I think in blackjack, a game that is popular for its low house edge, variations in rules such as whether the dealer hits on a soft 17 or whether players can double down after splitting can have a significant impact on the house edge and the optimal strategy for players. A rule that benefits the player, such as allowing players to double down after splitting, decreases the house edge and allows players to make more profitable decisions. On the other hand, a rule that benefits the dealer,