Jerome Gambit: Deep Dive (Part 2)

[continued from the previous post]

ZahariSokolov - GizmoClass
FICS, 2019

The game is unblanced and getting more complicated by the move: both Queens are out, both Kings are uneasy. Black should try 10...Ne7, but he prefers to unblock his d-pawn, to allow him to develop his light-squared Bishop. White presses his attack. (Luckily, I have Komodo 10 to help explain things.)

10...Kc6 11.Qd5+ Kb6 12.Nc3 

White knows that he has the advantage, and that his focus is the enemy King. Development seemed most helpful, although Komodo 10 liked a few Queen checks followed by a pawn strike, instead: 12.Qb3+ Ka6 13.Qa4+ Kb6 14.b4!? when the Bishop will fall, one way or another. (Or, maybe not. Komodo 10 suggests that after 14...Bf2, White probably does best to play 15.Nc3, after which things continue 15...a6 16.Qa5+ Kc6 17.b5+ Kd6 18.Qb4+ c5 19.bxc6+ Kxc6 20.d4 when things are a royal mess, but the computer believes White to be better.)

12...Ne7 

In turn, Black would have done much better to move a pawn, first, tossing the extra piece to get his monarch some safety: 12...c6 13.Na4+ Kc7 14.Qxc5 Qxf4 15.Qf2 d6 and White is only up a pawn. 

13.Na4+ Ka5 

This is the kind of position that screams: tactics! White now has a checkmate - how?

14.Qb3

Another good move, although missing the better 14.b4+ Kxa4 15.Qb3+ Kb5 16.a4+ Kb6 17.bxc5+ Kxc5 18.Ba3+ Kc6 19.Qb5 checkmate. Nice.

14...Qh5 

Black protects his Bishop - and dreams of threatening ...Qxf3+, winning a Rook, if White ever leaves the pawn unprotected, or if he blocks his Queen's protection of f3 with Nc3 or c3 or d3.

15.Rf1 

The reasoning behind this move is unclear. White's best was probably 15.c4 c6 16.d4 and White's pressure would increase. As it is, Black gets a slight breather.

15...b5 16.Nxc5 

White could have grabbed a piece back with 16.Qc3+ b4 17.Qxc5+ Qxc5 18.Nxc5. 

16...Qxc5 

17.d3 d5

Overlooking a tactic.

18.Bd2+ Kb6 19.a4 

Missing the skewer 19.Bb4, winning the Knight on e7.

[to be continued]

Jerome Gambit: Deep Dive (Part 1)

It has been a while since I took a deep dive into a Jerome Gambit game, so I decided to inspect a 2019 game played by ZahariSokolov, online at FICS. He has 410 games in The Database, scoring 50%. Many of his games explore important lines, and can be quite complicated.

ZahariSokolov - GizmoClass
FICS, 2019

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6

What could be more understandable than wanting to hold on to your extra 2 pieces? It is too early in the game to assess whether GizmoClass is naive or knowledgeable in making this move choice. (The Database has 1,121 games with this position; White scores 54%.)

7.Qf5+ Kd6 8.f4 Nf3+ 

Aha! The player of the Black pieces knows a bit about the Jerome Gambit, or he has a solid creative streak about him.

This Norton Defense, which first appeared in Jerome - Norton, correspondence, 1876 (0-1, 42), was referred to as "a new departure" in the September, 1876 issue of the American Chess Journal. "[...Qf6] is the usual play. The text move prevents White from castling."

The "usual play" appeared in Alonzo Wheeler Jerome's analysis of the Jerome Gambit that appeared in the April 1874 issue of the Dubuque Chess Journal; as well as in the games Jerome - Shinkman, Iowa, 1874 (0-1, 21) and Jerome - Brownson, Iowa, 1875 (1-0, 43).

The text move, 8...Nf3+, can be found in 14 games in The Database, with White scoring a deceiving 71% (Komodo 10 assesses the position as even). It can be contrasted with 8...Qh4+ 9.g3 Nf3+ , the "Nibs" defense, which dates back at least as far as 1899. (The Database has 54 games; White scores 54%.)

Interestingly enough, despite Black's apparent knowledge of the Jerome Gambit, only one other game by GizmoClass appears in The Database - a 83-move draw (6...Kf8) played against ZahariSokolov, 6 months earlier. Did somebody "book up", afterwards?

9.gxf3 

Capturing the Knight is best, but even the Gambit's creator slipped and chose 9.Kf1 in a game, instead: 9...c6 10.gxf3 Qe7 11.b4 Bb6 12.Bb2 Kc7 13.Qe5+ Qxe5 14.Bxe5+ d6 15.Bxg7 Bh3+ 16.Ke2 Bg2 17.Rd1 Ne7 18.Bxh8 Ng6 19.d4 Rxh8 20.Kf2 Nxf4 21.c3 Rg8 22.Nd2 Kd7 23.Ke3 Rf8 24.Rg1 Bd8 25.Kf2 Rg8 26.Ke3 Nh3 27.f4 Nxg1 28.Rxg1 Rg4 29.Nf1 Bh3 30.Ng3 Rh4 31.Nf5 Bxf5 32.exf5 Bf6 33.Rg3 Rxh2 34.a4 Rh1 35.a5 Re1+ 36.Kf3 Re7 37.Rh3 c5 38.bxc5 dxc5 39.Rh6 cxd4 40.cxd4 Bxd4 41.f6 Rf7 42.Ke4 Bxf6 and Black won, Jerome,A - Norton,D, correspondence, 1876.

