I admit - my recommendation on a line in the Teichmann Exhange was wrong. I had published the continuation 10.Nb5 in my book "Attack with the Blackmar Diemer" on the line 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.g4 Qxd4 9.Be3 Qd6.
Let's take the natural 10.g5 as a starter - if it weren't for the potential g5, why play g4 anyway ?
a/ 10...Nd5 11.000 e6 12.Bb5 !!
( The Killer move - it is very probable that the gambiteer will get his opponent thinking on that move ! It certainly puts pressure on the knight on d5 and the queen on d6, but is it correct ? )
....a11/ 13...exd5 14.Bf4 Qc5 15.Rhe1+ Be7 16.Qe2 (=) and the initiative outweigh the pawns
....a12/ 13...cxd5 14.Rf1 +=
..a2/ 12...cxb5 13.Rf1 Qd7 14.Nxd5 exd5 15.Rxd5 Qe6 16.Rd4 Be7 17.Re4 Qxa2 18.Rxe7+ Kxe7 19.Qxb7+ Nd7 20.Bc5 Kd8 21.Re1 Qa1+ 22.Kd2 (=) resulting in a very unbalanced position
..a3/ 12...Be7 13.Nxd5 exd5 14.Rxd5 (=)
b/ 10...Nfd7 11.Bf4
..b1/ 11...Qe6+ 12.Be2 (=)
..b2/ 11...e5 12.Bd2 (=)
..b3/ 11...Qd4 12.Rh2 !! (=)
..b4/ 11...Ne5 12.Qg3 (=)
..b5/ 11...Qg6 12.000 (+=)
..b6/ 11...Qb4 12.000 (+=)
..b7/ 11...Qc5 12.000 (+=)
In addition, you might want to consider the simpler 10.Rd1, which might even be better than the crazy continuation described above.
I admit, my killer move does not win instantly - but hey, if you want to play it safe, play something quiter than the Blackmar Diemer !