Where I play, there are a lot of 6 and 8 decks games. I made some money strolling from table to table, spotting a shoe which started earlier but had only few rounds into the game, waiting for it to become +8 and then wong in.
The casino wont mind this tactic, I guess because I obviously wong to some negative shoes too. I assume in the long run I have some advantage, since some of the shoes will be higher than +8 (due to the cards which were dealt before) and they will balance the negative shoes.
Am I right? Do I have some advantage playing this way?