Last week, I showed that the line 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6 6.Bg5 c5 7.Bxf6 Qxf6 8.Bb5+ offers no advantage to white as black can get an equal game after both 8...Bd7 and 8...Nd7.
So let's look for some alternatives. 8.d5 shows up immediately (diagram). Possible black moves include : 8...a6, 8...exd6, 8...Nd7, 8...Be7, 8...Bd6 and 8...Bd7
a/ 8...Bd7 9.Bc4 (+=)
b/ 8...Be7 9.Bb5+ (diagram)
......b1a/ 10...a6 11.dxe6 fxe6 12.Ne4 Qh6 13.Bxd7+ Nxd7 14.Nfg5 (=)
......b1b/ 10...00 11.Qe2 (+=)
......b1c/ 10...Bxb5 11.Nxb5 (+)
......b1d/ 10...e5 11.Qe1 (+)
......b1d/ 10...Qh6 11.Qd3 (+=)
...b2/ 9...Nd7 10.d6 Bd8 11.00 (=)
c/ 8...Bd6 9.Bb5+ (+)
d/ 8...Nd7 9.Bc4 (=)
e/ 8...exd6 9.Bb5+ (+=)
f/ 8...a6 9.Qd2 (diagram)
......f1a/ 10...fxe6 11.000 (=)
......f1b/ 10...Qxe6+ 11.Kf2 (+=)
...f2/ 9...Bd7 10.000 (+=)
...f3/ 9...exd5 10.Nxd5 (+=)
...f4/ 9...e5 10.Bd3 (=)
...f5/ 9...Be7 10.Bd3 (=)
...f6/ 9...Bd6 10.dxe6 (=)
So we see that white doesn't have any improvement in 7.Bxf6 Qxf6 8.d5 compared to 8.Bb5+. What now ? Accept that the Blackmar Diemer does not win by force ? But then again, it took a worldchampion to figure out the great countermove 6...c5.
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