My stats indicate I get the Teichmann Exchange most often. I dont know why, because the white attack is simple and fast. But the defender thinks that, by exchanging the knight on f3, he is one piece closer to a winning end game. Things are not so simple however as white has nice attacking chances.
However, there is one line that always bothered me :
1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.g4 Qxd4
Blacks grab another pawn : "a pawn is a pawn"
moving away from the file where it comes under attack of the rook
10...e6 is now the best defending move, even if 10...Nbd7 has to be respected.
10...e6 11.g5 Nd5 12.Bd4 (diagram)
White has moved his blacksquared bishop to a great diagonal. Thinsg are getting complicated for black !
Let's see what black is up to. 13.Kb1 is also possible, but that is not the kind of move a gambiteer likes to play.
Let's assess this position
a/ 13...Be7 14.Bxg7 Rg8 15.Nxd5 cxd5 16.Bc3 Qa4 17.Bd3 and white has an obvious advantage (+)
b/ 13...Rg8 14.Bh3 (+)
c/ 13...f6 14.Bh3 (+)
d/ 13...f5 14.gxf5 Nxf6 15.Bh3 (+)
e/ 13...0-0-0 14.Qxf7 Qe7 15.Qf3 (+=)
f/ 13...Bd6 14.a3
...f1/ 14...Bf4+ 15.Kb1 Qa5 16.Nxd5 Qxd5 17.Qxf4 Qxh1 18.Be2 (++)
...f2/ 14...Qa5+ 15.Bxg7 Rg8 16.Nxd5
......f2a/ 16...cxd5 17.Bc3 (+=)
......f2b/ 16...Rxg7 17.b4 Qd8 18.Nf4 (+=)
g/ 13...Qd6 14.Kb1
...g1/ 14...Qf4 15.Qe2 (+=)
...g2/ 14...0-0-0 15.Bg2 (=)
...g3/ 14...c5 15.Nxd5 (=)
...g4/ 14...e5 15.Ne4 (+=)
So the unimaginable has become reality - there are a few lines that give black equality in the Teichmann Exchange !!