The Blackmar Diemer defender has no time to loose in the opening. But sometimes, they do think they have all the time for fancy things - that's waht happened to my opponent today in a chess.com blitz game
1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c6 6.Bc4
The Ziegler, which can turn into the O'Kelly defense when combined with a subsequent Bf5.
Black wants to get rid of that annoying c3 knight, but is there time ?
7.Ne5 !! e6 8.0-0 (diagram)
Dark clouds appear on the horizon - black is forced to retreat his jumper.
8...Nf6 9.Ne4 (diagram)
Being so much behing in development, taking the knight is no option for black, eg 9...Nxe4 10.Nxf7 Qc7 12.Nxh8 (++)
9...Be7 10.Ng5 (diagram)
Black has to defend f7 and can do so in two ways.
a/ 10...0-0 11.Qd3 h6 12.Nexf6 Rxf7 13.Nxe6 Bxe6 14.Bxe6 Qf8 15.Qg6 (+)
b/ 10...Rf8 11.Be3 (+=)
I was actually quite proud of that finding this in a blitz game.
A fair punishment for black loosing so much time in the opening !