Showing posts with label WeakDelfi. Show all posts
Showing posts with label WeakDelfi. Show all posts

Friday, August 4, 2017

Jerome Gambit: Creativity Abounds

It is fun to see the creativity that attackers bring to the already unusual Jerome Gambit.

Overlooked sometimes is the creativity that defenders provide, as well. There is risk involved, for sure, but imagination can sometimes bring success as well as danger.

Wall, Bill - Guest700210
PlayChess.com, 2017

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



4...Kxf7 5.Nxe5+ Nxe5 6.d4 



Alonzo Wheeler Jerome's original choice in his gambit, although he later preferred 6.Qh5+. I think the Queen move is more forceful, but also moves Black into lines that are playable, if uncomfortable. The center pawn thrust provides less guidance to the defender.

6...Bxd4 7.Qxd4 Nf3+

A very interesting way of returning the second sacrificed piece, breaking up the pawns on White's Kingside in the process. That said, it was probably not necessary to be so clever; 7...d6 was a strong alternative.

There is only one other example in The Database - a computer vs computer game.

8.gxf3 Nf6

Also: 8...Qf6 9.Qc4+ Ke7 10.Qc5+ Ke8 11.Nd2 Qd6 12.Qxd6 cxd6 13.Rg1 g6 14.b3 Nh6 15.Nc4 Nf7 16.Bb2 Rf8 17.O-O-O b5 18.Na3 b4 19.Nb5 Ba6 20.Nc7+ Ke7 21.Nxa6 Ne5 22.Nxb4 Nxf3 23.Rg2 Nh4 24.Rg4 Nf3 25.Bg7 Rfb8 26.Nd5+ Kf7 27.Bd4 Nxh2 28.Rh4 Nf3 29.Rf4+ Kg8 30.Ne7 checkmate, Delphi - WeakDelphi, Sherbrooke, 2008.

9.Nc3 Kf8 10.Bg5 Qe7



Black is in no hurry to develop his pieces, and apparently sees his King as safe. No need to create weakenesses by moving pawns!

This strategy is not going to work against a skilled Jerome Gambiteer like Bill Wall.

11.Nd5


Hitting the Queen at e7 as well as the pinned Knight at f6. If you are familiar with the Jerome Gambit you likely could find this thematic move in your sleep.

11...Qd6 12.Bf4 c5

Striking out, but overlooking that White will capture with check.

13.Bxd6+ Black resigned




Monday, January 12, 2015

A Second Chance to Decline


Here is a recent game played by Philidor 1792, from a cache of games he sent not long ago. His opponent declines the offer of a second piece with an inaccuracy that is worth knowing - and punishing. 

Philidor 1792 - Guest834593
3 0 blitz, PlayChess.com, 02.11.2014

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 




4...Kxf7 5.Nxe5+ Ke8


While declining the second piece is as old as Jerome - Brownson, Iowa, 1875 (1/2-1/2, 29), the safest place for Black's King to retreat to is f8, not e8.


6.Qh5+


It's possible that 6.Nxc6 is stronger, but who can resist checking the King?


On the other hand, White's Knight capture is tricky, as 6...bxc6? is not the correct response - see perrypawnpusher - rodrigojalpa, blitz, FICS, 2008 (1-0, 25); perrypawnpusher - zsilber, blitz, FICS, 2010 (1/2-1/2, 42); Wall,B - Qwerty, Chess.com 2010 (1-0, 9); and Wall,B - LFTN, FICS, 2012 (1-0, 20).


Neither is 6...dxc6? the right move - see Wall,B - Gebba, Chess.com 2010 (1-0, 11).


Although I have suggested the untried 6...Bf2+ in "Don't Drive Like My Brother", the best response for Black, still untried as far as The Database is concerned is 6...Qh4!?, as after 7.d4 Qxe4+ 8.Qe2 Qxe2+ 9.Kxe2 Bb6 10.Nb4 Bxd4 11.Nd5 Kd8 Black has an equal game. (Of course, he turned down a second piece to get there.)


