Double exposure blackjack is played very much the same as blackjack, except that both the dealer's cards are exposed. Since this would normally be a strong player advantage, the casino tightens some rules to put the odds back in its favor. The two most common rule changes for double exposure games are: Blackjacks pay even money (instead of 3-2) and the dealer wins all pushes (ties).
Double exposure with the standard rules listed above and a 6-deck game provides the house with an advantage of 0.35% according to Stanford Wong's BJEdge software. This is in line with the house edge on standard BJ games. It's important to note, however, that the basic strategy for double exposure BJ is more complicated than the regular BJ basic strategy.
One notable difference is that there are several circumstances where you split 10s(against dealer 13-16).
If you find a double exposure game where blackjacks pay 3-2, the player has a 0.25% edge over the house, according to BJEdge. These are rare, but one was sighted at Binion's Horseshoe as recently as in 2003. Any double exposure game where blackjacks pay 3:2 is likely to have a player and not a house advantage.
