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Jesse Mattson vs Stanley Robertson
Philadelphia International (1993), Philadelphia, PA USA, rd 5, Jun-27
Blackmar-Diemer Gambit: Netherlands Variation (D00)  ·  1-0

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

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Kibitzer's Corner
Apr-09-03  Rookpawn: Usually, one reaches the Blackmar-Deimer Gambit with the moves: 1. d4 d5 2. e4 dxe4 etc. However, this game arrives at the gambit after transposing from the Scandinavian Defense. Of course, Black need not accept the gambit: he can decline by transposing into the Caro- Kann (after 2... c6) or the French (after 2... e6).
Apr-09-03  Bears092: Gr... as a former Blackmar/Blackmar-Diemer Gambit player I have to correct you.

1. d4 d5 2. e4 is the Blackmar Gambit

1. d4 d5 2. Nc3 Nf6 3. e4 is the Blackmar-Diemer Gambit

Feb-17-04  Cerebrate2006: er...this is a little less than a year late, but bdg is 1.d4 d5 2. e4 dxe4 3. nc3 nf6 4. f3 while blackmar is 3. f3 before the knights are out
Dec-20-05  DeepBlade: http://www.geocities.com/Athens/Acr... an nice site about the gambit.

Quoting the site, to correct you both!

Variations
We don't like to play chess by memorizing long variations, but if you're going to play an opening it helps to have a feel for its key variations. In our experience we've found it useful to organize our study of variations into four major categories.

Accepted
The straightforward, plain vanilla BDG main line is 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3. I've seen all sorts of other things called a BDG by others who ought to know better. Years ago, for example, the ICCF ran BDG thematics with the only required moves being 1.d4 d5 2.e4, somewhat akin to calling 1.e4 c5 2.d4 the Smith-Morra Gambit. To have a BDG you have to have Nc3 and f3 in there. And of course if the gambit is accepted you have to have exf3.

Declined
After 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Black can decline the gambit with various other 4th moves. We've seen games labeled the BDG declined when White never played f3. Now, seriously, you've got to have an offer before you can decline it.

Avoided
Here we're talking about deviations by either player before 4.f3. Well, then, we're not talking about a BDG, right? Right. However, there are certain lines that are essential knowledge for anyone attempting a BDG--the Lemberger Countergambit, for example, where Black plays e5 on his third move and heads White off before he can offer the f-pawn.

Transpositions
There are many different pathways to the BDG. It's reassuring to know that you have ways to get to one even when Black doesn't answer 1.d4 with d5, or even when (heavens forbid) you open with 1.e4.

Nov-01-06  GeauxCool: Who annotated?
Nov-16-06  popski: I like this game! I know what i will play against 1.e4 d5 now :)
Aug-25-13  RookFile: It's a good game by white.

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