As blackjack is now so popular worldwide,
casinos have chosen to adopt a set of playing rules
that can be generally applied everywhere. There are,
however, some noteworthy exceptions:
There are casinos that do not permit players to double-down
after splitting a pair. When considering whether or
not to split low pairs, this can be an important factor
Some casinos disallow soft doubling i.e., doubling
down after receiving an ace as a first or second card.
Other casinos allow doubling on totals of 10 or 11 only.
If one wishes to play seriously, it would be wise
to investigate individual casino rule variations. This
is of course unless you happened to be in Atlantic City,
where, thankfully, all the rules remain the same.