1.e4 f5 is the Fred opening, and a weak one at that!

Take a look at the GK database. This is called the Swiss Gambit. It scores well for white, but not definitively.

ok tks !

Why? 2...f5xd4, 3. Qh5+, g6 4. Qe5, Nf6 (defended by e7), and I don't see white's trick... the database says 3. d3, but black seems able to defend if he doesn't get greedy and goes e4xd3 (also playable).

2...f5xd4, 3.d3 e4xd3 4.Bf3xd3... 5.qh4 g6 6.Bd3xg6 ...etc

The bishop had an important role in victory, in fact, but this is due to black's mistake. As a general principle, to develop the bishop where it can be easily attacked by a strong move as d5 seems not wise at all. True is white wins a tempo for castling, in return, and move developement...

yes, i know but i wanted to treat this a2/g8 diagonal. It's part of my plan. The "strong defense d5 is not definitive. See after what happens. And anyway i had to move this bishop, so where do i had to put it ? e2 is to much defensive, there is no good attack in this way. d3 is bad move : it blocks the d2 pawn and the c1 bishop. b5 would be refuted more strongly instead with no good retreat...so ? With this move i lose a tempo, but i win a good tactical and agresive position.

Arguable. Black has a strong c5 to play, so maybe d4 would have been wiser. This keeps d4 for the knight, but exactly then is when c5 becomes stronger, specially after a6.

I effectively feared c5, difficult choice ...

c5 was probably better, ensuring developement of the somewhat squeezed queen side (Nc6 is bad because it blocks the strong c pawn, but the lsb has no good square unless b6, Bb7 or a6).

i agree, this should be an "inacurate" move

Be6 is a better move, in my view, since black needs to mobilize its queenside. Black's control on the e column is tiny, since white has Ne5 (once supported by e4), that blocks black for a while. So no problem in shielding to its own rook the column.

No, except Bd2 - but it is a dull move as well. Another idea could have been Nc3-e2, so to go for c4. But this doesn't seem a good plan either. With d4, white has already Ne5, after which the white's dsb is free to go to e3, its best place. But your plan is good, and NOT only because of b4 contrasts c5, but because after it white can play Bb2 (once defended the f4 pawn), then Bb2. If this goal is reached, white can claim he was right not to play d4 - but against a good game by black, he won't get there in time.

i should anticipate 12. ... Ng4

Of course you realize that with some more experience, you'll see this plan from the very moment he played c6, and you found d4 as the blocking move, and checked that it was all right after it. Black's attack is not very dangerous, indeed, but yoy have to be "sure" of that before allowing him to go for it.

Qe2 and the black's knight is pinned to the rook. Black has to lose a tempo defending the rook and white can take the knight and still has time to move the queen to f2 before black can attack the pinned bishop. Black must wait for white to kick his knight with h3, weakening the pawn and losing a tempo in the process. Nf8, instead, looks good, aiming to e6 or g6, freeing the bishop to e7, and attacking white's half-isolated pawns.

great ! tks

I told Kf8 would have been better. A very nice and sharp game. White was tactically accurate (even if sometime by chance  , but overall a wonderful game (I'll advice you to propose it for Game Of The Month contest - look forums, most active threads). Take in mind that not always people is 100% on chess when playing blitz, specially unrated ones...  

chance is part of the life. And sometime what we call "chance" is something more like "intuition" or like "unconscious calculation". About blitz : Ialway think that blitz is very serious game, contrary to what many say, the same kind of diference between a marathon and a 100m course...you see what i mean ? Is not the same performance.