Friday, June 23, 2017

Jerome Gambit: I Am Glad That I Read This Blog

I know that I have said before that I am glad that I read this blog, but my most recent Jerome Gambit game reinforced this habit - on the day the previous post appeared, I played the following game. Using "The Machine Idea", I quickly developed an advantage. Despite my opponent's efforts at counter-attack, and the time ticking off my clock, I was able to construct a checkmate.

perrypawnpusher - Praotorian

5 5 blitz, FICS, 2017

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 

7.Qf5+ Kd6 8.f4 Bd4 

An idea favored by some chess computer programs, looked at in Petasluk - GriffyJr, blitz, FICS, 2017, (0-1, 30).

9.fxe5+ Bxe5 

Instead of this capture, Stockfish 8 recommends the following line, which takes the game in a very different direction, but which winds up with a small advantage for Black: 9... Kc6 10.c3 d6 11.e6 Ne7 12.Qf1 Rf8 13.Qc4+ Bc5 14.a4 a6 15.d4 b5 16.Qe2 Ba7 17.axb5+ axb5 18.d5+ Kb7 19.Qxb5+ Bb6 20.Ra3 Rxa3 21.Nxa3 Ka7 22.Qa4+ Ba6 23.Nc2 Qe8 24.Qxe8 Rxe8. White has three pawns for the sacrificed piece, but Black has the two Bishops.

Analysis Diagram


I remembered GriffyJr's improvement.


A blitz move. Black's best was the counter-attack with 10...Qh4+.

11.Qd5+ Ke7 12.Qxd4 Qe8 13.Bg5+ Kf8 

Material is even, but White's attack is deadly. Stockfish 8 comlained after the game that 13...Kf7 would have held out longer, but I still would have had a significant advantage.

14.O-O+ Nf6 15.Bxf6 gxf6 16.Rxf6+ 

Good enough to win, but a post mortem suggested 16.Qxf6+ Kg8 17.Qg5+ Qg6 18.Qe7 Qe8 19.Qxe8+ Kg7 20.Qe5+ Kh6 21.Rf6+ Kg7 22.Qg5 checkmate. This is a good maneuver to remember - even in time pressure. 

16...Kg8 17.Qd5+ Kg7 18.Qg5+ Qg6 19.Rxg6+ hxg6

 White has a Queen and a couple of pawns for a Rook - if he can manage his clock. Unfortunately, although my opponent's time was moving quickly, mine was falling even faster. My opponent was aware of this, and continued to fight.

20.Qe5+ Kg8 21.Nc3 d6 22.Qf6 Rh7 23.Rf1 Bd7 

Heh. In the Jerome Gambit I sacrifice two pieces and challenge my opponent: show me your win. Here Praotorian throws the challenge back at me.

24.Qxg6+ Rg7 25.Qf6 Kh7 26.Rf4 d5 27.Rh4+ Kg8 28.Nxd5 Rf8 

Everything is fine, but tick, tick, tick...

29.Qc3 Bb5 30.Ne3 Be2 31.Nf5 Rgf7 32.Qh8 checkmate

Wednesday, June 21, 2017

Jerome Gambit: A Machine Idea

Besides being used to annotate Jerome Gambit games of interest, computer programs have served as proponents or opponents in Jerome and Jerome-related games. The program below, GriffyJr, has visited this blog on several occasions - for starters, check out "Bots on Our Side" Part 1Part 2  and Part 3 as well as "Ionman vs the Bots".

In today's game we examine the most recent example of a computer - generated move. There is still a lot of game to play afterward, however.

Petasluk - GriffyJr
5 0 blitz, FICS, 2017

 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6 7.f4 Bd4 

An interesting and somewhat unusual idea. The earliest example of it in The Database was played in 2002 by the computer program BigBook at the online site FICS.


Instead, 8.c3 was seen in the oldest and most recent games with the line in The Database: 8...Nd3+ 9.Kd1 (9.Kf1 Nxc1 10.cxd4 a6 11.Qe5+ Kf7 12.Nc3 Nd3 13.Qf5+ Qf6 14.Qxf6+ Nxf6 15.e5 Ne8 16.f5 Nxb2 17.Rb1 Nd3 18.g3 a5 19.a3 b6 20.Ke2 Ba6 21.Ke3 Bc4 22.Nb5 a4 23.Rhc1 Nxc1 24.Rxc1 Bxb5 25.h4 c6 26.g4 d6 27.g5 dxe5 28.dxe5 c5 29.d4 cxd4+ 30.Kxd4 Be2 31.e6+ Ke7 32.Rc6 b5 33.Rb6 Nd6 34.Rc6 Nxf5+ 35.Ke5 Nxh4 36.Rc7+ Kf8 37.e7+ Ke8 38.Ke6 Ng6 39.Rc2 Bf1 40.Rf2 Bd3 White forfeited on time, megagurka - BigBook, FICS, 2002) 9...Nf2+ 10.Ke2 Nf6 11.Qf5+ Kf7 12.cxd4 Nxh1 13.d3 d5 14.e5 Bxf5 White resigned, Petasluk - GriffyJr, FICS, 2017. 

