The perfect score in blackjack is 21. This is the theoretical maximum that a player can achieve without violating any of the rules of the game.
In practice, however, most players will not achieve a perfect score. The average score achieved by players in casinos is around 16 or 17.
There are a few reasons for this. First, as mentioned above, the perfect score in blackjack is theoretically possible but extremely rare.
Second, even if a player does achieve a perfect score, it is usually not enough to guarantee a win. Third, even if a player does achieve a perfect score, it is still possible to lose money if the dealer has a good hand and the player does not.
Overall, then, it is safe to say that the average player will not achieve a perfect score in blackjack and that achieving one is not necessarily an advantage over playing without one.
