Fallen Kell
Diamond Member
- Oct 9, 1999
- 6,240
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The thing that was really annoying about it to me was that AC started at 10, but it's THAC0? Why 0?
Because it made the math easier to do when you were playing by pen and paper. Lower AC is better, so if you have an AC of 10, then you simply add the AC (in this case 10) to your 20 sided dice roll (plus any bonuses you have for the attack from your weapon and situation, and subtract any modifiers that the enemy may have), and if the number is equal to or above the THAC0 value, you hit the enemy.
And if the enemy has an AC of -4, then it is the same calculation, D20 + (-4) + (bonuses/modifiers) => THAC0 = hit; else miss.
If you changed where they started from, the calculation would be more time consuming. For instance, if it was THAC10, D20 + (AC) + (bonuses/modifiers) - 10 => THAC10 = hit. So you just subtract an extra 10 into the calculation that is not needed if it was THAC0.
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