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Normal Topic 10. Na3 in the Siesta as against Timman last year (Read 2549 times)
George Jempty
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Re: 10. Na3 in the Siesta as against Timman last year
Reply #1 - 11/06/15 at 20:17:18
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The game that proceeded 10.Na3 Nf6 11.Ne1 O-O 12.Nxd3 exd3 13.Rxd3 d5 14.Re3!? d4 15.Re1? is over and it was a real bloodbath for White:



At the end this is how Komodo evaluated 4 lines for Black at depth of 27:

(24...Nf6 Komodo 9.2 64-bit  -3.39 (depth 27)  25.Qf2 Qxf2+ 26.Rxf2 Nxd5 27.axb5 axb5 28.b3 Kg8 29.Ba3 Rf5 30.Bc5 Nd7 31.Ba7 Nf4 32.h3 Nc5 33.b4 Na4 34.Rb1 Nb6 35.Bxb6 cxb6 36.Kh2 Re2 37.Rbf1 Rfe5 38.Kg3 g5 39.h4 Rxf2 40.Rxf2 Re2 41.Rxe2)

(24...Nf6 -3.80 (depth 27)  25.Bb7 Ng6 26.Qf2 Qh6 27.Re1 Nf4 28.Rxe8 Rxe8 29.axb5 Qg5 30.Kf1 Qxb5 31.Qd4 Qxb7 32.Qxf4 Qb3 33.Qa4 Qe6 34.Qd1 Qd6 35.g3 Re2 36.Qxe2 dxe2+ 37.Kxe2 Qb6 38.Kf1 Qb5+ 39.Kf2 Kg8 40.Ra3 Qd3 41.Ra1)

(24...Nf6 -4.14 (depth 27)  25.Qd4 Qh6 26.Be4 Nfg4 27.fxg4 Rxf1+ 28.Kxf1 Nxg4 29.Bxd3 Qh4 30.Be2 Re4 31.g3 Qh3+ 32.Ke1 Rxd4 33.cxd4 Qxh2 34.Kd1 Nf2+ 35.Kc2 Qg2 36.Ra3 Qe4+ 37.Bd3 Nxd3 38.Rxd3 bxa4 39.d5 Kg8 40.Kc3 Qe5+ 41.Kc2)

(24...Nf6 -4.67 (depth 27)  25.axb5 Nxd5 26.Qf2 Qh5 27.Kh1 Nf4 28.b3 axb5 29.Ba3 Rf6 30.Bc5 Ne2 31.Be3 Qf7 32.Qh4 Rf5 33.Qb4 Rh5 34.h3 Ng3+ 35.Kg1 Nc6 36.Qg4 Nxf1 37.Rxf1 Rf5 38.b4 Rf6 39.Kh1 Qd5 40.Ra1 Ne5 41.Qh5)
  
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George Jempty
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Participant 1996 US Corres.
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Posts: 195
Location: Carrollton, TX
Joined: 03/29/09
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10. Na3 in the Siesta as against Timman last year
11/03/15 at 21:29:52
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In the online chessbase I can only find one game with 10. Na3 after the sequence 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5 6.exf5 Bxf5 7.O-O Bd3 8.Re1 Be7 9.Re3 e4, a game where Timman beat IM Poetsch after 10. Na3 Nf6  11. Ng5?



Timman responded 11...Qd7 and won, though another possibly simpler option is 11...d5

It appears that 10. Na3 was not an innovation though, there are a couple of games from the ICCF archives from 2013 that featured the sequence 10...Nf6 11. Ne1 O-O 12. Nxd3 exd3 13. Rxd3 d5 instead, one a draw, the other a win for White.



14.Bxc6 may not be optimal; the following win for White features 14.Bc2 instead



I had 10. Na3 played against me twice on FICGS in the past month or so, and at first I was concerned that White was a clean pawn up after the sequence 10.Na3 Nf6 11.Ne1 O-O 12.Nxd3 exd3 13.Rxd3.  In any case I played 13...d5 in both games as in the games from ICCF above, and in one game that is still ongoing my opponent played 14.Re3 when after 14...d4 15.Rh3 b5 Black seems equal.  However my opponent went astray with 15. Re1? when 15...b5 is still indicated but has led to a sizable advantage for Black:



And Black has the pleasant choice between 21...Qg5 and 21...Qh4

My other game just ended as drawn.  My opponent proceeded with 14. Bc2 as in one of the games above but I think I improved over 14...Bxa3 with 14...Bc5, though I was also considering 14...Qd7



And Black gets his pawn back after 25...Rxf8  26. g3 Nxf2.  Is this the last word or can White improve?
  
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