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You always subtract the target's AC from the attacker's THAC0 to find the required successful minimum roll. (Or, if you like, add the AC to the roll before comparing to see if you match or exceed the THAC0.) If your THAC0 is 18, you need an 18 or higher "To Hit Armor Class 0." If your enemy's AC is 10, you only need to roll a 8+. If your (very well-protected) enemy's AC is -3, you need to roll (18 - -3) a 21+.
Why can't we just play the game naturally?
Every attack made in the game is decided by a D20 (20-sided dice), if the roll match or exceeds the attackers Thac0 it's a hit. That's why a big Thac0 is bad, you have to roll higher to make it a hit.
The defenders AC is always added to the roll. So if the enemy has 2 AC, your roll of 14 against it becomes a 14+2=16 that is then tested towards your Thac0. If AC is negative, the addition effectively becomes a subtraction. A -2 AC would make a roll of 14 into 14+(-2)=12.
Again, I think your explanation might also be correct/helpful. I was just confused about the way you do the math. ^^"