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1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4
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Bg4 is alot of fun for white. However, theory always gave black an edge after Bxf3. In this line I revived a gambit that is highly underestimated.

5...Bg4 6.h3 Bxf3 [6...Bh5 7.g4 Bg6 8.Ne5 This is covered in the database] 7.Qxf3 c6 8.g4! Qxd4 [8...e6 9.g5 Nd5 10.Ne4 Be7 11.Bd2+/= (11.c4!? Nb4 12.Rh2 Qa5 13.Kd1) ; 8...h6 9.Bd2 e6 (9...Qxd4 10.0-0-0 Qb6 11.h4+/=) 10.0-0-0 Bb4 11.Bg2=]9.Be3

White's idea of 8.g4! allowed white to avoid protecting his pawn. This way he was free to place the bishop on d2, which is a better square. These gambit lines are as sound as they are fun. This line is a huge improvement over the old 8.Be3. Now things get wild!

 9.Be3 Qd6

9...Qd8 10.g5 Nd5 (10...Nfd7 11.0-0-0 Qa5 12.Nb5 e6 transposes) 11.0-0-0 e6 12.Nxd5 [12.Bb5!?] 12...cxd5 13.Bb5+ Nc6 14.Rhf1 Qc7 15.c4 0-0-0 16.Bxc6 Qxc6 17.Kb1+/=

9...Qb4 10.0-0-0 e6 (10...Nbd7 11.g5 Ne5 12.Qg3 Nfd7 13.Rd4 Qa5 14.Bf4 f6 15.h4) 11.g5 Nd5 (11...Nfd7 12.Nb5 Qa5 13.Bd4=) 12.Nxd5 cxd5 13.c4!=]


13...dxc4?? 14.Bg2 Nc6 15.Qxc6+!! The position after 13.c4 is very tricky for black because white wins a pawn back and his king is safe after Kb1.

10.Rd1!? Qb4 11.g5 Nfd7 [11...Nd5 12.a3->] 12.a3 Qxb2 13.Nb5 Qe5 [13...Na6 14.Bc4 Ne5 15.Qf5 e6 16.Bxe6 Bb4+ (16...Be7 17.Bd7+ Nxd7 (17...Kf8 18.Bd4 Qxb5 19.Bxe5+/=) 18.Qxd7+ Kf8 19.0-0 Qxb5 (19...Qe5 20.Nd6 Qxe3+ 21.Kh1 Nc5 22.Rxf7+ Kg8 23.Qxe7 Qxh3+ 24.Kg1 Qg3+ 25.Kf1 Qh3+ 26.Kf2+-) 20.Qe6 Bf6 21.Rxf6 gxf6 22.Qxf6+-) 17.axb4 Qxb4+ 18.c3 Qxb5 19.Bxf7+ Nxf7 20.Qe6+ Kf8 21.Rd7 Qb1+ 22.Ke2 Qc2+ (22...Qg6 23.Qxg6 hxg6 24.Rf1+/-) 23.Bd2 Qg6 24.Rxf7+ Qxf7 25.Rf1+/-] 14.Be2 Na6 15.0-0~~ This is unclear

1.d4 Nf6 2.f3!?

I am showing you this line because 2.Nc3 d5 3.e4 Nxe4 is the most boring line in the Diemer. 2.f3!? however, is a whole other story. White gets what he wants... an attack. If black wants to decline the gambit then I think there is potential in the c5 systems.

2...d5 [2...c5 3.d5 e6 4.e4 exd5 (4...d6 5.c4 exd5 6.exd5!? g6 (6...Be7 7.Bd3 0-0 8.Ne2=) 7.Qe2++/=) 5.e5!? Ng8 (5...Qe7 6.Qe2+/=)6.Qxd5 Nc6 7.Nc3 d6 8.Bb5 Qd7 9.Bg5 h6 10.Bh4] 3.e4 e6 [3...c5 4.e5 Ng8 (4...Nfd7 5.e6!?) 5.c3 Nc6 6.Be3 Bf5 7.dxc5=] 4.e5 Nfd7 5.Be3!?(Blacks knight is misplaced and he may be a bit worse after f4)