How many mistakes?

GM John Nunn thought you needed to make 3 mistakes in the opening to lose quickly as White, and 2 mistakes to lose if you were Black. The following game is certainly a quick loss for White, although what the real mistakes were is open to debate.
10.c3 was definitely one, as Blacks next move showed. I'd also point the finger of blame at 9.Na4 although at that point White was already running out of good moves. And while I didn't think exchanging on c6 was correct, following it up with 6.d4 was the first real mistake. After 6...Ba6 White had a problem with getting the king to safety, and the rest of the game was about exploiting this fact.


Radisich,Matt - Press,Harry [B30]
Street Chess, 16.11.2019