user30314: 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?

user11144: 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...

30314: <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>
 11144: <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>
