Kontakt-5

Reading between the lines is necessary.  Then you fudge.

Kontakt-5 is an explosive reactive armor that actually works on KE rounds.

That's handy!

Kontakt-1 and Blazer sure don't.

The difference is that instead of a thin sheet-metal box with a thin plate at the bottom; Kontakt-5 uses a thick plate on the top.

When the nose of the KE round hits the explosive in the base of the box, it blows off the plate when the penetrator is about half way through it.

That does bad things to the penetrator.

Inferring the performance of this second generation of reactive armor comes from reading about the bragging about third generation reactive armor's performance.

From reading about 3rd gen stuff, it would nullify the armor divisor on AP rounds.  Changing the (2) to (1).  (1) is a normal bullet...

They phrase it as doubling the effective thickness of the armor.

3rd gen is supposedly twice as effective as 2nd gen...  Or that the armor is, effectively, 50% thicker against KE rounds with the 2nd gen.

So, Kontakt-5 nullifies the special effects of HEAT and HESH, changes the armor divisor of KE AP rounds from 2 to 1.5 and changes the armor divisor of the second charge of a tandem warhead from 10 to 5.

There!  Now I have a working rule.

I am happy!