"Yes, it is 6 decks."
OK.
"In this BJ variant, using the example of a 2 card total of 20, I have the option of placing the ‘double up wager’ (equal to my original bet - pays 1/1). If however the dealer makes 20, I lose the double up wager and push the original.
Sounds too good to be true. He obviously won't make 20 more than about 40% of the time. So, you lose one unit 40% and win two units 60%. Why wouldn't you want to do that all day long?
"So for every situation of a 2 card 20 vs 10, I stand to win 2 units (original 1 unit, double up wager 1 unit) if dealer makes 19 or less or lose 1 unit if the dealer makes 20."
No, you also win the two units if he breaks his 10, no? That happens 23% of the time!
Don