Re: Progressive chess problem

"But there is, with 8. Ke7 Rb8 Rxb2 d4 d3 d2 Ng4 Nxf2#. Try placing the
white knights on d2, e2 instead of a3, f3. There are then several mates
in 9, eg Kf7 Rc8 f4 f3 fxg2 g1N Nf3 Ng4 Nxf2# or Ng4 Nxe5 Nd3 g5 g4 g3
gxf2 f1N Ne3#, but I can't see one in 8, and the Nd2 prevents the BR
from roaming the second rank."

1. d4
2. c5 cxd4
3. e4 e5 Bd2
4. e6 d3 dxc2 cxd1Q+
5. Kxd1 Ba5 Bxd8 Be7 Bxf8
6. Kxf8 f5 Nh6 Nc6 d5 Bd7
7. Ba6 Bxb7 Bxa8 Bxc6 Bxd7 Nd2 Ne2

You're not going to believe this, but:

8. Ng4 Nh2 Nf1 f4 f3 fxg2 gxh1Q Ne3#

Instead, 7. Ba6 Bxb7 Bxa8 Bxc6 Bxd7 Nd2 Nf3.

That prevents both the black f pawn's promotion and the ability of the
black rook to control the second rank.

8. Ke7 Kxd7 Rd8 g5 g4 gxf3 fxg2 gxh1Q! seems to be the best black can
do, and I don't see a white mate on 9.

.