BroccoliRage said:I'm not familiar with OD&D, I understand B/X though. The original D&D is something I have had no exposure to. I cut my teeth on 1e.
I love B/X D&D. It's a superior system. I learnt from Moldvay BD&D and AD&D 1e at the same time. (This was about 1982). Moldvay did a great job of teaching the basics of being a DM - something that isn't in AD&D. Gary's speaking to a more experienced audience.
What I meant regarding all the games being the same is, since were eliminating the details between editions, that every rpg i have ever played has consisted of rolling a die and trying to hit a pre-determined target number, whether that be high or low.
One day, try playing Lace & Steel, if you can find it. It's a great game, with an ingenious card-based combat system.

If you reduce a RPG system to "roll a die and you succeed or fail", then - yes - RPG systems do begin to look similar. However, when you look at things slightly more closely, you notice some striking similarities or differences.
For the moment, I'll ignore saving throws (they changed significantly in the details between 2e and 3e). I can use a 2e monster in a 3e game with only two changes to the stats.
Let's take an Ogre.
AC 5, HD 4+1, THAC0 17, #AT 1, D 1-10.
To transform into a 3e creature - AC is 20-AC.
AC 15
Attack bonus is 20-THAC0
Attack +3 (1d10)
There you go.


Obviously, it's weaker than a 3e Ogre. Why? Ability scores. The prime difference between 3e and previous editions. (Funnily enough, a 2e ogre wielding a greatsword would convert to 3e as Attack +5 (1d12+6) - it only uses its strength bonus to hit & damage when wielding weapons!)
There's a fascinating example in BECM D&D of the use of ability scores. In B/X D&D, monsters don't have ability scores. Unfortunately, with the Master rules, they added the maze spell, which requires you to know that target's Intelligence. Oops. So, in the Master book, there's a table listing all the monsters' Intelligence scores from each of the previous rulebooks, just to allow this one spell to work. Go figure.

3e is greatly removed from oD&D as to its system, but much less so when compared to 2e with Player's Option. There is a clear line of descent through the previous systems, as well as mechanics that are obviously still inspired from the optional combat system of OD&D. (The default combat system in OD&D used the Chainmail tables... and no hit points! You either were killed by a blow or you were fine!)
The functioning of AC, the d20 attack roll, Hit points and basic spells such as magic missile and fireball are recognisable throughout the editions.
Cheers!