: So I was wondering if, while digging through the game's code, you've ever run
: across the exact formula Halo Wars uses to determine Combat Efficiency and
: Bonus Multiplier in the Post Game Carnage Report. I've never seen an exact
: explanation, the best anyone can seemingly do is say it's based on
: kill/death ratio of units and buildings, and possibly even the cost of the
: those units in Supplies.

: It'd be great to have the actual formula in order to see whether seeking out
: high cost buildings and units is really more beneficial, or if it's based
: on population kill/death. This would be helpful in learning exactly what
: kind of strategy is most best for upping the multipliers and get that
: "Running The Show" achievement faster. :)

I just looked into the game's BScoreManager asm code. The 'Combat Efficiency' score is calculated via the total 'killed' combat value divided by the total 'lost' combat value, then normalized in the combat bonus range (which is by default 0 to 5; none of the map scripts override this).

To give some examples of various object combat values:
Buildings (typically): 10
Turrets (not upgraded): 12
Turrets (upgraded): 14
Cobra: 14
Scorpion/Grizzly: 20
Hornet/Hawk: 10
Scarab: 120

Typically, an object's 'bounty' is the same (or near) as their combat value (bounty is what builds veterancy). Eg, the hunter's CV is 4, but its bounty is 5. Chieftain's CV is 30, bounty is 60. Scarab's values are both 120.

Consider the tank's CV of 20 to the Hornet's 10. If you take out a tank, that's +10 'killed' for you and -10 'lost' for the enemy. So building an entire army of tanks is not only extremely freaking stupid war wise (air beats vehicle), the Hornets have a lower combat value than your tanks. Meaning they have less to lose. Hornets are cheaper, train faster (IIRC), don't raise enemy veterancy levels faster, and don't hurt your Combat Efficiency rating.