Speaking of DD
In addition to being unable to find hi-lo indices specific to the DD game, I also had a problem with the way indices are calculated, which can best be summed up by the following question:
How often do you get a +2 count out of a 2-deck shoe with exactly 101 cards remaining?
So, I first ran a program to determine the average number of cards out at each (floored) TC from -10 through +10 through -0, =0 and +0 assuming the cut-card placed 47 cards from the bottom and burning the top card (i.e., 55% pen). "Minus zero" means a negative RC with a TC > -1; and "plus zero" means a positive RC with a TC < +1.
Then, for each of the 23 TCs, I reconstructed the average distribution of the remaining cards BEFORE the 3 cards in the player's hand and dealer up card were dealt, then removed these before running every possible player combo and every possible dealer combo and recording and accumulating the win, lose and push probs.
To keep a long story from getting longer, here were my results:
At low magnitude counts (either + or -, but closer to zero), the indices are very close to those for the 4D game.
At high magnitude counts (far from zero; e.g., +8, -9) the indices are very close to those for the SD game.
For example, for 12 vs 2, the SD index is +5 and the 4D index is +3. The average is +4, which is of "medium magnitude," so just split the difference and use "stand at +4." This happens to be the correct index for the average number of cards remaining when the floored TC is +/- 4.
Another example: 16 vs T. The SD index is -1 and the 4D index is 0. The magnitude of these counts is very low; so use the 4D index (i.e., hit at any negative RC, stand at an RC of zero or greater [except on the first hand out of the shoe, of course, when you would use BS]).
The reason for this is the difference in the average number of cards remaining at each TC. Low magnitude counts occur, on average, when there are more cards left and high magnitude counts occur, on average, very close to the cut card.
I hope this is useful to other DD players.