Has this gambit (6.Ng5!) been played? (I only found games with 6.Ne5.) Is it any good? Is it the refutation of Black's silly 3...h5 (the Wagenbach Defense)?

[FEN ""]

1.e4 e5 2.f4 exf4 3.Nf3 h5 4.d4 g5 5.h4 g4 6.Ng5 f6 7.Bxf4 fxg5 8.Bxg5 Be7 9.Qd2

From my analysis, the line you give appears to be the best way White can play. After 9.Qd2, Stockfish 10 at depth 28 gives roughly +1. So I think it qualifies as a refutation of 3...h5.

I couldn't find any games where 6.Ng5 was played, but I did find a game that reached the same position on move 6 via transposition. The game was from 1788 (!) in the "London Casual Games" between two players named Cotter and Von Bruehl:

[White "Cotter"]
[Black "Von Bruehl"]
[Event "London Casual Games"]
[Date "1788"]

[fen ""]

1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h5 6.d4 {Transposing to the diagram you gave} f6 7.Bxf4 fxg5 8.hxg5 (8.Bxg5 {Is stronger, following your line}) d5 9.e5 Bf5 10.Bd3 Ne7 11.O-O Bg7 12.Bg3 Rf8 13.Bh4 Qd7 14.Nc3 a6 15.Qe2 Nbc6 16.Bf2 O-O-O 17.Na4 Bxd3 18.Qxd3 Nxe5 19.Qb3 b5 20.dxe5 bxa4 21.Qc3 d4 22.Qd3 Qb5 23.Qa3 Ng6 24.b3 Bxe5 25.bxa4 Qc6 26.Rab1 0-1.
  • Thank you very much for this excellent answer! For a moment there I thought of calling it the Cotter Gambit, but not after Cotter's weak follow-up. – bof Sep 3 at 7:39
  • Is White's advantage smaller (according to the engine) if he simply plays the positionnal 4.h4 after 1.e4 e5 2.f4 ef4 3.Nf3 h5? – Evargalo Sep 3 at 9:15
  • After you gave me the idea of looking for transpositions from the Allgaier Gambit, I found another one. (There shouldn't be very many, because after 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h5 the normal move is 6.Bc4! not 6.d4.) – bof Sep 3 at 12:51
  • I found this in Colin Leach's booklet KGA: Allgaier and Kieseritzky Gambits. J. Weiss–von Gompers, Vienna 1906. 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h5 6.d4 f6 7.Bxf4 fxg5 8.hxg5 d6 9.Nc3 Bg7 10.Qd2 Ne7 11.O-O-O Ng6 12.g3 Nc6 13.Bb5 Bd7 14.Bxc6 Bxc6 15.Rhe1 Qe7 16.Nd5 Qf7 17.c4 O-O-O 18.rf1 Qd7 19,Qa5 Kb8 20. c5 Bxd5 21.exd5 h4 22.Rd3 Qf5 23.Qxc7+ Kxc7 24.Bxd6+ Rxd6 25.cxd6+ Kxd6 26.Rxf6 h3 27.Rxf5 h3 28.Rf1 h2 29.Rh1 Bxd4 30.Rd3 Bf2 31.Kd1 Rh3 0-1 – bof Sep 3 at 12:51
  • @bof interesting, so from what we've found it appears no one has ever played the stronger 8.Bxg5. – Inertial Ignorance Sep 3 at 18:31

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