BDG 101
The Blackmar-Diemer Gambit is an aggressive opening for White where White sacrifices a centre pawn (e-pawn) to open lines for attack with rapid development of his pieces. For the pawn Black trades off tempi as he breaks one of the principles in the opening which is: not to go pawn hunting if all the dogs arn't let loose out of the pen. In other words, development of pieces is more important then pawns in the opening.
Let's take a look at the start of the BDG, (D1)
After the moves 1.d4 d5 2.e4!? dxe4 3.Nc3 Nf6 4.f3 Black is faced with moving his d-pawn a third time by either capturing f3 (BDG Accepted) or by moving it to e3 (BDG Declined).
If he decides to leave it on e4 and play another move such as 4...e5 he can quickly land in trouble with, (D2)
Now let's take a look at the BDG Accepted Teichmann Variation (D3)
Here is an example of one of my games against an 2100 rated player on ICC (D4)
Read:
Part 2 http://www.chess.com/article/view/bdg-101-part-2
Part 3 http://www.chess.com/article/view/bdg-101-part-3
Part 4 http://www.chess.com/article/view/bdg-101-part-4
