Further Exploration

Here is another Jerome Gambit exploration by Philidor1792, tackling an annoying defensive variation (for a game, and a discussion by MrJoker, see "Theory From the Thematic Tourney" Part 3 and Part 4), battling with his opponent and prevailing.

Philidor1792 - NN
Casual game, 2012

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 7.f4 d6 

8.fxe5 dxe5 9.Qh3+ Ke7 

9...Kd6 was seen in Yace Paderborn - RevvedUp, 2006 (1-0, 48) and Morin,L-Dumont,F, Montreal, 2011 (0-1, 57). 

10.Qg3 Kf7 11.Qxe5 Qh4+ 

Other choices by Black (all in The Database):

11...Qd6 in Wall,B, - Qi,H, Chess.com, 2011 (1-0, 14); 
11...b6 in Wall,B - Redom,T, Chess.com, 2010 (½-½,59); 
11...Bd4 in Fritz 5.32 - Junior 7, The Jeroen Experience, 2003 (0-1, 32)

12.g3 Qe7 13.Qxe7+ 

Or 13.Rf1+ in Colossus - Rybka v1.0 Beta.w32, USA, 2006 (0-1,42).

13...Nxe7 14.c3 Bb6 15.d4 Ke8 

Here we have a typical Jerome Gambit Queenless middlegame/endgame, where Philidor1792 wants to make the most of his "Jerome pawns".

16.Be3 Nc6 17.Nd2 Ne5 18.Kd1 Ng4 19.Ke2 Be6 20.Bf4 Kd7 21.Raf1 Raf8 22.h3 Nf6 23.Kd3 Kc8 24.Re1 Nh5 25.Be5 Rf7 26.Rhf1 Nf6 

White patiently maneuvers and improves the placement of his pieces.

27.g4 Nd7 28.Bg3 Rxf1 29.Rxf1 a6 30.Nc4 Ba7 31.b3 h5 32.Ne3 hxg4 33.hxg4 Bb6 34.Rf3 Nf6 35.g5 Nh5 36.Be5 Kd7 

37.Nf5 Rf8 38.c4 Bxf5 39.exf5 c6 40.Ke4 Rf7 

A slip, but the game remains drawish..

41.Rh3 c5 42.Rxh5 cxd4 43.Bxd4 Bxd4 44.Kxd4 Rxf5 

45.Ke4 Ke6 46.b4 Re5+ 47.Kd4 b6 48.Rh8 Rxg5 49.Rb8 Rg4+ 50.Kc3 Rg3+ 51.Kd4 Rg4+ 52.Kc3 Rg3+ 

Has White reached his goal of an endgame draw with the Jerome Gambit?

53.Kb2 

No!

White wants more.

This seems to upset Black, who soon settles for less.

53...b5 54.Rb6+ Ke5 55.cxb5 axb5 56.Rxb5+ Kd4 57.Rc5 g5 58.a4 g4 59.a5 Rg2+ 60.Kb3 Rg3+ 61.Ka4 Rg1 62.Kb5 g3 63.a6 Ra1 64.Rg5 Ra3 65.Kb6 Black resigned

Got A Match?

It was not long after I began looking into the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) that I noticed one chess match kept turning up in the databases: in 1993, between the human Micah Fischer-Kirshner and the chess-playing program KnightStalker, an early version of Fritz. As luck would have it, I was able to interview Micah about his experience for this blog.

The Jerome Gambit seemed a natural for matches, especially ones involving computers. Jeroen_61 of the Netherlands ran one with Hiarcs, Junior 7, Shredder Paderdorn (6.02) and Fritz 7.

I tried a few myself, notably a Fritz8 vs Fritz5 encounter and a Delphi vs Wealk Delphi contest. Each attempt had its shortcomings. (Perhaps you read about them here.)

The mysterious "perfesser" played an introductory 4-game match with the Talking LCD Chess Gadget. Like the Jerome Gambit itself, it was good for some chuckles.

