So you should memorize it and play by it, in most cases ignoring your guts, there is no plays for those on the blackjack table. One hint you should remember, if you are unsure, is that you assume the dealer down card is a ten and think about what would happen if you get a 10, this is because, as previously mentioned 10s make up for 16/52 cards, so biggest chance of getting one of those.
First some basic tips on hard hands will be explained, as said before hard hand is any hand that doesn’t have an ace, or has one that you have to count as 1. First thing you should always follow, is that you always hit on hard 8 or lower, for quite basic reasons, you can never bust. Second most basic thing to know is to always stand on hard 17 or higher, the chances of getting something good and going bust, are very low, and should not be tempted.
Hands that are between 12 and 16 are generally referred to as “stiff hands”, quite obviously most people will hate those hands, because they are not good enough to beat the dealer, and also have a good chance of busting. Hard 9s, 10s, and 11s, might make good hands for doubling down, because in most cases one card is usually what you will take. The basic of this is that, assuming you will get a 10, this will make a really solid hand out of what you have.
If you get a hard 9, double down if the dealer has 3, 4, 5 or 6, otherwise hit. The reason you do this is that in addition to assuming you will get 19, which is a rather solid hand, you are also assuming the dealer has a hidden 10, making his hand a stiff one, with a good chance of busting. If you get a hard 10 double down if dealer has 2-9. If the dealer has an ace or a ten, just take a regular hit, it is not wise to invest more money in it, because assuming again u get a ten and he gets a ten, you will either get a push or loose.
If you get a hard 11 double down if dealer has anything except an ace showing, in which case just take a hit. Well if you have 11, doubling up is most likely to lead to 21, therefore only dealer ace can ruin that for you, and only that case is not worth investing into. A hard 12 is a tough hand, if the dealer has 4, 5, 6 showing you should stand, other cases you should hit. The reason for doing this is that 4, 5, 6 dealer mean he probably has a stiff hand, and it will lead to a bust, and therefore it’s probably better to wait for that, then to risk your own busting. But if the dealer has any smaller card showing chances of busting are much smaller, so you should hit, and go for it.