Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack is a chess opening with the ECO code D00, part of the Blackmar-Diemer Gambit Accepted family. It goes 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. O-O O-O 8. Kh1. White opens with 1. d4 (the queen's pawn) and Black answers 1... d5. After 15 moves it is Black to move. After the last move Black is a pawn ahead in material. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. d4 – White plays the pawn to d4
1... d5 – Black plays the pawn to d5
2. e4 – White plays the pawn to e4
2... dxe4 – Black captures on e4 with the d-pawn
3. Nc3 – White plays the knight to c3
3... Nf6 – Black plays the knight to f6
4. f3 – White plays the pawn to f3
4... exf3 – Black captures on f3 with the e-pawn
5. Nxf3 – White takes on f3 with the knight
5... g6 – Black plays the pawn to g6
6. Bc4 – White plays the bishop to c4
6... Bg7 – Black plays the bishop to g7
The line goes on for 3 more moves; the lesson shows them all.
About the Blackmar-Diemer Gambit Accepted
White gives a pawn with 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3, and Black takes with ...exf3. White gets fast development and an open f-file for attack.
White recaptures with Nxf3 and plays Bd3, O-O and Qe1-h4 to attack.
The rook on f1 hits f7 down the open f-file.
Black is a pawn up; calm development with ...e6 or ...g6 usually holds.
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