Last sunday ( yes, on the first anniversary of my blog ), I participated in a blitz tournament and I was able to put in some Blackmar Diemer's successfully. Unfortunately, the winner, a strong IM, crushed me with a Pirc - I would loved to see his response against my Blackmar Diemer.
One opponent played an obscure line in the Teichmann against me that I had covered in my my book "Attack with the Blackmar Diemer". I suggested the move 11.Be3 as best in a line 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.Qf3 c6 10.g5 Bxc2 (diagram).
Unfortunately, 11.Be3, as suggested in my book, allows black to exchange a piece for three pawns, eg 11...Nbd7 12.Rh2 Bg6 13.gxf6 Nxf6 (+=) (diagram) and the position is far from clear as black has no weaknesses.
During the game, I played the simple 11.gxf6 ( diagram ) and now, during the analysis, I find it to be far stronger than 11.Be3.
a/ 11...gxf6 12.Nc4
...a1/ 12...Bg6 13.h4 (+)
...a2/ 12...Nd7 13.h4 (+)
...a3/ 12...Rg8 13.Bf4 (+)
...a4/ 12...Bb4 13.Rh2 (+)
...a5/ 12...Bd6 13.Nxd6+ Qxd6 14.Qxf6 (++)
...a6/ 12...Be7 13.Bf4 (+)
...a7/ 12...Na6 13.Ne3 Nb4 14.Rh2 (diagram)
......a7b/ 14...Bg6 15.a3 Nd3+ 16.Bxd3 Bxd3 17.d5 (+)
......a7c/ 14...Bd3 15.a3 Bxf1 16.axb4 (+)
......a7d/ 14...Qxd4 15.Rxc2 Nxc2+ 16.Nxc2 (+)
b/ 11...Qxf6 12.Bf4 (+)
c/ 11...Qxd4 12.fxg7 Qxe5+ 13.Kd2 (+)
So it seems I stumbled by ignorance into an improvement ! And guess what, yes I won that game !