What qualifies as a BlackJack - various rules by site?

"In fact, quite a few times (and at major casinos) - i have seen the person splitting 10's getting BJ on both hands."

No. No, you haven't.

A "Blackjack" occurs ONLY on the first 2 cards. If someone splits Aces and hits a "Ten" value card on both those Aces, then that person has TWO "21s". That's it. Both hands equal a value of 21, and neither of those hands are capable of losing. They will likely both win, (unless the dealer hits to 21 and pushes), and if they win, they will both be paid at EVEN odds. ($10 for a 10-dollar bet, for example.)

If you remember seeing the person being paid for those hands as a Blackjack, (and getting paid 3/2 on both hands), there are only 2 possible reasons:

#1 - Most likely is that you remembered wrong. No casino has this as a Blackjack.

#2 - The dealer made a mistake and paid out too much. (Very unlikely.)

***EDIT***

"are you claiming that right after a spit you do not have 2 1-card hands?"

Yes. That's what I'm claiming...sort of. You do not have 2 unique "beginning of the game" hands. It is only in the beginning of the hand, when the cards are first dealt, that you can get two cards that can be called "Blackjack".

I'll just give you one source that I found that has Blackjack rules. Search for other places and you'll always find the same answer. "Blackjack" is ONLY on the very first two cards dealt.

The source below further explicitly explains that after cards are split, it cannot be called a Blackjack if you get to 21 with 2 cards.

"I asked for SPECIFIC RULES not opinions. thanks RULES in writing."

Good. That's what I gave you. Again, if you saw this, it was because a mistake was made by the dealer.

I have never seen it, but that doesn't mean it never happens. I will say, if a casino DOES pay 3:2 in this case they are doing it purely to try to lure you into splitting your 10s.

In other words, they are trying to make you give up a hand that is an almost certain winner for a hand that will be a long-term loser. Or at least to get a push instead of having to pay you.

If you assume a never-ending deck, the odds of getting an ace on your next card is less than 8%. In other words, one time out of 13 you will gain an extra 50 cents on the dollar.

You have a higher probability of splitting yourself into a losing position. You're much more likely to get a 2, 3, 4, 5, or 6 than an ace. In the long run, this is absolutely a money-losing choice.

If you are playing a single-deck game, there is no way the casino will offer this rule.

A blackjack is when your first 2 card and ONLY your first two cards are an ace/ten value combination.

Whether you split 10s and aces and get it it wont matter.

Dealers make mistakes all the time and maybe that is why you saw someone get paid a blackjack for a split ace getting a 10.

Splitting then getting an ace/ten combination does not count as your first 2 cards. Those are clearly your 3rd and 4th card despite the fact you made to separate hands.

I have never seen it paid as BJ on a split, and I've personally done it at a few different places.

There are no general rules, it's up to the specific casino how they do it. You'd have to look at individual places, I would guess you find the vast majority of (if not all) major casinos do NOT pay out as BJ if you hit an A on a split 10 or a 10 on a split A.

I was almost going to be the only person to agree with Harley until I saw she said the games were "fixed". They aren't fixed because they don't have to be. Blackjack is already set up as a way for casinos to TAKE your money. They don't need to cheat in order to get it from you. In case nobody has ever told you this, that is why casinos were made (whether live or on-line) - to TAKE your money! This is the truth, and this is what they will do if you play there.