Originally posted by c guy1
moving the pawn early on often leads to a win...but to the player of this thread...nice win!
In the opening, black playing f5 is usually a much better move than f6 simply because black's pawn on f5 blocks the white queen on h5 from menacing the pawn on e5. That's why the King's gambit (I know that's with white, but it's the same concept) and the Latvian are risky, but solid moves, whereas the Dianamo (sp?) defense (1.e4 e5 2. Nf3 f6) is plain bad.
When the white queen hits h5 against a pawn on f5, black can play g6 and the queen has nothing productive to do and must retreat. With the pawn on f6, black can clear it out with Nxe5 fxe5 and then the white queen has the e5 pawn as a juicy and destructive target from h5.
For another example of the dangers of playing f6 (in this case it was white playing f3, but because of a silly lost tempo white was, in essence, playing black), see Game 5836462