if my opponent play 1. f4 .. what do u recommend i play. thanks.

i like Nf6 to keep him from playing e4

Offer a draw! :P

e6 hoping for 2.g4!

I always play g6. After g6 I always play easy moves like Bg7, Nf6, 0-0, Nc6, e6 and so on.

No one has played 1.f4 against me since 1990

I play 1...d5 and act as if I'm white vs the Dutch...

1.f4......

Why not just wear a sign that says "whip me 'cause I love it!!".  If white is going to play that poorly they shouldn't be allowed out in public.  As I have stated before, real White players have nothing to fear from the From.  Beginners must fear everything however.

black  gave a pawn and went for mate.i feel f4 is played after castling.its a double edged sword.u play too early defence is weakened.use it timely it gets u a win.

Well, you certainly can't expect an easy mate, but From's gambit does give black very active piece play and some real positional plusses if accepted. Here is one of my games:

1 f4 d4 Scores -0.20 The idea is to keep white from playing 2.e4 perhaps leaving them with a similar structure to the sicilian (except from whites perspective). Personally I dont like the Bird openingI think it creates a weakess when Short side Castling. The game above illustrates A great H pawn attack further weakening the king side

1.f4 c5

or

1.f4 g6

d5.

The most popular response for black from my experience with da Bird is 1.d5 and an early kingside fianchetto (Bg7). From's Gambit 1.e5 can be pretty dangerous. One slip and you're toast. If you are well prepared for From's, and if you don't mind defending for a bit holding onto a pawn in an unclear position, then you might be okay.

From is not effective at higher levels except as surprise.  That's not much of a plan

I like  Birds Opening I play both sides of the line if you play 1.d5 your playing the Dutch defense a tempo down and if you play 1.e5 in response to Birds then you have to be ready for the strong possibility of facing the Kings Gambit 2.e4 a rich tactical mind field!

I feel that is the only real truth about f4. If it were otherwise grandmasters would play it more often. BTW- does anyone have a grandmaster game(with rated players, meaning at least 1970's) (non-blitz) that 1.f4 was played??

Not to totally argue with everything everyone has said in here :P BUT... From's gambit is definitely the most ambitious approach to 1. f4.  I personally use the From's whenever the opportunity presents itself.  The initiative gained for the pawn is consistently enough to get the pawn back with interest (ironically, modern engines, despite being incredibly materialistic, agree with this analysis).

eat cheetos and then DEMAND a draw