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Hot Topic (More than 10 Replies) Alekhine: Sergeev variation (Read 3668 times)
Kam
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Re: Alekhine: Sergeev variation
Reply #16 - 02/25/17 at 10:43:23
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Black has serious problems in this continuation and I don’t think they can be solved.
The lines involving 8.Rc1 O-O 9.b3 Na6 (ie. not 9…. dxe5) 10.Nf3 c5 or 10.Be2 c5 are currently being analysed and they are related to the the Reply #9 Games of Brabo-MC14999  2014 and Brabo-Dugailliez G 2014.
Isn't chess analysis fun?!
  
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TonyRo
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Re: Alekhine: Sergeev variation
Reply #15 - 02/20/17 at 01:03:16
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Thoughts on 16.Qd2 instead? Seems to me like White gets a better version of your analysis, as now Bxf8 Bf4! resources are not possible, and 16.Qd2 Re8 17.Ng5! looks terrible for Black.
  
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Kam
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Re: Alekhine: Sergeev variation
Reply #14 - 02/19/17 at 05:14:19
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Alekhine’s Defence, Four Pawns Attack, 5….g6 System with 8.Rc1, Refutation and Exchange Sacrifice Discovery.

My previous post has a major flaw, which must be rectified.
1.e4 Nf6  2.e5 Nd5  3.c4 Nb6  4.d4 d6  5.f5 g6  6.Nc3 Bg7  7.Be3 Be6 8.Rc1 O-O  9.b3 dxe5  10.fxe5 c5  11.d5 Bf5  12.Be2 Bxe5  13.Nf3 Bd6

TonyRo (Post #12) has mentioned that the forceful 14.Bh6, must be countered.
TonyRo (Post #12) has also proposed after that after 14.O-O N8d7  15.Bh6 Re8?  (Nf6!?)  16.g4 should be explored. Unfortunately the advance of the g-pawn leads to a devastating refutation with 16…. Bxg4  17.Ng5 Bf5  18.Rxf5! gxf5 19.Qf1 e6  20.Qg2 +-

Playable continuations against the two problems have been found and they are also found to be in some degree inter-transposable.

My current analysis shows that against the rook capture threat by the bishop  14.Bh6, black should counter with an exchange sacrifice offer (R v B+p) with 14….N8d7 !?

The key continuations are as follows:
a) White immediately accepts the exchange sacrifice offer:
15.Bxf8 Bf4!?  16.Bxe7 Qxe7  17.O-O Nf6  18.Nh4 Qe3+  19.Kh1 Be4
20.Nxe4 Nxe4  21.Rc2 Nf2+  22.Rxf2 Qxf2  23.Nf3 Nd7  24.Bd3 Qe3
25.Re2 Qc1  26.Qxc1 Bxc1  27.Re7 Rd8  28.Re1 Bh6=

b) White continues with an intermezzo kingside castle:
15.O-O Nf6!?  (15…. Re8? Would be a move transposition to a position, which was a key theme of my previous post). 16.Bxf8 Qxf8  17.Bd3 Bg4 
b1)18.h3 Qh6!?  19.Re1 Bxf3 20.Qxf3 Be5!?  21.Ne4 Nh5  22.Rcd1 Bd4+  23.Kh1 Nd7  24.Qg4 Ne5 25.Qg5 Qxg5  26.Nxg5 Bc3  27.Re3 Bd4  28. Ree1 =
b2) 18.Qe2 Nbd7  19.h3 Qh6  20.hxg4 Nxg4  21.g3 Bxg3  22.Rb1 Bf4  23.d6 Nde5 =

c) White continues with the intermezzo knight move:
15.Nh4 e6 16.Nxf5 exf5  17.Bxf8 Qh4+  18.Kd2 Bf4+ 19.Kc2 Bxc1 20.Bxc5 Nxc5=

A 14th move deviation  14.O-O N8d7  was mentioned in my previous post. After 15.Bh6, black should continue with 15… Nf6!?  (15…. Re8?  16.g4!? (TonyRo) 16…. Bxg4  17.Ng5 Bf5 18.Rxf5 gxf5  19.Qf1 e6  20.Qg2+-.) 16.Bxf8 Qxf8  17.Bd3 Bg4 and this continuation has transposed to variation b) of the previously mention 14.Bh6 N8d7 variation.

Another 14th move deviation is 14.Nh4 e6  15.Nxf5 exf5  16.Qd2 Re8 17.Bg5 f6 =/Ŧ

     A summary and examples of possible continuations are shown in the pgn file presentation.