6...g6


Silly alternatives: 6...Kf8 7.Qf7 checkmate,  perrypawnpusher - platel, blitz, FICS, 2011  and 6...Ke7 7.Qf7+ Kd6 8.Qd5+ Ke7 9.Nxc6+ Kf6 10.Qf5 checkmate, Kennedy - WeakDelphi, 2 12 blitz, 2008.


7.Nxg6 Bxf2+


Instead, 7...Qf6 was no solution in perrypawnpusher - schachix, blitz, FICS, 2013 (1-0, 10).


8.Kxf2 Qf6+


Black goes astray: 8...Nf6  was the way to keep an edge.


9.Nf4+ Kd8 10.d3 Nge7


Or 10...d6 11.Rf1 Qd4+ 12.Be3 Qf6 13.c3 Black resigned, Hultgren,R - Harrow, Campbell, CA 1960. 


11.Nc3 d6 12.Rf1 Ng6 13.Kg1




Usually it is Black who has to castle-by-hand. White is two pawns ahead, with a safer King.


13...Qd4+ 14.Kh1 Nge5 15.Nfd5 Be6 16.Be3 Black resigned




Black's Queen is trapped in the middle of the board!


Thursday, October 3, 2013

Do As I Say...


Readers are encouraged to enjoy the following quickie game, while recalling the charge: Do as I say, not as I do...

perrypawnpusher - schachix

blitz, FICS, 2013

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 




4...Kxf7 5.Nxe5+ Ke8 


When declining the Knight, usually Black's King retires to f8.


6.Qh5+


The Queen check was irresistible, but not best. I had been trying to get a Jerome Gambit all week, and this was my first opportunity.


The proper way to play this, as I should have remembered, is 6.Nxc6 when after 6...Qh4 (no examples in The Database) 7.d4 Qxe4+ 8.Qe2 Qxe2+ 9.Kxe2 Bb6 10.Nb4 Bxd4 11.Nd5 Kd8 the game would be equal.


For the record, 6.Nxc6 bxc6 was seen in Wall,B - Qwerty, Chess.com, 2010 (1-0, 9) and Wall,B - LFTN, FICS 2012 (1-0, 20) while 6...dxc6 was dispatched in Wall,B - Gebba, Chess.com, 2010 (1-0, 11).


6...g6


I had already pulled off 6...Ke7 7.Qf7+ Kd6 8.Qd5+ Ke7 9.Nxc6+ Kf6 10.Qf5 checkmate, Kennedy - WeakDelphi, blitz 2 12, 2008 and 6...Kf8 7.Qf7 checkmate, perrypawnpusher - platel, blitz, FICS, 2011 (which probably influenced my choice of 6.Qh5+). 


7.Nxg6 


7...Qf6 


Here is where my opponent lost his chance. Houdini recommends 7...Bxf2+ 8.Kxf2 Nf6 9.Qh4 Rg8 10.Rf1 Rxg6 11.Kg1 Qe7 with advantage to Black.


Only 5 games in The Database have Black's counter-sacrifice of the Bishop, and 4 of them are wins for White, for example 7...Bxf2+ 8.Kxf2 Qf6+ (8...Nf6 was correct) 9.Nf4+ Kd8 10.d3 d6 11.Rf1 Qd4+ 12.Be3 Qf6 13.c3 Black resigned, Hultgren,R - Harrow, Campbell, CA 1960.


8.Nxh8+ Kd8 9.Qxc5 Qxh8 10.Qf8 checkmate




Sunday, April 11, 2010

Bad Penny

Like the proverbial bad penny, the 5...Ke8 variation of the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) turns up here and there – most recently in two games played against Jerome Gambit Gemeinde member Bill Wall.

 Wall,B - Gebba
chess.com, 2010

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


4...Kxf7 5.Nxe5+ Ke8


There are not a lot of positive things to say about this move, except perhaps that it has confused the chess computer program Rybka (see "Rybka deals with the Jerome Gambit") and that it takes White out of "book" – even that second point is of dubious value, as "book" favors Black, and therefore he should be playing "book" moves for as long as possible.

