When you said 4 tactical attack, did you mean 4 different attack postures?
The 4 tactical attack values (with a red arrow pictogram) that are all based on weapon Firepower and used both during tactical attacks and tactical counter-attacks, which the game calls :
Soft Attack / Soft Defense, Hard Attack / Hard Defense.
Ok so to see if i follow. Example soft attack is X/Y, the way i always saw it was y is your soft defense value from soft weapons eg. infantry weapons etc. And Hard defense, as infantry i guess Y is defense against hard weapons like a AT or tank.
If by X/Y you mean what the game calls Soft Attack / Soft Defense, then no.
Lets say my OHQ has a defensive posture. When we talk about counter-attack, we are of course using the X value. I don't think i worded my question correctly. But in this instance, the counter-attack, the -60% penalty to attack, does this only apply to attack postures and not when counter-attacking with a defense posture? or it will apply regardless if you are the attacker or defender?
No, (and I fell in both of these traps too), you'll (usually) have during a combat round
both sides tactically attacking and counter-attacking.
Ok, right, you seem to be talking about the first Heart posture "Hold the Line : Infantry forces get +50% on defense and -60% on attack. Retreat at 80% losses." (Not sure what is the normal retreat %, but probably lower ?)
So, say during the enemy turn the enemy has tanks on operational offensive trying to attack into a hex where your RPG infantry is, which has "Hold the Line" :
During each tactical combat round each of the subunits is normally going to attack once.
(You can see these details during the combat by clicking the Details button on the bottom right, but obviously not when you're on operational defensive during the enemy turn.)
A subunit that has been attacked then (not always ?) gets a chance to counter-attack.
During an attack (or counter-attack) one of those 4 tactical attack values is going to be rolled against one of the two HP values (Which are based on Armour Strength - AFAIK both HP values are the same for all soft armor units ?)
So since the tanks are on the operational offensive, during an attack or counter-attack they're going to use one of the 2 of their Attack values.
Since your RPG infantry has soft armor, it's going to be the Soft Attack one.
Your RPG infantry is going to use its HP value to tactically defend.
So the Tanks' subunit Soft Attack (after all modifiers are applied) is going to be rolled against your RPG infantry subunit HP (after all modifiers are applied, like entrenchment).
And in the other direction too, the same thing is happening in the same combat round :
Since your RPG infantry is on the operational defensive during an attack or counter-attack it's going to use one of the 2 of their Defense values.
Since the Tanks have hard armor, it's going to be the Hard Defense one (which infantry RPG is the best at !).
Their Tanks are going to use one of their two HP values to tactically defend.
(Now this is the part that I haven't tested yet - only on towed Howitzer arty against Tanks - but I *think* this is what is happening ? : )
Since RPG infantry has a *soft* weapon, the tanks are going to use their Soft HP value to defend. (Which they generally - though Side Skirts might change this - have a penalty at !)
So your RPG's subunit Hard Defense value (after all modifiers are applied) is going to be rolled against the Tanks subunit Soft HP value (after all modifiers are applied).
And here's where the Hold the Line posture comes in : You're going to get an *extra* +50% modifier on that Hard Defense value, so an extra x1.5 multiplier, which is going to increase your chances to hit the tank !
(And *maybe* also, if the tank is hit, to increase the chances to have it be a Retreat hit or even Killed hit than just a Pinned hit ?)