Topping all efforts so far, "RevvedUp" and his trusted companions Hiarcs 8, Shredder 8, Yace Paderborn, Crafty 19.19 and Fritz 8 explored the Jerome Gambit in a 30-game encounter. It was simply war.

And then there is that as yet untold tale of two expert-to-master-level American players who played a Jerome Gambit match 5 years ago, but the games remain hidden from public view, pending the players' release of a monograph on the opening...

Perhaps that will show up on this blog one of these days.






























http://jeromegambit.blogspot.com/2008/11/jerome-gambit-and-perfesser-part-i.html


iv

LPDO Revisited

In "My House! My House! My Kingdom for a House!" I mentioned Grandmaster John Nunn's acronym, LPDO, as a reminder that "Loose Pieces Drop Off". In the following game, Jerome Gambit Gemeinde member HauntedKnight takes that notion into account when planning his play, and it helps him grab a "loose" Knight. Black's resignation, only a pawn down, might be a bit early, but it is easily understood.

HauntedKnight - OneNoTrump
blitz, FICS, 2011

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

4...Kxf7 5.Nxe5+ Nxe5 6.d4 Bb4+

Computers tend to like this move, for their own computer-ish reasons. For examples, see "Jerome Gambit: Drilling Down (1)" for RevvedUp's 2008 tag-team match against Hiarcs 8, Shredder 8, Yace Paderborn, Crafty 19.19 and Fritz 8, where this move showed up, played by Crafty. It also appears in Jeroen's earlier 2003 Jerome Gambit computer tournament in the game Deep Sjeng 1.5 - Hiarcs 9.

If the computers are given enough time they often find the recommended 6...Qh4!? as well.

Has OneNoTrump examined the Jerome Gambit with a computer, or is this a knee-jerk reaction (my Bishop is attacked, move it and attack White)?

7.c3 Bxc3+

A clue: this looks like a human decision. The 75 games that have this move in The Database all have a person playing Black.

Computers realize, of course, that Black must return a piece, and suggest something like 7...Ng6/c6 8.cxb4 to mess up White's pawns a bit; or they let White choose which piece he wants by playing 7...Qh4. 

8.bxc3

Bolstering White's center, but 8.Nxc3 was probably a bit better: development and all that.

8...Nc4 9.Qh5+ g6

Reflex. 

Better was 9...Kf8 and Black keeps his edge, even against 10.Qc5+ Nd6 11.e5, because he has 11...b6 12.Qb4 Qe7 when after 13.0-0 the Knight escapes with 13...Nf7. 

10.Qd5+ Black resigned

The loose piece at c4 will drop.

Nudge 2.0

The other day Bill Wall told me that there were 5 Jerome Gambit games (out of over 4.8 million) in the new Big Database 2011 from ChessBase. It turns out that 2 of them were unknown to me. Here's one.

Kitzler,G - Schloeffel,C
Karl Mala Memorial FICS, 2009

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

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ng6

7.Qxc5

Instead of this direct capture, I prefer the "nudge" 7.Qd5+ which usually pushes Black's King to the back rank, where it can interfere with the development of his King Rook. It costs me an extra tempo, but Black returns it with a later ...Kf7 or ...Ke7.

7...d6 8.Qd5+

I suppose that this move could be a "nudge 2.0" as it either moves Black's King, or the Queen's check is blocked by Black's light-squared Bishop, which in turn makes the b7 pawn available for capture.

How good is the move? Well, there are 127 games with it in The Database, and White scores only 37%. On the other hand, the move has been played by Jerome Gambit stalwarts blackburne, AAlekhine and Bill Wall, and was chosen by computers Crafty 19.19 and Yace Paderborn in their games against RevvedUp.

8...Be6 9.Qxb7

Black willingly gives up the pawn and White happily takes it. At least one of them apparently remembers what happens to one who takes the Queen's Knight pawn...

As in many Jerome Gambit positions, Black is "objectively" better, but if White can consolidate his position (he is behind in development and his King is not safe) then in casual or club games White's extra 3 pawns may be able to balance out Black's extra piece.

