Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation 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 Bf5 6. Ne5 e6 7. g4 Be4. White opens with 1. d4 (the queen's pawn) and Black answers 1... d5. After 14 moves it is White 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... Bf5 – Black plays the bishop to f5
6. Ne5 – White plays the knight to e5
6... e6 – Black plays the pawn to e6
The line goes on for 2 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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