To be fair, I should mention that I have played 9.Kf1 a couple of times, too - perrypawnpusher - igormsp, blitz, FICS, 2011 (1-0, 13), and perrypawnpusher - rheapennata, blitz, FICS, 2012 (1-0,12) - and ZahariSokolov has gotten away with 9.Kd1, as well in  ZahariSokolov - LAVAL, FICS, 2015 (1-0, 32). I have already argued, elsewhere, that "Good luck is better than a license to steal."

9...Qh4+ 10.Kd1

An earlier mistake that he shied away from was 10.Ke2, as in ZahariSokolov - Quarte, FICS, 2015 (0-1, 17); but it is hard not to enjoy the follies of an early computer against Jack Young: 10.Ke2 Qf2+ 11.Kd3 Qxf3+ 12.Kc4 b5+ 13.Kxb5 Rb8+ 14.Ka5 Bb4+?! 15.Ka4 Qxh1?? 16.Qe5+ Kc6 17.Qd5+ Kb6 18.Qxb5 checkmate

How should Black proceed?

Of course, 10...Qe7 11.Qd5 checkmate, is not optimal, at least for the defender, ZahariSokolov - GhengusFungus, FICS, 2014. 

Instead, 10...Qf2 allows White to sue for peace by initiating repeated checks, e.g. 11.Qe5+ Kc6 12.Qd5+ Kb6 13.Qb3+ Ka6 14.Qa4+ Kb6 15.Qb3+ Kc6 16.Qd5+, etc. Actually, the American Chess Journal editor William Hallock, commenting on Jerome,A - Norton,D, correspondence, 1876 (see above) wrote that after 10...Qf2 "Black has the better position". I challenged this notion in perrypawnpusher - Sir Osis of the Liver, Jerome Gambit 3 thematic tournament, ChessWorld.net, 2008, and, when my opponent was unwilling to split the point, I went on to win (1-0, 19).

ZahariSokolov had already faced 10...Nf6, which led to an edge for White, but he lost after an unusual and unfortunate oversight: 11.e5+ Kc6 12.exf6 d6 13.Nc3? Bxf5 14.d3 gxf6 15.a3 Qf2 16.Bd2 Qxf3+ 17.Kc1 Be3 18.Bxe3 Qxe3+ 19.Kb1 Qxf4 20.Ka2 Be6+ 21.b3 Qd2 22.Kb2 Rhg8 23.Ne4 Qe3 24.Rae1 Qd4+ 25.Ka2 Bxb3+ 26.Kxb3 Rg2 27.Rd1 Qb6+ 28.Kc3 Rag8 29.Nxf6 Qa5+ 30.Kb3 Qb5+ 31.Kc3 Qe5+ 32.d4 Qxf6 resigned, ZahariSokolov - panpanOneTwo, FICS, 2018.

Best is probably 10...Ne7, but that is not what GizmoClass played.

 [to be continued]

Jerome Gambit: Checkmate the King

It is good to remember that your ultimate goal is to checkmate the enemy King. If you have some fun along the way, so much the better.

JoeBau - sailingsoul
FICS, 2019

1.e4 e5 2.Nf3 Nc6 3.Bc4 h6 

The Semi-Italian opening. It is sometimes referred to as the "Anti-Fried Liver Defense", aimed at preventing a White Knight from moving to g5, i.e. 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7 Kxf7

4.Nc3 Bc5 5.Bxf7+ 

Now we have the Semi-Italian Jerome Gambit

5...Kxf7 6.Nxe5+ Nxe5 7.Qh5+ Ke6 

Black would like to hold on to his extra material. He has a few games in The Database, so, perhaps he sees the position as simply a "standard" Jerome Gambit - with the addition of ...h6 and Nc3.

(By the way, in 6 out of his 8 games with the White pieces, he played Nf3-g5, which may reflect on his interest in ...h6, as a defensive move, as indicated in the note, above.)

8.Qf5+ Kd6 9.Nb5+ Kc6 10.Qxe5 Kxb5 11.a4+ 

Well played: the target is the King. It would be out of place to pawn-grab with 11.Qxg7, which would be well met by 11...Qf6, with Black advantage.

11...Kc6

Safer was 11...Ka6 12.Qxc5 b6 and the King will find refuge at b7.

12.Qd5+ Kb6 13.b4

Nice: Black's Bishop can not move without allowing checkmate at b5 - or can it? It is not immediataly clear that 13.a5+ Ka6 should have been interpolated, first. 

13...Bxf2+ 

This is very interesting. The defender returns material; this can be followed by a timely ...a5, giving the King an escape square at a7 - that is why 13.a5+ was best, earlier, to chase the King over to block that move.

14.Kxf2 Qf6+

Not all Queen checks are the same. The only one that escapes checkmate is 14...Qf8+, controlling the c5 square, e.g. 15.Ke2 a5 16.Qd4+ c5 17.bxc5+ Kc6 when White has compensation (safer King, better development) for his sacrificed material (2 pawns for a piece). 

15.Ke2 c6 16.Qa5 checkmate