9...Nf4

Two other possibilities:

9...Nf6 10.d4 Re8 11.Nc3 Qc8 12.Qb5 Bd7 13.Qd3 Nxe4 14.0-0 Kg8 15.Bg5 Nxg5 16.Rae1 c6 17.Qc4+ d5 18.Qd3 Rxe1 19.Rxe1 Bf5 20.Qd2 Ne4 21.Nxe4 Bxe4 22.f3 Bf5 23.g4 Bxg4 24.fxg4 Qxg4+ 25.Kh1 Nh4 26.Qe2 Qxe2 27.Rxe2 Rf8 28.h3 Kf7 29.Re3 Re8 30.Rxe8 Kxe8 31.c3 Ke7 32.Kg1 Ke6 33.Kf2 Kf5 34.Kg3 g5 35.a4 h5 36.b3 Ke4 37.Kf2 Kd3 White resigned, blackburne - meliam, ChessWorld, 2004; and


9...Nh4 10.0-0 Qg5 11.Qxc7+ Ne7 12.g3 Nf3+ 13.Kh1 Qh6 14.h4 Bh3 15.Rd1 Qe6 16.Qa5 Bf1 17.Qh5+ Ng6 18.Qxf3+ Kg8 19.Rxf1 Qh3+ 20.Kg1 Ne5 21.Qb3+ d5 22.Qxd5+ Nf7 23.Qxa8+ Black resigned, Wall - CheckMe, Chess.com, 2010.


Players who return to this line also need be aware of the unplayed 9...Qg5!? Trust me, the Black Rook on a8 is poisoned. White has to try 10.g3. 

10.0-0

This move seems prudent, but it actually opens up Pandora's box. White had to find 10.Rg1 and hold on, as Black has both quiet and wacky responses (try 10...Bd5!?) to try to increase his advantage.

10...Bh3

Okay, take a deep breath.

Black, as is the case in many Jerome Gambit games, has missed the killing stroke 10...Qg5, as 11.g3 causes horrible weaknesses on the white squares around White's King, i.e. 11...Ne2+ and 12...Qh5.

Instead, Black has gone in for flash (taking the Bishop now leads to a quick mate), and that means White has an extra chance. He should try 11.Qb3+, hoping for something like 11...d5 12.d4 Qg5 13.Qg3 Ne2+ 14.Kh1 Nxg3+ 15.fxg3+ Qf6 16.Rxf6+ Nxf6 17.gxh3 Nxe4 when White has two pawns for the exchange and Black will have to work for a win.

After 11.Qb3+ Ke8 12.Qb5+ White should probably exchange Queens if he has the opportunity and otherwise work on his development, again hoping that his 3 extra pawns will come to his rescue.

11.e5

Opening the route to g2 for his Queen, but now his game completely collapses. It is probably time to draw the curtain on this tragedy.

11...Bxg2 12.Qb3+ Bd5 13.e6+ Kf8 14.Re1 Bxb3 15.e7+ Nxe7 16.axb3 Nf5 17.Kh1 Nh3 18.d3 Qh4 19.Rf1 Nxf2+ 20.Kg2 Re8 21.Rxf2 Qg4+ 22.Kf1 Qh3+ 23.Rg2 Qf3+ White resigned

White's undeveloped Queenside tells the tale.


graphic by Jeff Bucchino, the WizardofDraws

Theory From the Thematic Tourney (3)

One problem with a refuted opening like the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) is that it is refuted... That means that there are lines that Black can play that lead to equality – or more. In some of those lines White can complicate things and hope to take advantage of the confusion. In other lines it is not so easy for White to "find something".

Luke Warm - Daves111
Jerome Gambit Thematic Tournament,
ChessWorld, 2010

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 7.f4 d6 8.fxe5 dxe5

This defense, a favorite of computer chess programs, gives back a piece to drain the dynamism out of the position.

In the gruelling "Jerome Gambit: Drilling Down" matches between human RevvedUp (a pseudonym) and Hiarcs 8, Shredder 8, Yace Paderborn, Crafty 19.19 and Fritz 8, the flesh-and-blood player twice scored draws with Black from this position against opponents rated 1,000 points higher than him. 

