Few questions about Evil Islands Engine

[IDoL]

Ok... And another question to this. Where I have to put backstub/strenght/weakness in this formula to get real damage? What is the value of backstub on any level?
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Well, I`ve simplified this formulas.
Actually, magic damage formula isn`t so simple. Here is protection from magic spells, weaknesses and strengths.
So, as I remember, backstab_lvl1 is 5*Damage, lvl2 7.5*Damage, lvl3 10*Damage.
I don`t know how actually strength and weakness modifier calculated.
As result something like that: backstab*other_modifier*Random(min,max) - Armor
If you hit mob in face backstab modifier equal to 1. Something like that.

For real formulas you can:
disassemble(it`s illegal) game.exe and find this part of code.
pass through many tests with different and same conditions, collect statistics, and investigate it...

In this formula... What is random? I mean... For example I have 60 Attack and Mob has 40 Defense. 60-40*What? 0? 10? 100? And I have assumption that hit chance depends on weapon... Warrior with 20 attack more than defense of mob is hitting much more frequently than Archer. Archer has to have something like 40-50 Attack more than mob to hit in rate similar to warrior which has 20 attack more...
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So... It looks like I`m wrong. EI game system have some similarities with DnD and there:
if Attack_modifier+Rand(0,20) >= Defense then hit.
But actually EI can use something like
if ((Attack*modifiers)/Defense)*Rand(0,1) >= 1 then hit.
Maybe not. Who knows?
Archery and Melee are different skills...
You can see that different weapons have different skill modifiers.
Dexterity improvement gives one skill points in attack and defense by any additional dexterity point more then 25(and penalty if less).
I don`t know any other hit chance modifiers for weapons.
Also different weapons have different speed (as I remember).

Someone have an opinion or formulas itself?
Just interesting - why real formulas is so important?
All this text is just unproven words. Only my vision of this stuff.