Answers.Body: <p>Computer variants (Lichess/Stockfish) are no answer ;-), but since it would get way too long for a comment...</p>
  <p>1.d4 c6 (Playable, +0.3 vs e.g. +0.2 for d5, but very tame.) 2.Bf4 (Also uncommon, back to +0.1 vs. a normal developing move.) 2...Qb6 (Back to +0.3, again a normal move like Nf6 is preferrable) 3.Nf3 (+0.3, b3 is only +0.1) 3...Qxb2 (Asking for it, +0.9.) After the following, say, 4.Nbd2 d5 5.e4 White has a scary development advantage which, as the computer assessment shows, compensates for the pawn big time. On the other hand, White must play energically to justify it, since +0.9 also means Black is not immediately busted and might defend to &quot;teeth's skin&quot; and bring home the bacon resp. pawn in the endgame, as <em>my</em> typical games go...</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-11-19T09:28:21.077Z
Answers.LastActivityDate: 2021-11-19T09:28:21.077Z
Answers.UserDisplayName: Hauke Reddmann
Body: <p><a href="https://chess.stackexchange.com/questions/27829/what-does-black-achieve-with-1-d4-c6">What does black achieve with 1.d4 c6?</a></p>
  <p>Contributor mentions 1. d4 c6 2. Bf4 Qb6.  Database shows few such openings, all responding 3.b3 with <em>white winning no matches</em>.  Should white offer Qxb2 poison?  Can white follow with Vaganian Gambit given Nb5 is no threat.  Without Nb5, can white still trap the Q?</p>
  
Tags: <caro-kann><1.d4><london-system><poisoned-pawn>
Title: Poison Qb2 and prerequisites for Vaganian
ThreadText: # Poison Qb2 and prerequisites for Vaganian
  
  (Asked by: username_0 on 2021-11-17)
  
  [What does black achieve with 1.d4 c6?](https://chess.stackexchange.com/questions/27829/what-does-black-achieve-with-1-d4-c6)
  
  Contributor mentions 1. d4 c6 2. Bf4 Qb6. Database shows few such openings, all responding 3.b3 with *white winning no matches*. Should white offer Qxb2 poison? Can white follow with Vaganian Gambit given Nb5 is no threat. Without Nb5, can white still trap the Q?
  
  **Tags:** caro-kann, 1.d4, london-system, poisoned-pawn
  
  
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  ## 1 answers
  
  ### Answer by username_1 on 2021-11-19. Score: 2
  
  Computer variants (Lichess/Stockfish) are no answer ;-), but since it would get way too long for a comment...
  
  1.d4 c6 (Playable, +0.3 vs e.g. +0.2 for d5, but very tame.) 2.Bf4 (Also uncommon, back to +0.1 vs. a normal developing move.) 2...Qb6 (Back to +0.3, again a normal move like Nf6 is preferrable) 3.Nf3 (+0.3, b3 is only +0.1) 3...Qxb2 (Asking for it, +0.9.) After the following, say, 4.Nbd2 d5 5.e4 White has a scary development advantage which, as the computer assessment shows, compensates for the pawn big time. On the other hand, White must play energically to justify it, since +0.9 also means Black is not immediately busted and might defend to "teeth's skin" and bring home the bacon resp. pawn in the endgame, as *my* typical games go...
  
  
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