[Comment "auto-generated from 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[Event "Alburt 10.dxe6 h6...12...Na6 mainline-2"]
[Site "DEIO - FCUL"]
[Date "2008.09.22"]
[Round "?"]
[White "Luis1"]
[Black "Luis2"]
[Result "*"]
[ECO "B04"]
[Annotator "Luis"]
[PlyCount "40"]
[EventDate "2008.??.??"]
[SourceDate "2008.01.01"]
[TimeControl "240+2"]

{159MB, Fritz11.ctg, DEIOFR} 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 5. Bc4 Nb6
6. Bb3 Bg7 7. Ng5 e6 8. Qf3 Qe7 9. Ne4 dxe5 10. dxe5 h6 11. Nf6+ Kf8 12. Qc3
Na6 13. Be3 {probably not as threatening as in the other the variants where
Black plays a different move 12, since here, Black controls the c5 square with
the knight on a6} (13. f4 {H0.32/K0.43} Nd7 {H0.41/K0.53} (13... Qb4 {H0.52/K0.
65 TA}) 14. Nxd7+ {H0.26/K0.50} (14. Ng4 {H0.19/K0.46 TA}) 14... Bxd7 15. Be3
Kg8 16. O-O {and we transpose to the line starting with 13.0-0}) 13... Nd7 {H0.
31/K0.55} (13... Nd5 {H0.45/K0.50 played by Komodo8 and Rybka3; possible due
to the knight "covering" c5; however we observe that this line become
"innocuous" if White plays 13.0-0 first} 14. Bxd5 {H0.35/K0.49} (14. Nxd5 {H0.
20/K0.29 the disadvantage of this move is that after} exd5 {White needs to
defend the e5 pawn with} 15. f4 {and now after 15...Be6 or even 15...c6
followed by Kg8 Black is close to equal} ({the apparently reasonable} 15. Bxd5
$2 {is a mistake since after} Bxe5 16. Qb3 c6 {White has no good place to put
the bishop due to the weak b2 square, e.g.,} 17. Bf3 (17. Bc4 b5 18. Be2 Be6
19. c4 bxc4 20. Qc2 Nb4 21. Qc1 Bf5 $19) 17... Be6 18. c4 Nc5 19. Bxc5 Qxc5 {TA
})) 14... exd5 {this position differs substantially from the one obtained
after 14.Nxd5; here the knight is preventing the black king from fleeing to h7}
15. O-O (15. Nxd5 $6 Qxe5 $11) 15... b6 {H0.47/K0.51 played by Rybka3 and
recommended by the engines; the variation to analyse if Black chooses 13...Nd5}
({the pawn sacrifice} 15... c5 {H0.50/K0.45 gets two bishops for two knights
but after} 16. Nxd5 Qxe5 17. Bxc5+ Nxc5 18. Qxc5+ Kg8 19. Nbc3 Kh7 $14 {it is
not clear that Black has compensation for the pawn; but the opened position
gives some power to the two bishops}) (15... Be6 {H0.58/K0.68} 16. b4 $16) 16.
Qc6 {R0.46/H0.48} (16. f4 {R0.40/H0.26}) (16. Nxd5 {R0.39/H0.35} Qxe5 17. Qa3+
$14) 16... Rb8 17. Qxd5 {R0.47/H0.33} (17. Nc3 {R0.50/H0.48 played by Houdini3}
Bb7 18. Qa4 Rd8 {H0.33/R0.40} (18... c6 {H0.44/R0.22}) 19. Ncxd5 {R0.39/H0.40}
(19. Rad1 {R0.36/H0.33}) 19... Bxd5 {H0.27} (19... Qxe5 {H0.65} 20. Bd4 $16)
20. Qxa6 {H0.25} (20. Nxd5 {H0.00} Rxd5 21. Qxa6 Bxe5 22. c3 c5 $11 {with the
idea of playing Kg7 and moving the queen to c7 if white plays a rook to e1})
20... Qxe5 21. Nxd5 Qxd5 22. c3 Be5 $11 {Houdini3-Rybka3 1/2}) (17. Re1 {was
tried by Fritz13 perhaps with the idea to undirectky defend e5; however after}
Nb4 18. Qa4 Bf5 19. Na3 {R-0.03/H-0.06} (19. Qxa7 $6 {R0.00/H-0.13} Rd8 20. Na3
d4 {anf Black might even be slightly better}) 19... c5 {= Black has equalized
although with still a lot to play, Fritz13-Rybka3 0-1}) 17... Bb7 {R0.41/H0.33
preferred by the engines but giving a pawn} (17... Nb4 {R0.52/H0.42} 18. Qd2
Bf5 19. Na3 Nc6 $14 {and Black recovers the pawn but I think White has a
minimal advantage}) 18. Qd4 (18. Qd2 {transposes}) 18... Rd8 19. Qc3 {White
keeps the pawn but the engines give a nearly equal game}) 14. Nxd7+ ({as
mentioned before, by transposition, the move} 14. O-O $2 {is not an option
since after} Nxe5 {15.Bc5 is not possible due to the knight on a6 and White
simply loses a pawn}) 14... Bxd7 {possible due to the knight on a6;} 15. Nd2 {
15.f4 or 15.0-0 may transpose to main-line1} (15. h4 $5) 15... Kg8 ({as in a
similar variation discussed in main-line 1} 15... Qb4 $4 {is blunder due to}
16. Qxb4+ Nxb4 17. Bc5+ $18) 16. a3 {since Black can now try Qb4 or Nb4} (16.
Ne4 $5) (16. Bc4) 16... Bc6 (16... Kh7 $2 {may be too early since White has
not yet castled; after} 17. h4 $16 {White has a strong attack}) 17. O-O (17. h4
$5) (17. Rg1) (17. f3) 17... Kh7 18. f4 Rhd8 19. Nf3 Bf8 20. Nd4 Be8 (20... Bd5
) *