Question about "True Edge" (Arnold Snyder)

I have a question about the concept of calculating the "true edge" with unbalanced strategies.

In Snyder's book (Blackbelt in Blackjack) he discusses "true edge." He states: (Page 65 in my copy) that the true edge is the running count divided by *twice the number of decks remaining to be dealt."

My question relates to how he came up with the "twice the number of decks remaining to be dealt." The origin of that is not explained, to the best of my knowledge.

I note that his example is used with his "Advanced Red Seven Count." With that system, the IRC is 0 - (2*number of decks). Example, a six deck game has an IRC of -12.

However, what if you are using an unbalanced system in which the IRC is 0 - (4*number of decks)? In short, the IRC for the system I use (6 decks shoe) is -24.

So, back to true edge. Will the "true edge" divisor change with my counting system? In short, will the divisor be something like *four times the number of decks remaining to be dealt*? Or something else. Or do I still multiply by 2? Again, Snyder does not seem to explain how he derived the "twice the number of decks remaining."

Thanks,
Terry

I assume it has to do with the numbers you're adding and subtracting from the running count.

If you were doing high-low with +- 2 instead of +- 1, then you would have to divide by 2*decks to get the same true count.

is to make each 0.5 worth of change of True Count to equal your estimate of an 0.5% change in advantage. To do that you have to divide the RC by half-decks remaining.