The updated New Year's Database shows that White has tried 9.b4, 9.c3, 9.d3, 9.d4, 9.Nc3, 9.Rf1, 9.Qe2, 9.Qf5+, 9.Qg4+ and 9.Qh3+.

In the current game, Luke Warm decides to try a Queenless middlegame, but he finds nothing but trouble.

9.Qf5+ Kd6 10.Qf3 Qh4+ 11.g3 Qg4 12.Qxg4 Bxg4

13.Nc3 Rf8 14.d3 Bh3 15.Bd2 Bg2 16.Ke2 Bf3+ 17.Ke1 Bxh1 18.Ke2 Rf2+ 19.Ke1 Rxh2

20.Nb5+ Kd7 21.b4 Bf2+ 22.Kd1 Bxg3 23.c3 Bf3+ 24.Kc2 Nf6 25.a4 a6 26.Na3 Bf4 27.Rd1 Bxd1+ 28.Kxd1 Rxd2+ 29.Ke1 Black resigned

Jerome Gambit: Drilling Down (30)

In the last game in this "human vs computers" Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) match, Yace Paderborn seems headed for the draw that Crafty 19.19 and Hiarcs 8 had found before it, when RevvedUp decides to vary – after all, his position is better.


Unfortunately, that gives the silicon beast the opportunity to lengthen the game and eventually outplay its human opponent.

Yace Paderborn - RevvedUp
blitz 2 12, 2006

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6
7.f4 d6 8.fxe5 dxe5 9.Qh3+

Kd6 10.Qd3+

10...Ke7 11.Qg3 Kf7

The draw comes with 11...Kd6, when Yace Paderborn likely would repeat with 12.Qd3+, etc. Perhaps RevvedUp was aware of a couple of previous examples of this line of play – where Black won.
12.Qxe5 Bd4

Colossus - Rybka v1.0 Beta.w32, Jerome Forced Computer Chess Match USA, 2006, transposed to this line, but saw ...Qh4+ here instead: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 7.f4 d6 8.fxe5 dxe5 9.Qh3+ Ke7 10.Qg3 Kf7 11.Qxe5 Qh4+ 12.g3 Qe7 13.Rf1+ Kg6 14.Qxe7 Nxe7 15.c3 Bh3 16.Rf4 Bd6 17.Rh4 Bd7 18.d4 Rae8 19.e5 Nd5 20.a3 Be7 21.Re4 Bf5 22.Re2 Bd3 23.Rg2 Rhf8 24.Bf4 c5 25.Nd2 Kh5 26.Rc1 Nxf4 27.gxf4 Rxf4 28.Kd1 Rg4 29.Rxg4 Kxg4 30.b4 Rf8 31.bxc5 Rf2 32.h3+ Kxh3 33.Rb1 Bxb1 34.Nxb1 Rf1+ 35.Kc2 Rxb1 36.Kxb1 h5 37.d5 Bxc5 38.d6 Kg4 39.Kc2 h4 40.Kd3 h3 41.Kc4 b6 42.d7 Be7 White resigns

13.Rf1+ Nf6 14.Qh5+ Ke7

Junior 7 preferred ...Kg8: Fritz 5.32 - Junior 7, Jerome Gambit The Jeroen Experience (1.1), 2003: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 7.f4 d6 8.fxe5 dxe5 9.Qh3+ Ke7 10.Qg3 Kf7 11.Qxe5 Bd4 12.Rf1+ Nf6 13.Qh5+ Kg8 14.Qg5 h6 15.Qf4 Qe7 16.d3 Bg4 17.Nd2 Rf8 18.h3 Bh5 19.c3 g5 20.Qg3 Be5 21.Qe3 Bf4 22.Rxf4 gxf4 23.Qxa7 Qg7 24.Qf2 Nd7 25.d4 Kh7 26.e5 Rhg8 27.Kf1 Qg6 28.Kg1 f3 29.g3 Qxg3+ 30.Qxg3 Rxg3+ 31.Kf2 Rg2+ 32.Kf1 Bg6 White resigned

15.Qg5 Rg8

"Objectively" stronger (i.e. a computer thought of it) was 15...Re8 16.Qxg7+ Kd6, but it is not hard to see why RevvedUp preferred the text, even at the cost of an even game.


