Hi Brad,
I'd like to take a stab at some of your inquiries and please correct me if I'm mistaken at any point...
All the literature and websites I've seen suggest that clumping, itself, is something that is not exploitable. What I mean is, if you see 3 10's come out, you can't just assume that a fourth 10 will also come out. However, this doesn't mean that "clumping" doesn't happen. Shuffle-tracking is a derivative of clumping. You follow a "clump of high-numbered cards" through a shoe and a shuffle and try to cut the cards to a place that's favorable to you. Often, shuffle-tracking is employed in multi-deck games (6 and 8D games), though several authors suggest that many casinos have taken steps to eliminate shuffle tracking (by employing a more sophisticated, or as you've pointed out, shuffling machines).
As far as 2D games are concerned, I mainly play 1D games, since as is often the case, 1 and 2D games have similar rules and the addition of the 1 extra deck means I'm losing .38%, assuming Vegas rules (according to "The World's Greatest Blackjack Book"). As far as learning BS for the 2D game, check out this link:
http://www.blackjackinfo.com/bjbse.php . You can use your 6D BS on a 2D game and lose very little in terms of EV--you won't notice the difference. The penetration for the game you mentioned, though, seems poor. One deck dealt out of two is 50% penetration: I doubt many counters would play that game.
Anyway, hope this helps!
-C
are there games where clumping may be practiced ? multi deck games ? or is absolutley not done in the industry ?
I have recently discovered a 2 deck automatic shuffler game not far from me. I have not had the opportunity to play 2 deck before and would like to try it. What are the differences in basic strategy between a 6 deck and 2 deck game ? also i observed the penetration to be about 1 deck . is this good for a 2 deck shoe ?
BradRod