I have no idea what GreyLord is talking about. The first printing of S&W is very clearly based on LBB D&D. The "white box" edition retains the d6 hit die progressions for all classes, while "Core" and "Complete" use Greyhawk (not B/X) hit dice (just to cite one example). There's an elf class given in the "white box" edition, but (like all the house rules in S&W) it's clearly labeled a "variant" and an alternative to the original rule (FM up to 4th/MU up to 8th).
The one I downloaded years ago was ABSOLUTELY based on B/X or BECMI. The creator obviously THOUGHT they were creating it off of OD&D or what they THOUGHT was OD&D, but it was not. It had race as class for starters.
I raised a fit about it.
I'm not sure if my statement was what changed it, or what happened, but it DID change. The white box today is NOT the original that was released originally.
They weren't the only ones, if I recall, but others changed what they stated while S&W changed the game and pretended it was like that all along. IT IS now like what it claims, but originally, I WAS MIFFED when I downloaded what I thought was an OD&D claim and it was anything BUT that. That original feeling actually sort of irritates me to this day with S&W because there's never been any apologies or anything to those of us who got caught in that.
IF OD&D has more OSR games based on it, it COULD be that some of them were the miffed downloaders of the original S&W who WANTED an OD&D clone but got something other than that (no evidence that this is the case, but it would not surprise me).
NOW, S&W is probably one of the bigger OSR games that IS based off of OD&D though.
PS: NOW some say that the original download was different, NOT because it was not based on OD&D, but due to many houserules they added in and put into it rather than keeping it true to the original. IT MAY BE that this is true and what drove me to think it was based on something different, because the way they had put items into it and houseruled items MADE IT APPEAR more as a BX or BECMI document than an OD&D document.
A prime example is the elf variant where you have the elf advance as a fighter and magic-user (like BX or BECMI) at the same time. Others that came out would be other variations that made it closer to BX than OD&D. it was an odd mix that definitely did NOT ring the OD&D bell for me. I HEAR it has changed to be more representative of OD&D these days (I admit, I was so upset with the initial d/l that long time ago that I've never downloaded S&W again), which I accept. I just didn't like it giving that false sense of being based on OD&D when it had so many differences that seemed to me more akin to BX or BECMI than OD&D.
If the original document reminded me of BX, the CORE RULES seemed they were absolutely based on BX or BECMI. They had Elf as class, Dwarf as class and various other BX or BECMI isms. It seemed blatant...BUT, I have read that some claim that it was only houserules (houserules that were suspiciously a LOT like BX or BECMI) that the makers had added in to S&W early on.