Analyses after 1.g4 f5

Reply 1....f5  is known as Alessi Gambit looks me very strange. But it does not mean that it is not playable, on the contrary it could be very interesting weapon for unprepared white. Below you can see two computer games played with time 3 hours for game + 1 minute bonus for each move on AMD 2000+ 64Mb Hash.

After 2.gxf5 (I thing only this is accetable) there are possibilities :

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3.e4 Qd6 (3....g6 4.fxg6 hxg6 5.Bg2 d4 (dxe4) 6.Qf3 e5 (Nc6) 7.Qg3 Qf6 8.d3 Nc6 (Bh6) 9.Nf3 (Bg5) Bh6 10.Bxh6 (Bg5) Nxh6 11.Nbd2 Nf7 12.h4 (0-0-0) Nb4 (Be6) 13.Ke2 Bd7 14.Nc4 (Bh3) Nc6 15.Bh3 0-0-0 16.Bxd7+ Rxd7 17.Rag1 (a4) Rh6 (Re8) 18.Qg4 (a4) b5 19.Ncd2 Nfd8 (Qe7) 20.Ng5 (h5) Nb4 (Rh8) 21.a3 Nbc6 22.Kd1 (h5) Qd6 23.f4 (Kc1) exf4 (Kb8) 24.Rf1 Ne5 (Qe7) 25.Qxf4 Rh8 (c5) 26.Ndf3 (Qf6) Ndc6 (Nec6) 27.Nxe5 Nxe5 28.Qf6 Qxf6 29.Rxf6 Rd6 30.Rf4 (Rxd6) Kb7 (a5) 31.Ke2 (Rh3) a5 32.Kf2 (Ra1) Rc6 33.Kg3 (Nf7) Rxc2 34.Ne6 (Nf7) Nxd3 (Rxb2) 35.Rf3 Rd2 36.b4 (Rf6) Ne5 (Re8) 37.Nc5+ (Rf2) Kb8 (Ka7) 38.Rf2 (Rff1) Rxf2 39.Kxf2 axb4 40.axb4 d3 41.Ke3 (Na6+) Rd8 42.Kf2 (Kd2) Nc4 43.Nb3 Rf8+ 44.Ke1 (Kg3) Rf3 45.h5 gxh5 46.Rxh5 c6 47.Nd2 (Rh8+) Re3+ 48.Kd1 Kc7 (Nxd2)  49.Rh7+ (Rh2) Kd6 50.Rh8 (e5+) Ke5 51.Rd8 Rh3 (Re2) 52.Ke1 Kf4 (Rh1+) 53.Nf1 Kxe4 54.Rd7 (Kf2) Ke5 (Ne3) 55.Rd8 (Kf2) Bb6 56.Kd2 Nd5 57.Rf8 Kd4 (Nxb4) 58.Rg8 (Rf2) Rh4 59.Rf8 Rg4 (Nxb4) 60.Kc1 Rg1 (Nxb4) 0-1, Shredder 9 - Toga II 1.1, 2005) 4.Qh5+ (Jc3) Kd8 5.d3 Nc6 (g6) 6.Nf3 (Qe2) g6 (Nf6) 7.fxg6 (Qh4) Nf6 8.Qh4 Bg7 (dxe4) 9.Ng5 Rf8 (Ke8) 10.gxh7 Nd4 (Qc5) 11.Na3 dxe4 12.dxe4 (c3) Bg4 (Qc5) 13.Bd3 Bh5 (Qc5) 14.Nc4 (Rg1) Qc6 15.f3 (Ne5) b5 16.Ne5 Qd6 17.Qxh5 (c3) Nxh5 18.Nef7+ 19 Kd7 (Ke8) 19.Nxd6 cxd6 20.c3 Nc6  21.Bxb5 Be5 (Rab8) 22.Bc4 Nf4 (Rab8) 23.Bxf4 Rxf4 24.Be6+ Kc7 25.h4 (Bg4) Rb8 26.0-0-0 (Bg4) Rbf8 (Kb6) 27.Bf5 (Rd5) Nd8 28.Rdg1 (Kd2) d5 (a5) 29.Rd1 (Kd2) dxe4 30.Rxd8 (fxe4) Rxd8 31.Ne6+ Kb6 32.Bxe4 Rh8 (Rxe4) 33.Nxf4 Bxf4+ 34.Kc2 Bg3 35.h5 (b4) Be5 36.Rg1 1-0 (Toga II 1.1 - Shredder 9, 2005)

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