The Blackmar-Diemer Gambit is a White gambit opening in the Queen Pawn Openings. White can play “e4” immediately, or can delay it a move or two. The Blackmar-Diemer Gambit is not regarded as particularly sound, and is rarely seen at master level, but it does have its dangers for Black. This opening can be effective for White in beginner and club chess tournaments.
Diagram: Blackmar-Diemer Gambit
The usual plan for White is to play Nc3, f3, and then Nxf3 (after Black plays e4xf3). White gets an active position in return for a gambited pawn, as is the usual case with a gambit line.
Diagram: Blackmar-Diemer Gambit Main Line
Black has various options, all of which are playable lines for Black that don’t really promise an advantage for White:
- 4…Bf5 (BDG undecided, accepting the gambit or not?)
- 4.. exf3 (BDG accepted!)
- 4.. e3!? (BDG declined)
Transpositions to the BDG
The BDG gambit can arise by transposition from a number of different openings:
- Indian Defences (1. d4.Nf6)
- Nc3 Attack
- Center Counter (Scandinavian)
- Alekhine’s Defence
- Trompowski (not really a BDG, but there is a “Trompowski BDG-like Gambit” that may actually be better than the main-line BDG)
Although admittedly the BDG is less sound than most of the other openings from which it may occur! Nevertheless, it can be great for blitz or an opening surprise against an unprepared opponent.
Transposition from Anti-Indian
The BDG can be used as an “Anti-Indian” against Nf6 players. White simply plays 2.Nc3 (instead of 2.c4), which will often cause Black to play "2..d5’. Then White can play e4, or perhaps f3 and then e4.
Diagram: Blackmar-Diemer from Indian Defences
Transposition from Scandinavian (Center Counter)
Transposition from Center Counter: The Blackmar-Diemer Gambit can also arise via transposition from the Center Counter Game (i.e. the Scandinavian). After “1.e4 d5”, White can play “2.d4!?” to arrive at the gambit line (instead of “2.e4xd5”).
Diagram: Blackmar-Diemer from Scandinavian Defence
The moves “e4” and “d4” have been simply reversed in this transposition.
Transposition from Alekhine’s Defence
The BDG can also surprisingly arise as a way to play against Alekhine’s Defence. The move order of “d4” and “e4” is also reversed in this line.
Diagram: Blackmar-Diemer from Alekhine’s Defence
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