Originally Posted by Abba
While you could use f4 with white and make the claim that it'll lead to a Dutch setup, there are a few differences:
1) The Dutch is in response to 1 d4. With this move not played yet, black will have the oppurtunity to play d6 instead. This in itself allows this gambit to be effective: 1 f4 e5 2 fxe5 d6.
2) Black could also do a slower buildup with d6 and play for ...e5. It's certainly a different game altogether as white will find it much more difficult to keep control of e5.
3) Of course, black may just response with 1...d5 and then yes, it'll lead to Dutch positions with an extra white tempo.
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Tidbit: 1. f4 d5 is the Dutch variation of the Bird. Yes, the Bird allows From's gambit which is quite good.
There are many reversed openings, a fair number are possible for both sides because they are 'non-confrontational' as I call it. The King's Indian Defense and Attack for example, the Modern Defense/Benko Opening etc.
Some rely on the opponent to agree to it. Like the Reversed Sicilian, Grünfeld Reversed etc... meh..
All of that is pretty obvious and boring, what's more interesting is that the extra tempo can be a bad thing!