And there was also another computer-with-black game: 8.f5+ Kd6 9.d3 g6 10.Qe2 gxf5 11.c3 Qh4+ 12.g3 Bxc3+ 13.bxc3 Qg4 14.d4 Nf3+ 15.Kf1 Qh3+ 16.Kf2 Nxh2 17.Bf4+ Ke7 18.exf5+ Kf8 19.Nd2 Nh6 20.Bxh6+ Qxh6 21.Kg2 Qg5 22.Rxh2 Qxf5 23.Rf1 d5 24.Rxf5+ Bxf5 25.Qe5 Kf7 26.Rh5 Bd7 27.Qxd5+ Kg6 28.Ne4 Rae8 29.Qg5+ Kf7 30.Qf6+ Kg8 31.Rg5 checkmate, Moller,M - Mephisto, Denmark 2008.

Interestingly, Stockfish 8 suggests 8.fxe5 g6 9.Qg4+ Kf7 10.Qf4+ Kg7 11.c3 Bb6 12.a4 a5 13.d4 d6 14.O-O Qe7 15.exd6 cxd6 16.Na3 Be6 17.Kh1 h6 18.d5 Bd7 19.Nc4 Bc5 20.e5 Rf8 21.Qxf8+ Qxf8 22.Rxf8 Kxf8 23.Bf4 Ne7 with an even game because White's pawns are balancing out Black's extra piece. 


A clear improvement over 9.c3 Nd3+ 10.Ke2 Ne7 11.e5+ Nxe5 12.fxe5+ Bxe5 13.Qd3+ Ke6 14.Qc4+ d5 15.Qg4+ Kd6 16.d4 Bxg4+ White resigned, fehim - blik, FICS, 2006. (Yes, blik is a computer.)


If it can't see a reason not to, a computer will grab material. Here GriffyJr shows some nearsightedness. 



Interestingly, two earlier several-days-per move games (all players human) missed the idea:

10.O-O Qh4 11.h3 Qg3 12.Rf2 Nf6 13.d4 Bxd4 14.Bf4+ Kc6 15.Bxg3 Bxf2+ 16.Bxf2 d6 17.Qa5 Nxe4 18.Qa4+ Kd5 19.Nc3+ Nxc3 20.bxc3 Ke6 21.Re1+ Kf6 22.Qf4+ Kg6 23.Re3 Bf5 24.Rg3+ Kf6 25.Bd4+ Ke6 26.Re3+ Kd7 27.Qxf5+ Kd8 28.Bxg7 Rg8 29.Bf6 checkmate, blackburne - eddie43, Jerome Gambit thematic,, 2008; and

10.c3 Nh6 11.Qf3 c5 12.Qd3+ Kc7 13.Na3 a6 14.Nc4 d6 15.Rb1 Qh4+ 16.g3 Qh3 17.Nxe5 dxe5 18.Qe3 b6 19.b4 Rf8 20.bxc5 b5 21.Ba3 Ng4 22.Qg5 Rf7 23.Qh4 Qg2 24.Qxg4 Bxg4 White resigned, Gary_Seven - drewbear, JG3 thematic, 2008


GriffyJr decides to mix it up.

11.Kf1 Qf6 

Yikes. Instead, GriffyJr gets mixed up. I have no idea how or why. Much better was 11...Kc6.

12.dxe5+ Qxe5 13.Qxe5+ 

Oh, dear. The crusher was, of course, 13.Bf4 winning Black's Queen. These things happen in blitz games.


Even game.

14.Nc3 Nf6 15.g3 Nxe4 16.Bf4+ Kf5 17.Nxe4 Kxe4 18.Re1+ Kf5 19.Kg2 b6 20.Rhf1 Bb7+ 21.Kh3 Ba6 22.Rf2 c6 

Play continues in a Queenless middlegame, about balanced, despite White's pawn minus (because of his activity).

23.Be5+ Kg6 24.Rd2 d5 25.Rd4 Bc8+ 26.Kg2 Bf5 27.h3 Rhe8 

By focusing on development Black has pulled ahead. Still, if White can exchange Rooks, the possibility of a drawn bishops-of-opposite-color endgames is there.

Unfortunately, the computer can move lightning fast, while the human actually has to think - a disadvantage in blitz. White makes a tactical slip.

28.g4 Bxc2 29.h4 Be4+ 30.Kg3 Rxe5 White resigned

Monday, June 19, 2017

BSJG: Chance for A Miniature

Why play the Blackburne Shilling Jerome Gambit, when there are perfectly playable responses for White within the regular lines of the Blackburne Shilling Gambit? Fun and familiarity are two reasons. The chance for a miniature is another. 

DVYate - melazzini
FICS, 2017

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4 

The Blackburne Shilling Gambit.

4. Bxf7+ 

The Blackburne Shilling Jerome Gambit.

(Certainly White can play 4.0-0, 4.Nxd4 or 4.c3 instead, with advantage.)

4...Kxf7 5. Nxe5+ Ke8 

The Database has 2,256 games with this move. White scores 58%.

"Best" seems to be 5...Ke6.

6.Qh5+ g6 

Likewise, The Database has 1,356 games with this move. White still scores 58%.

7. Nxg6 Bg7 

This Bishop moves seems, at first glance, to be a practical response - arranging to capture White's Knight after it takes the Rook at h8.

There are three things wrong with this move, however: the game continuation, the recommendation in the notes, and the straight-forward capture 7...hxg6 (best).


At the very least White is now going to wind up ahead a Rook and 4 pawns. That is more than enough.

However, in all fairness, he also had the King hunt 8.Ne5+ Ke7 9.Qf7+ Kd6 10.Nc4+ Kc5 11.Qd5+ Kb4 12.a3+ Ka4 13.Nc3 checkmate. 


Holding out longer is 8...Ke7, but why bother? 

9.Qf7 checkmate