16.e5 h6 17.Qf4 Re8 18.exf6+ Kf7+
Black's development and relative King safety easily compensates for the lost pawn. But, give White a few more moves to get his position together, and...

19.Kd1 Bxf6 20.Nc3 Kg8

Black has castled-by-hand and retains an edge.

21.Ne4 Rf8
22.Rf3 Bd7 23.Nc5 Bc6 24.Ne6 Bxf3+ 25.gxf3 Qd6 26.Qxd6 cxd6 27.Nxf8 Rxf8

28.f4 g6 29.d3 h5 30.a4 a6 31.Ra3 Rf7 32.c4 Rd7 33.b3 d5 34.Kc2 Kf7

Again, the dynamic aspects of Black's position compensate for the pawn down. Yace Paderborn, however, nibbles away, move-by move.

35.Be3 dxc4

This gives Yace Paderborn a passer, and may not be best.

36.bxc4 Ke6 37.Rb3 Bd4

This exchange opens the floodgates, and White's game improves rapidly. Perhaps something neutral like 37...Bg7 was better.

38.Bxd4 Rxd4 39.Rb6+ Kf5 40.Rxb7 Rd6 41.Rf7+ Kg4 42.Kc3 Kh3 43.f5 gxf5 44.Rxf5 Rh6 45.Rf2 h4 46.d4 Kg4 47.c5 h3 48.d5

Black resigns

Jerome Gambit: Drilling Down (29)

RevvedUp is happy to use the opening innovation in the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) introduced by Shredder 8 in the last game (see "Jerome Gambit: Drilling down (28)") but his hopes for an early draw are dashed, nonetheless.




RevvedUp - Yace Paderbornblitz 2 12, 2006

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6


7.f4 d6 8.fxe5 dxe5 9.Qe2

9...Nf6 10.Qc4+ Kd6 11.Qd3+

This Queen check, in a position where Black's Knight was not yet developed, led to quick draws in Crafty 19.19 - RevvedUp and Hiarcs 8 - RevvedUp. Unfortunately for White, here the Knight makes a difference.

11...Kc6
Black can go this way, instead of to e2 – but even in that case, White's thematic Qg3 doesn't force a repetition of position: 11...Ke2 12.Qg3 Nxe4 13.Qxe5+ Kf7 14.Rf1+ Bf2+ 15.Rxf2+ 16.Nxf2 and after White captures the Knight at f2 he will be down only the exchange for a pawn, but Black's game will still be much better.

12.Qf3

Fritz 8 prefers the exchange of Queens, but a pawn-for-a-piece is not the ideal Jerome Gambit endgame.

12...Bg4 13.Qb3 Qd4 14.Rf1

A slip, but 14.Qe3 Nxe4 was hardly attractive.

14...Qxe4+ White resigns

Jerome Gambit: Drilling Down (20)

The following Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) game is a humorous miniature, where RevvedUp finds just the proper threat to cause Yace Paderborn to panic and yield the draw. Human totally out-foxes computer.



Yace Paderborn - RevvedUp blitz 2 12, 2006
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ng6

7.Qxc5

No "nudging" check of the King this time.

7...d6 8.Qd5+ Kf8


9.d3 Nf6 10.Qb3 b6 11.0-0 Qe7

White has reached a reasonable Jerome Gambit position where he has two pawns for his sacrificed piece. No doubt Yace Paderborn sees itself as being about a pawn behind in the game. This would hardly trouble a human gambiteer, but when the computer spots an escape from this situation – to a draw – it takes it.

Readers can decide for themselves if a draw is a positive outcome for the first player in a Jerome game – when he outranks his opponent by 1,000 points.

12.Nc3 Be6 13.Qa4 Bd7 14.Qa6 Bc8 15.Qb5 Bd7 16.Qa6 Bc8 17.Qb5 Bd7 18.Qa6 draw