Number of Decks
The number of decks used changes the house edge. Though this may not seem like it should matter, the mathematicians have run the numbers over and over and it’s true.
A single deck game decreases the house edge by almost a half percent over an 8 deck game. The reduction is much smaller for a two deck game, coming in at just under .2%.
Four, five, and six deck games are only slightly better than 8 deck games, decreasing the house edge by .02 to .06%.