12 v 4 is a very significant hand, a member of the Illustrious 18. 2 card CD indices for the hand are well known. A more detailed examination of the hand (a mean 3 card index, for example) has not been performed, to my knowledge.

The 2 card CD indices (SD) of the hand are as follows (Professional Blackjack; Zenfighter): 10,2:+2; 9,3:0; 8,4:0; 7,5:0. The mean index of the hand is 0.

Note that 10,2 is a much more common hand than the other 2 card indices.

Is it possible that the mean 3 card index is a negative one, since the mean index is 0?

-2 or thereabout, perhaps?

If so, this would be a valuable CD index.

I hope someone on the site shares my interest.

JL