Wow this has become an interesting discussion:
First a post on the merits of 2...Nc6 3.Nc3,Bc5 a variation which has a strong connection to both the Vienna and the KG-declined 2....Bc5. White has a choice between 4.Nf3 and 4.fxe
4.Nf3,d6 The fact that Black has not yet committed himself to ...Nf6 makes an interesting difference to the usual KG-declined 2...Bc5 lines.
(A) 5.Bc4,Bg4 (5....Nf6 is a direct trans to the main line 2...Bc5) 6.d3, (White reached nothing with Na4 in Forster-Smyslov) 6....., Bxf3 (6...Nf6 7.Na4! is somewhat better for white) 7.Qxf3,Nd4 And now if the queen returns to d1 or f2 Black is more than all right. The unsolved question is if White could play like the Chigorin line of the 2...Bc5 variation: 8.Qg3!?,Nxc2+ 9.Kd1,Nxa1 10.fxe A position that has not occurred before.
B) 5.Bb5 Is an interesting alternative to 5.Bc4. But i would think that after 5.....Nge7 black has not much to worry about.
C) 5.d3,a6=
II.4.fxe,d6! This is indeed a well tested gambit, while the alternative 4...Bxg1 is downright bad in this particular position as was allready shown in 1907 Spielmann-Duras.
5.exd6 5.Nf3,dxe5 seems like a position of the KG-declined where white has taken perhaps somewhat premature on e5. At least it does not seem advisable for White to go after the pawn with 6.Bb5,Bd7 7.Bxc6,Bxc6 8.Nxe5,Qd4 or 6.Bb5,Nge7 7.Nxe5,0-0
5.exd6,Qxd6 6.Nf3,Bg4
and now black has compensation after both 7.Bb5,0-0-0 (or even Nge7) or 7.d3,0-0-0 8.Be2(hector-pavlovic,1989) Nf6
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