Chekhover is equal at best. In the line I showed above, black scores significantly better.
It's as if it's an Accelerated Dragon, Maroczy Bind except white is down a tempo and the knight is on f3 where it blocks the f pawn.
The Prins is very flawed. The idea is to play a Maroczy Bind by defending e4 with the pawn inatead of the knight. The issue is that this doesn't work. The knight doesn't just defend e4 but it also covers d5. Omitting it allows black to conquer the whole entire centre.
This is a classic "Sicilian gone wrong for white" where black has mobilised their central pawn majority to great effect.
Yes, but after c3 cxd4 Black's passed IQP will need to be guarded at all costs, and White can equalize with this line.
He's overexaggerating as depending on what you play, that list is cut down massively. If you play the Najdorf then you basically just have to play
And, if you play Nf6 against the Alapin, you can, if you like, remove the Smith-Mora from that list and simply make White transpose into an Alapin (1. e4 c5 2. d5 cxd4. 3. c3 Nf6). You can also learn the theory and feast on the extra pawn, but you don't have to if you're looking for ways to make make the task more manageable, at least for starting out.
I guess that, in addition to the two you added in your next post, you could add the deferred Alapin (1. e4 c5 2. Nf3 d6 3. c3), which has to be handled a bit differently from the regular version, though it's not particularly challenging.
Oh, and there's one other sharp try Najdorf players need to know about, Carlsen's 1. e4 c5 2. Nc3 d6 3. d4 cxd4. 4. Qxd4 Nc6 5. Qd2, where White's plan is to play b3 and castle long. (Of course, it depends on whether you really do play 2. ... d6 in response to 2. Nc3. If you instead play 2. ... Nc6 you don't have to worry about this, but then you can get move-ordered into a Rauzer.) (2. ... a6 is also an option.)
And, for similar reasons, the Grand Prix can be a bit tricky for Najdorf players, if they stick to their guns and answer 2. Nc3 with 2 ... d6, since Black has better responses to the Grand Prix after 2. ... Nc6 (essentially, waiting until you can play d5 in a single go) but that means allowing White to play an open Sicilian you may not want.)
There are various oddball moves as well (I saw 5. Bd3 *twice* yesterday!), but it's rarely hard to figure out ways to get a good position against them. (For instance, 5. Bd3 blocks the queen's control of the knight on e4, so you can just go Nc6 and make White spend a tempo figuring out what to do about their knight.)