Switch to KO and learn TCRC (Table of Critical Running Counts).
A true counts of 4 occurs when KO = 4*n where n = # of decks is exact and is independent of decks played or decks remaining.
For true counts near the pivot of a true count of 4, the KO is very insensitive to errors in estimating decks played.
For example, at tc = 5, KO is only one true count point away from its pivot of a true count of 4 whereas HL is 5 true count points away from it's pivot of a true count of zero. So with the KO and tc = 5, estimating to the nearest deck is equivalent to the HL estimating to the neatest (1/5)th of a deck.
I am attaching a 4 page PDF that shows that TCRC for six and eight decks. Also note the pattern in the table so constructing the table mentally is very easy.
Just know the TCRC and forget about true count calculations (just mentally look up the true count in the TCRC from the KO running count and decks played) and your estimating of true counts for true counts of 3, 4, 5, and 6 which are most important for betting and playing strategy variations, will be very accurate.
For the KO with tc > 3, estimating to the nearest deck is more than adequate.
Besides the 4 page TCRC I am also attaching an exhibit that shows the TC accuracy of HL vs KO.
Finally the HL and KO indices are very close and you can use the HL indices for the KO count with very little error.
KO and TCRC.pdf
KO TC accuracy.pdf
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