Hello Mnb&Uberdeker,
Yes, maybe Bricard's variation is more appropriate than Eingorn's variation, but naming variations is difficult ("the first player playing the move ? the first strong player playing the move ? the first player building an opening system with it ?" and so on).
I add that I had the luck to listen Bricard in a training lesson in Toulouse few years ago, about the variation. He explained the ideas and one main idea is "h6 is a waiting move". Eingorn used Bricard's idea and developped later a system with in, and specially with the Nc6 move. The idea is, if White plays an "universal system", then White will not choose immediatly between closing or opening the center (e5 or exd5), then Nf3-Bd3 are the moves. But after Bd3 then Black has Nc6 hitting the bishop on d3, and if White wants to keep his very-good bishop, then one tempo must be lost.
Maybe I repeat the analyse in NiC, I don't know (because I have not read the paper about the variation).
Now, about the sub-lines...
A) Maybe it's a matter of taste, but c6 is another pawn move and White after the exchange exd5-exd5, two tempi more for the development and I clearly prefers White in such position. The idea of Bb4 is to win the good square "e4" and to develop quickly (the same idea exists in the Wiawer-exchange without h3).
B) The two-knights's variation is one sub-variation of the French where White delays the d4 pawn move. It's useful to know it for White players playing Nf3 or wanting to avoid some variations (White can choose later between the exchange or a closed game, and avoid the Winawer); 1.e4 e6 2.Nf3 d5 3.Nc3 two-knights variation (Taulbut) Nf6 4.e5 Nfd7 5.d4 c5 6.dxc5 Nc6 7.Bf4 Bxc5 8.Bd3 f6! (8...h6?! an error of a world champion, since now Black is weak on light squares and cannot play f6 easily. Gufeld-Spassky-Leningrad 1960)
C) Versus Kf6, White plays the universal system Bd3...but I admit Black can play such move. Without deep analysis, I will play with White: 5.Bd3 c5 (5...Nc6 6.e5 Nfd7 7.oo and now the idea Nb4 doesn't work 7..Nb4 8.Be2 c5 9.Nb5! a6 10.Nd6+ Bxd6 11.exd6 += ; 5...dxe4 is a kind of Rubinstein with the useless(?) move h6) 6.oo.
If 4...Nc6!? 5.e5 then Black has no immediate counterplay but an easy and quick development for his pieces: Bb4-Nge7-oo. The attack against the space advantage is done later with f6 or Ng6-Nce7
E) After 6.Qxg7 Rg8 (6...Rh7 7.Qg3 dxe4 8.Bf4) 7.Qxh6 Nxe4 8.Ne2 and I don't see Black counterplay in the center, and White now has a dangerous h pawn in the future.
F) In some lines in the Rubinstein, Black can exchange more pieces because White has played Bg5. Here, the pawn move a3 has been played, and White can keep his space advantage or control: 4..dxe4 5.Nxe4 Nf6 6.Bd3 Nxe4 7.Bxe4 Nd7 8.Nf3 Nf6 9.Bd3 c5 10.Be3 or (Fort Knox's variation) 6...Bd7 7.Nf3 Bc6 8.Qe2 Bxe4 9.Bxe4 Qxe4 10.c6 oo
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