Wall, Bill - Anonymous
(analysis by Bill Wall)
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+
4...Kxf7 5.Nxe5+ Nxe5 6.d4 Qh4
One of a number of moves that keeps Black's advantage.
Aggressive, but 8...Bb6 was probably better. It was the choice of several computers ( Deep Shredder 10, Deep Sjeng 1.5, Hiarcs 11.1, Shredder Paderborn) in computer vs computer tournaments in 2002, 2003 and 2008, for example. It also appeared in Sir Osis of the Liver - perrypawnpusher, JG3 thematic, Chessworld.net, 2008 (0-1, 38) and Wall,B - Rajiv, Chess.com, 2010 (1-0, 33).
Giving the piece back is "scientific" but it leads to an equal game, according to Stockfish 7.
With 9...Bxe5 Black returned a Bishop, instead, in Sorensen,S - X, Denmark, 1888 (1-0, 27).
Another piece return was the wild 9...Nxf2 in Darthballz - Leftang, FICS, 2011, (1-0, 25).
Bill points out 9...Be7 10.hxg4 d6.
10.dxe5 Bxe5 11.Qd5+ Kf6 12.Re1 d6
Bill points out the tricky 12...Bd4 13.Nc3 Bxf2+ 14.Kh1 Bxe1 15.Bg5+, when Black will lose his Queen to either White's Bishop or Knight (when it comes to e4 with check).
13.Rxe5 dxe5 14.Qd8+ Ne7 15.Qxh8 Qe4
Instead, Black had the prudent 15...Kf7, both protecting his pawn at g7 and the square at f8. If he wanted an exciting draw, he could try 15...Bxh3!? 16.Qxa8 Bxg2 17.Kxg2 Qg4+ and he could repeat the position with Queen checks.
The bad news begins. The alternative: 16...Kg6 17.Qe8+ Kf6 (17...Kf5 18.Qf7#) 18.Nc3 Qxc2 19.Qf8+ Kg6 20.Qxe7.
Several other options, from Bill: 17...Ng6 18.Qg8+ Kd6 19.Qd8+ Kc6 20.Nc3 Qxc2 21.Qd5+ Kb6 22.Qb5# ; or 17...Qxc2 18.Qxe7+ Kf5 19.Qxg7; or 17...Nc6 18.Nc3 Qxc2 19.Qg8+ Kf5 20.Qxg7 Qxb2 21.Qf6#
Instead, 18.Nc3 Qxb2 leads to checkmate.
The White b-pawn is still poisonous, and 18...Qxb2 would again lead to checkmate.
Best is probably 18...Nf5, but it still leads to misery, e.g. 19.Qg8+ Kd7 20.Nc3 Nd6 21.Rd1 Qd4 22.Rxd4 exd4 23.Qxh7+ Kc6 24.Ne2 Nf5 25.Bd8 as Bill notes.
19.Qf6+ Kd5 20.Nc3+ Kc4
Or 20...Kd4 21.Be3+ Kc4 22.Qf7+ Be6 23.Qxe6+ Nd5 24.Qxd5#; or 20...Kc5 21.Qxe7+ Kc4 22.b3+ Kxc3 23.Qxe5+ Qd4 24.Bd2+ Kxd2 25.Qxd4+ Kxc2 26.Rd1 Rd8 27.Qd2#. Black's King is not coming back from this journey.
Or 21...Kd4 22.Rd1+ Kc5 23.Be3+ Qd4 24.Rxd4 exd4 25.Qxd4+ Kc6 26.Qc5#; or 21...Kc5 22.Qxe7+ Kb6 23.Qxb4+ Ka6 24.Qa3+ Kb6 25.Be3+ c5 26.Nd5+ Kc6 27.Qxc5#.
If 22...Kxc2 then 23.Rc1+ Kd3 24.Qe3#
Or 23...Kb2 24.Qxd4+ Kxc2 25.Rc1# ; or 23...Kxc2 24.Qxd4 Rd8 25.Rc1#
If 24...Ke2 25.Qe3#
Threatening 26.Qd2 mate