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Normal Topic Accelerated Bogo 3..a5 4.a3 (Read 439 times)
MartinC
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Re: Accelerated Bogo 3..a5 4.a3
Reply #5 - 01/12/26 at 08:48:19
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Oh yes, you really don't want the knight on d7 there.

The fun stuff is - via the Bogo move order - 4 Bd2 a5 5 a3 Bxd2+ 6 QxB o-o 7 Nc3 d6!? (?!) 8 e4 e5 9 o-o-o Qe7 (Qe8!?)

Then probably 10 h3 to stop Bg4 ideas either white takes on e5 (Nxe5) or black on d4. White gets a slow pawn storm, black can jump about a bit with his knights and dream of KID bishops on g7! Alas Smiley

It all looked more or less survivable.

10 h3 Nc6 11 de Nxe5 12 Qe3 Rd8 13 Nd2!? c6 14 g4 etc, but loads of similar options.
  
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Nernstian59
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Re: Accelerated Bogo 3..a5 4.a3
Reply #4 - 01/10/26 at 23:44:12
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MartinC wrote on 01/08/26 at 08:52:05:
if black goes in for 5.. d6 6 Nc3 Nc6!? then white doesn't have anything better then Nf3 at some point when it'll be a main line bogo indian line.

MartinC - In her notes to the Killer Bogo Indian, IM Paehtz gives 5...d6!? as an alternative to 5...Nf6 in the OP's line, although she doesn't comment or analyze further. However, she tried 5...d6 herself against Nurgyul Salimova (London Tech GCL rapid, 2024). After 6.Nc3, Paehtz played 6...Nc6 just as in your line from Reply #3. As predicted in that post, the game soon became a regular Bogo-Indian after 7.Nf3 Nf6 8.g3 0-0 9.Bg2 e5.

Stockfish's partiality to castling long in these positions is something that I also noticed. In fact, Paehtz warns that after 5...Nf6 6.Nc3 the seemingly normal 6...d6 runs into trouble after 7.e4 Nbd7 8.0-0-0!N. Now the intended 8...e5 is met by 9.Nf3, and Black is in difficulties due to the masked pressure down the d-file. The most obvious problem is that 9...0-0 is answered with 10.dxe5 dxe5 11.Nxe5, winning a pawn. The engine clearly favors White after 9.Nf3, giving ±.
« Last Edit: 01/11/26 at 19:49:02 by Nernstian59 »  
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MartinC
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Re: Accelerated Bogo 3..a5 4.a3
Reply #3 - 01/08/26 at 08:52:05
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Checking my notes, if black goes in for 5.. d6 6 Nc3 Nc6!? then white doesn't have anything better then Nf3 at some point when it'll be a main line bogo indian line. 

Not that it isn't quite a good one for white! Interesting and complex positions if white goes o-o-o (as SF firmly desires) mind you.

You can even just about play with 5.. b6 with Ne7, allowing e4 but going d5 in response. Not amazing.

The comps have a definite preference for 5/6.. d5. A couple of vague plans from an instant prod: Qe7, Nbd7 looks normal. Nf3, e3 etc from white

Then if (when?!) white takes on d5, either b6,Bb7 to play with c5 and hanging pawns or Nb6/Be6/g6/c6 and seemingly sit about patiently. It's maybe a little bit depressing and thoroughly standard sorts of plans.
  
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Nernstian59
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Re: Accelerated Bogo 3..a5 4.a3
Reply #2 - 01/08/26 at 02:41:16
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The position after 6...d5 is covered in the Killer Bogo Indian video course by IM Elizabeth Paehtz, available from gingergm.com

https://gingergm.com/library/killer_bogo_indian

She also explains why 6...d6 with the usual dark-squared strategy can lead to problems for Black. In addition, the course comes with PGN files for the lines she presents in the videos.

The position after 6...d5 is also covered in the Chessable course The Dynamic Kangaroo – A Bouncy Guide to an Offbeat System by FM Tobias Vöge.
  
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an ordinary chessplayer
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Re: Accelerated Bogo 3..a5 4.a3
Reply #1 - 01/07/26 at 20:33:14
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It looks a little bit like a Ragozin, but white lacks the bishop pair. If you can't find any theory, you can make your own. 
  • Set up the position after 1.d4 e6 2.c4 Bb4+ 3.Bd2 Qe7 4.a3 Bxd2+ 5.Qxd2 Nf6 6.Nc3 d5 
  • Start your engine.
  • You quickly play some natural moves for white, and play the engine moves for black.
  • When the engine is winning, you take back the moves and try some other natural moves for white.
  • Pretty soon you know what to do as black against anything your typical human opponent might try as white.

I got this idea from the Perpetual Chess Podcast, credited to GM Eugene Perelshteyn.
https://youtu.be/8F6mtFA0Wok
  
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Accelerated Bogo 3..a5 4.a3
01/07/26 at 16:48:58
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Hello,

I try to understand the following position from the accelerated Bogo-Indian: 1.d4 e6 2.c4 Bb4+ 3.Bd2 a5 4.a3 Bxd2+ 5. Qxd2 Nf6 6.Nc3 d5

In the past, I used to play a dark squared strategy with the idea of playing...d6, ...e5. This worked fine. But now I am wondering how to play the position after 6...d5. I would like to understand the ideas/plans for black and how to develop the pieces. I could not find any good treatment explaining the theory.

Are there any resources, where I can read about the plans and how to develop the pieces in best possible way? Or is there no existing theory?

I would appreciate your help. Best wishes.
  
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