bet. Basically you could make additional bets that you would get dealt a natural blackjack, with a couple variations like getting an extra payout for suited blackjack.
This side bet was even more amenable to counting than standard BJ. The morning after I saw it, I did a quick simulation and discovered that the odds turned player-friendly if you went a single hand without seeing an ace.
I went down and played it. There was a crowd on Saturday night, and the deck was shuffled basically every hand. No good. Sunday morning I had the table to myself. I bet aggressively, starting with $5 min bets and going to $50 if I went two hands without an ace.
The dealer knew almost immediately that I was counting. He made a few snide remarks, but didn't kick me out. No idea why not. Maybe because the side bets are usually suckers' bets, so that gave me some camouflage.
I had a great run of luck, doing way better than expected. In an hour or so I was up $1500. Along the way I hit a suited BJ for $250. The dealer called over the pit boss, who told him to pay me, and then side eyed me for the rest of the session. I left only because I had to get to my flight.
The cashier's cage gave me a hassle about cashing in brown $500 chips. I guess they rarely got any big winners there.
Overall great experience for me. I'm not at all surprised they closed the casino soon after.