Traps and Zaps

It's always fun to see where the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) turns up. Most recently, it was in IM Gary Lane's latest book (see "The extraordinary and forgotten Jerome Gambit"), but 20 years ago it was in Bruce Pandolfini's Chess Openings: Traps and Zaps.
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ g6 7.Qxe5 d6

A defense made famous by Joseph Henry Blackburne (see "Nobody expects the Jerome Gambit!" and "Flaws (Part II)") and most recently explored on this blog in "Jerome Gambit: Drilling Down" (3), (4), (5), (6), (7), (8), (9) and (10).

8.Qxh8 Qh4 9.d4

An improvement suggested by Munoz and Munoz in the August 1885 Brooklyn Chess Chronicle, repeated by Fletcher in Gambits Accepted (1954) and Druke in the November 1987 Gambit Revue, to give some early citations. (Actually, the move is rarely mentioned, but see "A Closer Look (Part V)".)

9...Nf6

Druke gave this move as an alternative to Fletcher's 9...Qxe4+ 10.Be3, saying that it came from analysis by Fritz 5. Of course, the two lines can transpose; in either case, as Hindemburg Melao, Jr., wrote in an intenet article (2003) on Amateur - Blackburne, London 1885 (not currently available), White's proper response is Nd2.

10.dxc5

Pandolfini appears to be the first to explore this move, and he uses it in a bit of a morality tale (after a few more moves) about grabbing material in his Chess Openings Traps and Zaps.

10...Qxe4+ 11.Be3 Qxg2 12.Rf1

Scenario: Don't be misled by White's extra Rook. It's a meaningless ornament. White is in serious trouble. His King is exposed and his cornered Queen is in danger of being trapped. The cruncher is 12...Bh3 which wins White's Queen by discovery form the a8-Rook. If White tries to save the Queen by capturing the Rook, 13.Qxa8 then 13...Qxf1+ 14.Kd2 Ne4 is mate.

Interpretation: White began with a very aggressive, sacrificial line of play which, because of Black's cavalier pawn move (6...g6), led to the gain of material. The price White had to pay was the removal of his Queen from the center of the board. Without his Queen being available for defense, White has to play carefully, and every move becomes critical. Instead of his h1-Rook, he should be more concerned with the potential trap of his Queen. The correct response to 11...Qxg2 is 12.Nc3 which later prevents Black's Knight from moving to e4 and giving mate. After 12...Qxh1+ 13.Kd2 Qxa1?(13...Qxh2 keeps Black's Queen in play), White turns the tables with 14.Bd4!. Black's extra Rook then means little in the face of White's strong counterattack.

Melao's analysis 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+? Kxf7 5.Nxe5+ Nxe5 6.Qh5+ g6 (!!?) 7.Qxe5 d6 8.Qxh8 Qh4 9.d4 Nf6! ( 9...Qxe4+ 10.Be3 Nf6 11.Nd2 Qxg2 [11...Qxc2 12.0-0+-] 12.0-0-0+-) 10.Nd2!
a)10.dxc5 Qxe4+ 11.Be3 (11.Kd1 Bg4+ -+; 11.Kf1 Bh3 12.Qxa8 Bxg2+ 13.Kg1 Bh3 -+) 11...Qxg2 12.Rf1 Bh3 -+;
b)10.Be3 Bxd4! 11.Bxd4 Qxe4+ 12.Kd2 (12.Be3 Qxg2 -+) 12...Qxd4+ 13.Kc1 Qc5 14.b4 (14.Na3 b5 15.Re1 Bb7 -+) 14...Qc4 15.c3 (15.Na3 Qf4+ 16.Kb1 Qxb4+ -+) 15...b5 -+;
c)10.e5 dxe5! 11.0-0! Bd6! (11...Bxd4 12.Nd2 e4! 13.Qd8 Be5 14.g3 [14.f4 Bf5! 15.Qxa8 Bd4+ 16.Kh1 Ng4 17.h3 Qg3 18.hxg4 Qh4#] 14...Qh3 [14...Qg4 15.Nc4] 15.Nxe4! Qxf1+ [15...Nxe4 16.Qd5+] 16.Kxf1 Bh3+ 17.Ke1 Rxd8 18.Ng5+ Kg7 19.Nxh3 unclear) 12.f4 (12.Nd2 e4 13.g3 [13.f4 b6 -+] 13...Qh3 14.f3 e3 15.Ne4 Nxe4! 16.fxe4+ Qxf1+! 17.Kxf1 Bh3+ 18.Ke2 Rxh8 -+) 12...e4! 13.g3 Qh5 14.f5 gxf5 15.Bf4 Bxf4 16.Rxf4 [16.gxf4 e3 -+] 16...Qd1+ 17.Kg2 [17.Rf1 Qxd4+ 18.Kg2 f4 -+] 17...e3! 18.Qd8 Bd7! [18...e2! 19.Qxc7+ Kg6 20.Nc3! e1N+ 21.Kh1 Qxa1 22.Rf1! Be6 23.g4! fxg4 (23...Nxg4 24.d5) 24.h4! (24.Qe5 Nf3)] 19.Qxc7 (19.Qxa8 Bc6+ 20.Kh3 Qh5+ 21.Rh4 Bg2+! 22.Kxg2 Qe2+ 23.Kg1 [23.Kh3 Qf1#] 23...Qf2+ 24.Kh1 Qf1#) 19...Rc8 20.Qxb7 Rxc2+ 21.Kh3 Qh5+ 22.Rh4 Qe2 23.Qh1 f4+ 24.g4 Bxg4+ 25.Rxg4 Qxg4#;
10...Bxd4 11.0-0! (11.g3 Qh5 12.Qd8 Bxf2+! 13.Kxf2 Qc5+;11.Rf1 b5 [11...Bh3! 12.Qxa8 Bxg2 13.Qxb7! Bxf1 14.Qb3+! d5 15.Qg3] 12.Qd8 Bb6 13.e5 dxe5 14.Qd3 Qxh2 [14...e4 15.Qg3 +/=] 15.Qf3 Rb8 16.Ne4 Qh4 17.Nxf6 Qxf6 18.Qxf6+ Kxf6 unclear)