Not that this is highly relevant for most, but KO works quite nicely with quarter deck estimation. That's because the (unbalanced) count needs to rise by 1 for each quarter deck just to stay at TC of 0. So if you're tracking quarter decks, you always know if your TC is greater or less than 0.

But you also need to know your RC multipliers for each quarter deck increment. So for instance, after 1/2 deck has been dealt, TC 0 is at RC +2. If at that point the RC happens to be at +4, then you are at TC +1.33 ((4-2) x .66).