It's interesting, but Tarzan, just posted some concerns that can make tracking a second table more difficult, obviously crowded conditions and NMSE, which would make the technique moot. Those are issue on the east coast. Here in Vegas, we have few NMSE tables and it was the less crowded conditions here (in Vegas) that lead me to start using this technique to begin with. I did not track multiple tables when I was back east. Tarzan also raised the concern about accuracy and missed cards. Tracking a second table is like back-counting. The count at the second table need not be perfect. Just enough to know that is a superior opportunity than the table you are currently playing.
https://www.blackjackinfo.com/commun...-tables.55670/