Small book based on Blackmar-Diemer gambit
Not new but quite strong and fun ( 8 out of 10 rateing maybe ), very good for engine tests and for learning
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Blackmar-Diemer Gambit
[You must be registered and logged in to see this link.] This article uses algebraic notation to describe chess moves.
The Blackmar-Diemer Gambit or BDG is a chess opening characterized by the moves
1. d4 d5
2. e4 dxe4
3. Nc3,
to be followed by f3 on White's fourth move.
This gambit is considered an aggressive opening, though its soundness continues to be the subject of much debate both on and off the chessboard. It arose as a development of the earlier Blackmar Gambit, named after Armand Blackmar, a relatively little-known New Orleans player of the late 19th century who popularized its characteristic moves (1. d4 d5 2. e4 dxe4 3. f3) and was the first player to publish analysis on the opening in the chess literature.[1]
The popularity of the original Blackmar Gambit, however, was short-lived, as it was basically unsound, allowing Black to equalize the position after White's immediate 3. f3 with 3... e5!; the best White reply being Be3. The evolved, modern form of gambit owes much to the German master Emil Josef Diemer (1908-1990), who popularized the interpolating move 3. Nc3, delaying the thematic f-pawn offer until the next move. The position resulting after 3. ... Nf6 4.f3 reflects the main line of the gambit accepted, although other Black responses on move three are possible. After many years of analysis, Diemer wrote a book on the opening in the late 1950s, titled Vom Ersten Zug An Auf Matt! (Toward Mate From The First Move!), with most of the published analysis devoted to the Halosar Trap (or Ryder Gambit), a double pawn sacrifice characterized by the moves 4...exf3 5. Qxf3.
It is easy for Black to decline the gambit on the second move with 2...e6 (leading to a French Defence) or 2...c6 (leading to a Caro-Kann Defence), although doing so does not eliminate White's ability to offer alternative gambits such as the Alapin-Diemer Gambit or the Diemer-Duhm Gambit.
As with most gambits, White aims to achieve rapid development and active posting of his pieces in order to rapidly build up an attack at the cost of the gambit pawn. It is one of the very few gambits available to White after 1.d4.[2] Following the normal 4.f3 exf3 5.Nxf3, Black's main defences are:
* 5...Bg4 (Teichman Defence), normally met by 6.h3 Bh5 7.g4 Bg6 or 6...Bxf3 7.Qxf3 c6.
* 5...g6 (Bogoljubov Defence), most usually met by 6.Bc4 Bg7 7.0-0 0-0 8.Qe1 and 9.Qh4, although Bogoljubov himself preferred 6.Bg5 Bg7 7.Qd2 followed by 0-0-0 in a game against Diemer.
* 5...e6 (Euwe Defence), usually met by 6.Bg5 Be7 7.Bd3 or 7.Qd2. The Zilbermints Gambit arises after 7.Bd3 Nc6 8.0-0 Nxd4 9.Kh1, sacrificing a second pawn in order to increase White's initiative, but its soundness is doubtful.
* 5...c6 (Ziegler Defence), when play usually continues 6.Bd3 Bg4 or 6.Bc4 Bf5.
* 5...Bf5 is also an important option for Black.
In addition Black can deviate at move 4 with 4...c6 (the O'Kelly Variation)[3], hoping to get an improved version of the standard Blackmar-Diemer after inaccurate continuations such as 5.Be3, 5.Bf4 or 5.Bg5. White can regain the pawn with equality with 5.Nxe4, but generally prefers 5.Bc4 which usually transposes to the Ziegler Defence after 5...exf3 6.Nxf3 Bf5.
White can also try 5.Qxf3, the Ryder Gambit, but after 5...Qxd4 6.Be3 Qg4 (6...Qb4?! 7.0-0-0 Bg4? 8.Nb5! is the Halosar Trap) 7.Qf2 e5 White has insufficient compensation for the material.
Dismissed by many masters, on the one hand, and embraced enthusiastically by many amateurs, on the other, it is most likely the case that, with accurate play, Black can defend his position and consolidate his extra pawn to good chances in the endgame. As a result, this opening is rarely seen in top-level play, but enjoys a certain popularity among club players.
Nevertheless, Chessgames.com lists the Blackmar-Diemer as the most successful opening for White after 1. d4 d5.[4]
Below is a sample game that features the unusual feat of Grandmaster Efim Bogoljubov beating Diemer with his own favorite opening:
Bogoljubov versus Diemer, Baden-Baden 1952:[5]
1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bg5 Bg7 7. Qd2 O-O 8. Bc4 Nc6 9. O-O-O a6 10. d5 Na5 11. Be2 b5 12. a3 Bg4 13. Ne5 Bxe2 14. Qxe2 Qd6 15. Rhe1 b4 16. axb4 Qxb4 17. Nd3 Qb6 18. Qxe7 Rab8 19. Na4 Qb5 20. Nc3 Qb6 21. Na4 Qd4 22. Ndc5 Nxd5 23. Rxd4 Nxe7 24. Rd7 Nf5 25. Nxa6 Rbe8 26. Rxe8 Rxe8 27. Nxc7 Re1+ 28. Rd1 Rxd1+ 29. Kxd1 Nc4 30. Nd5 Nxb2+ 31. Nxb2 Bxb2 32. Ke2 Be5 33. h3 h6 34. Ne7+ Kf8 35. Nxf5 hxg5 36. Ne3 Ke7 37. Kd3 f5 1-0
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Chess Opening Theory
(To be fair, the final position here is a draw, so Diemer likely lost "on the clock" (by his time running out)
