Match Play 21

Bovada, in their downloadable casino software, has a game that's Spanish 21 with the serial numbers filed off - they call it "Match Play 21" (after their name for Super Sevens, which they pay 40:1) and there's one important difference, possibly two: you can surrender with any number of cards (I've tested this), and the rules say that 21 doesn't pay against a dealer blackjack (I haven't managed to get into this situation, and the rules for craps also say it rounds down to the dollar, when it actually rounds down to the quarter, so I'm not sure how much stock to put in this). The latter rule is probably an increase in edge of slightly less than 1.5/576 = 0.26%, if it applies - I'm more interested in the former. What does it do to the edge to be able to surrender after any number of cards, and how many cards do you need before it's better to hit 16 and 17? (The game is H17.)

Quote: 24Bingo

...What does it do to the edge to be able to surrender after any number of cards, and how many cards do you need before it's better to hit 16 and 17? (The game is H17.)

I find that the house edge decreases by 0.017% with the surrender after any number of cards rule. Also, I find that against an A, you should surrender 17 with four or fewer cards, and surrender 16 with three or fewer cards.

Thanks.

Update: I've now played enough to find that, yes, they do pay out blackjacks if the dealer gets one, too. (But they still offer insurance... huh.)