I showed a game between Dreev and Vachier-Lagrave where the players were effectively out of "book" by move five and yet they both (Vachier-Lagrave especially) outperformed Firebird through 18 moves.
To say that "[f]ew of us are good enough to see GM's mistakes, particularly when watching the games at that speed." (Atos) is admitting that the game isn't silly. Or at least, isn't any more silly than what most of us capable of at any speed.
But having said that, I expect some diamond/blue turnip member can come along and ask this thread to be shut down, ending the conversation.
tonydal can do that !
I am not sure that I can discern the difference between 2600 and 2200-2300 play without careful analysis, which I am not willing to put into bullet games. However, as pointed out, these games almost invariably have a couple of bad blunders, which even if the rest of the moves are on 2200-2300 level would put the whole game on about 1800 level. As I said before, I don't think that I could win against an FM on standard time control, but if I knew that the FM was going to hang a piece a couple of times in the game... hm... I think I'd win more likely than not.
Okay, but still the Benoni shouldn't take someone "out of the book", provided that they read it.