Card counting is a viable way to make a living, which is the majority of what Dominic did in his blackjack adventure. Mnemonics is virtually useless for counting besides memorizing strategy charts and holding the count between rounds or while talking, at least, not necessary.
When Dominic talks about using memory techniques to beat blackjack, he is referring to Ace Sequencing. He consulted with the leading blackjack experts, including Arnold Snyder who wrote the excellent book “The Shuffle Tracker’s Cookbook” which teaches ace sequencing, and he is also the author of the famous “Blackjack Forum” which is now online.
Sequencing involves memorizing “key cards” that are discarded on top of an ace in the discard tray, usually 3 cards, during play. This can only be done on specific weak hand shuffle blackjack games, after hours of training that specific shuffle, a speed card system, and a deep understanding of blackjack, you might be able to do it. Most games like this, don’t exist anymore.
Anyway, your key cards should appear equally spaced out during the next game, depending on the shuffle. When you know where your ace is going to land, bet big, really big.
The average card counter enjoys a 1% edge on everything they wager. The sequencer enjoys a 51% edge on everything they wager on the hand that receives a sequenced ace.
Ace sequencing is mostly a thing of the past. You couldn’t make a living solely doing it anymore, and you would be extremely lucky to get one game a year scouring the earth. A very fascinating piece of professional gambling though.