What is blackmar diemar gambit?

The Blackmar-Diemer Gambit (BDG) is a chess opening that is characterized by the moves 1.d4 d5 2.e4. This opening was named after two German chess players, Karl Ernst Adolf Blackmar and Emil Joseph Diemer.

The BDG is a gambit, which means that white sacrifices a pawn early in the game in order to gain an advantage in development and to create attacking opportunities against the black king. The opening is known for its aggressive play and tactical complexity, and it is particularly effective in blitz and fast-paced games.

The main idea behind the BDG is to control the center of the board, disrupt black's pawn structure, and open up lines for white's pieces. Black can either accept the gambit pawn with 2...dxe4, or decline it with moves like 2...Nf6 or 2...e6.

There are several variations of the BDG, including the Lemberger Variation, the Euwe Defense, and the Bogoljubow Defense. Each variation has its own unique characteristics and requires a different approach from both sides.

Overall, the BDG is an exciting and unconventional opening that can catch black off guard and lead to dynamic and sharp positions. However, it also requires careful play and accurate calculation from white, as any mistakes or inaccuracies can quickly lead to a disadvantage.