1.d4
threat 2.e4
1...d5
Queen Pawn Game
2.Bg5
A very unusual move, aiming to develop the dark-squared bishop without blocking it in with e3
2...Bf5
With the same idea
3.Nf3
Nf6
4.c4
e6
Black is fine
5.e3
Diagram
5...h6
But this is an error. dxc4 or simply Be7 are far better
6.Bxf6
Qxf6
7.Qb3
Attacking the undefended b-pawn and adding a second attack on d5
7...Nc6
Under-estimating the danger
8.Qxb7
Kd7
Perhaps expecting Qxa8?? Bb4+ winning the queen
9.cxd5
exd5
10.Bb5!
There's no way to prevent Ne5+ winning the Nc6. Even 11.Qxc6 Qxc6 12.Ne5+ is playable. 1-0