My next door casino just introduced SHFL's Single 21(TM) and I was curious if anyone figured out BS and advantage play for this game? Here are the printed rules (single deck game):
Double down on any number of cards.
Surrender anytime, unless the dealer has blackjack. You can even surrender after hitting and doubling down.
Split up to four hands.
Splitting after hitting. Whenever two same-value cards are touching, you can split the second off and start a new hand. You can even split after doubling down. You cannot split to prevent busting.
Player blackjack always wins.
Suited blackjacks pay 3 to 2. Unsuited blackjacks pays even money.
Automatic winner if player receives six cards without busting (unless dealer has blackjack).
The catch is BJ is reduced to even money unless it is suited.
I am attaching a link that I found on the web, and I'm not sure if these are the same rules.

