Yeah 3e is simpler alright.
Well, let's see.
As a 6th level thief, my THAC0 is [check table] 19. The ogre is AC 5, and the Weapon Type vs AC Adjustment factor of a two-handed sword is [check table] +2, so that's a total of 19... except that I'm a thief, so my non-proficiency penalty is [check table] -3, for a total of 16. So I hit AC 3 - a hit!
My damage is 3d6, because the ogre is Large, rather than 1d10 if he were Small or Medium.
The ogre has 4 hit dice, so his THAC0 is [check table] 15. My AC is 4, but my AC
type is 8 (leather armor, no shield). Fist vs AC type 8 is a [check table] +2 modifier.
You know, it's crazy using a two-handed sword I'm not proficient with. I'll drop it and try to pummel him. So, let's see, once we determine initiative, I determine my Variable Applicable to Pummeling Attacks. The colum I use for weapon attacks as a 6th level thief is [check table] the second column, 5-8. As the attacker, then, I take that number, 2, and add a secret 1d6. [roll] Total of 5.
I determine my Base Score to Hit. That's his AC x 10, or 50%. That's modified by my Dexterity modifier (+2); my Strength, per point over 15 - no good there; my AC, per point, by type - my AC by type is 8, so that's +8; and the ogre's base move over 12" - he only moves 9", so no modifier. Total chance to hit : 60%. (I can add my Variable, 5, to that number if I want, but I need to decide that for each attack.)
So, for this round, I'll save my Variable for if I'm successful. Roll - a 43. Below 60%, I hit! So, I roll percentile to see the result - a 28. I add my Variable, 5, for a base of 33%.
That's modified by my Strength, per point over 12 - 14 is +2%. I'm wearing a gauntlet - +5%. Modified by Defender's dexterity, per point over 14; oops - I don't know what an ogre's dexterity is. But it's probably not over 14. And the armor the ogre is wearing. Well, he's not, but he's got thick skin... treat it as studded leather, maybe? So that's -20%.
Total is 20%. Consult the table - Ineffective blow, no damage, but I get to strike again...
Hooray for the simplicity of 1E!
-Hyp.