The Blackmar Diemer forces the opponent to make mistakes.

I said it before, the Blackmar Diemer gambit forces your opponent to make mistakes. Playing our beloved gambit against a perfect opponent is difficult, but humans tend to react strangely when faced with the fierce attacking lines. And then they make mistakes. Why ? I dont know - I am not into chess psychology...

That's what happenened yesterday to me into my game in the Belgian league. I had to win as our team was avoiding to be transfered to a lower league. Luckily my young ( and promising ) opponent was not immune to chess psychology.

Guido De Bouver - Sander Devriendt
1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5
The Gunderam defense.

6.Ne5 Nbd7
Black challenges the knight on e5 immediately.

7.Qf3 e6 8.Qxb7 Bd6 ( diagram )
Ah, chess psychology at work. Black realizes he should develop quickly, but doesnt see the hole at c6. 8...Rb8 or 8...Nxe5 ( see my earlier blog ) are correct.

9.Nc6 Qc8 10.Qxc8
Ah, now I make a mistake also. 10.Ba6 would win, but luckily black is so impressed with my play that he makes a second, decisive mistake.

10...Rxc8 11.Ba6

Now 11...Nb8 would have equalised, but the continuation 11...Nb8 12.Bxc8 Nxc6 13.00 Nxd4 14.Bf4 is hard to see across the board.

11...Ra8 12.Bb7 00 13.Bxa8 Rxa8 14.00 Bxc2 15.Bf4

And I went on to win in 45 moves.

Question. In what opening is the game decided in the first 10 moves ?
Answer. The one and only Blackmar Diemer.