  
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TonyRo
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Re: Alekhine: Sergeev variation
Reply #13 - 02/15/17 at 02:11:06
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FWIW, I thought that Black basically had to suffer after the surprisingly forcing 11...Bc8 12.Be2 N6d7 13.Nf3 Nxe5 14.Nxe5 Bxe5 15.Bxc5 Qc7 16.Bd4! Bxh2 17.Qd2! Bf4 18.Be3 Bg3+ 19.Kf1 Nd7 20.Ne4 Be5 21.c5! Nf6 22.Nxf6 Bxf6 and now both 23.Bf4, 23.Bd4, and even 23.Bf3 are all non-trivial to deal with.
  
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TonyRo
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Re: Alekhine: Sergeev variation
Reply #12 - 02/15/17 at 01:59:59
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16.g4+- no? It's also worth noting that perhaps 14.Bh6 is more forcing.
  
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Kam
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Re: Alekhine: Sergeev variation
Reply #11 - 02/15/17 at 00:46:08
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Keano
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Re: Alekhine: Sergeev variation
Reply #10 - 04/08/16 at 19:48:12
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5/5 is pretty impressive Brabo, and objectively Black may be running too many risks. Nevertheless the line is interesting, although I may have to look elsewhere for my 4PA line  Sad
  
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Re: Alekhine: Sergeev variation
Reply #9 - 04/08/16 at 14:23:42
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Keano wrote on 04/04/16 at 18:32:47:
@Brabo - your analysis of 8.Rc1 does look very convincing

Here is an attempt to improve for Black with 9...Na6!?







And Black can try to argue that White has over-extended. My engine is suggesting White simply give up a pawn here for comp. Not sure how many OTB players would go for that.




On my Dutch blog I already wrote in 2012 that white must be always ready to sacrifice the pawn. 2 examples below from my own practice in which I did exactly that.
The first one is from an online blitzgame.

Today my score is 5/5 with 8.Rc1 online.
In OTB I only got 1 opportunity to play 8.Rc1. Also in that game I didn't hesitate to sacrifice the pawn.


So I already was familiar with Na6. In fact my analysis of 2012 only mentions 10.Nf3 but 10.Be2 is perfectly fine too.
I also want to add that besides the pawnsacrifice with 11.d5, there is also 11.dxc5 in your line.

Conclusion the Sergeev-variation is an excellent surprise weapon but it is extremely risky against a well prepared opponent.
  
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Keano
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Re: Alekhine: Sergeev variation
Reply #8 - 04/04/16 at 20:30:08
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MartinC wrote on 04/04/16 at 19:55:03:
Drawing the sample from 4PA players, I'd have thought quite a few Smiley


haha - maybe right.
  
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Re: Alekhine: Sergeev variation
Reply #7 - 04/04/16 at 19:55:03
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Drawing the sample from 4PA players, I'd have thought quite a few Smiley
  
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Keano
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Re: Alekhine: Sergeev variation
Reply #6 - 04/04/16 at 18:32:47
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@Brabo - your analysis of 8.Rc1 does look very convincing

Here is an attempt to improve for Black with 9...Na6!?







And Black can try to argue that White has over-extended. My engine is suggesting White simply give up a pawn here for comp. Not sure how many OTB players would go for that.



  
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brabo
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Re: Alekhine: Sergeev variation
Reply #5 - 10/05/15 at 22:27:28
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A short summary of the rational can be read below. More can be found on my blogs (Dutch and English).

  
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Re: Alekhine: Sergeev variation
Reply #4 - 10/05/15 at 20:05:13
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Brabo:
No, sorry I missed it. I simply mentioned this game, since i saw it to day and was "atracted" to it due to some potential wild play.
I am not well acquainted with this variation, but reading the latest books, one sees that the authors claim that this is critical. So, i was simply "reporting".
In fact after 8.d5 there is the strange move 8...Bf5 played in Mozer-Fier (instead of 8...Bc8) which was analysed recently here by Tom Rendle

What is the rational behind 8.Rc1? My "knowledge of german language" is close to -100.
  
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Re: Alekhine: Sergeev variation
Reply #3 - 10/05/15 at 19:41:06
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lg wrote on 10/05/15 at 18:58:05:
Critical is 8.d5 after 7...Be6


Did you investigate 8.Rc1 which I recommended earlier already here see http://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1267504014/30

A glimpse of my detailed analysis can be found in the article
http://chess-brabo.blogspot.be/2014/06/archiving.html

I mention in the article http://chess-brabo.blogspot.be/2015/04/password.html that I used the move 8.Rc1 with success last year.
  
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lg
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Re: Alekhine: Sergeev variation
Reply #2 - 10/05/15 at 19:28:40
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Tony

great! thanks, luis
  
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