The move 5...Ke8 was championed (unsuccessfully) by the WeakDelphi program in a match I played against it a couple years ago: see "One (or both) of us need help (Part I)" and "(Part II)".

6.Nxc6

Both Hultgren - Harrow, California, 1960 and Blackstone - Dommeyer, skittles game, California, 1960, continued: 6.Qh5+ g6 7.Nxg6 Bxf2+ 8.Kxf2 Qf6+ 9.Nf4+ Kd8 10.d3 d6 11.Rf1 Qd4+ 12.Be3 Qf6 13.c3 Black resigned. See "You, too, can add to Jerome Gambit theory!"

6...dxc6


Capturing with the d-pawn prevents White from playing d2-d4. The alternative capture was seen in Wall - Qwerty, Chess.com, 2010: 6...bxc6 7.Qh5+ g6 8.Qxc5 Ne7 9.Qc3 Black resigned

Surprisingly, best for Black, keeping White's advantage to a minimum, was 6...Qh4

7.Qh5+ Kf8 8.Qxc5+


8...Qd6 9.Qe3 Nf6


This hastens the end.

10.e5 Ng4 11.Qf4+ Black resigned







 

Friday, November 21, 2008

One (or both) of us needs help (Part II)

Clearly the computer's revenge match had gotten off on the wrong foot – see "One (or both) of us needs help (Part I)."

For game two I set its skill level to 1400, and we played from the initial Jerome Gambit position (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) again.


Kennedy - WeakDelphi (1400)
blitz 2 12 (2), 2008


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Ke8 6.Qh5+ Ke7 7.Nxc6+

We both quickly repeat our errors from the first match game – although mine are "inaccuracies" while its are "blunders."

7...Kf6 8.Qf5 checkmate

Yikes.

For our third game, I stepped the computer's skill level up another 200 points.

Kennedy - WeakDelphi (1600)
blitz 2 12 (3), 2008

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Ke8 6.Qh5+ Kf8 7.Qf7 checkmate

Not much to say about that one.

Finally, I bumped the computer's skill level up to 1800.

Kennedy - WeakDelphi (1800)
blitz 2 12 (4), 2008

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Ke8 6.Qh5+ Ke7

The move that gives Black the advantage is, of course, 6...g6.

7.Qf7+ Kd6 8.Qd5+

Missing the mate-in-one: 8.Nc4.

8...Ke7 9.Nxc6+ Kf6

One last gift.

10.Qf5 checkmate



No more experiments for me – for a while, anyhow.


graphic by Jeff Bucchino, "The Wizard of Draws"


Thursday, November 20, 2008

One (or both) of us needs help (Part I)

After my computer vs computer Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) match debacle (see "I can't seem to get the hang of these things") I was sure that I had done something wrong.

Eventually I discovered that the skill setting for WeakDelfi was set at 1200 – could that have been responsible for the engine's odd play?

Having injured the honor of the electronic beast, I figured that it would only be fair for me to allow it some form of revenge – across-the-board.

So I set up a blitz game (2 12) to start after move 4 of the Jerome Gambit. I set my opponent's skill level at 1200.

Kennedy - WeakDelfi (1200)
blitz 2 12 (1), 2008

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Ke8


Just. Plain. Bad.

6.Qh5+

I knew that this was not the best move, but I wanted to see how my opponent would handle it.

White would have a tiny advantage after 6.Nxc6 Qh4 7.d4 Qxe4+ 8.Qe2 Qxe2 9.Kxe2 Bb6 10.Nb4 Bxd4.

6...Ke7 7.Nxc6+

Missing: 7.Qf7+ Kd6 8.Nc4 checkmate.

7...Ke6

Clueless.

8.Qf5+ Kd6 9.Qd5 checkmate



Ouch!

graphic by Jeff Bucchino, "The Wizard of Draws"

Tuesday, November 18, 2008

I can't seem to get the hang of these things...

After a few unfruitful days of trying to coax a Jerome Gambit game (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) out of a lucky opponent at the Free Internet Chess Server (FICS) I decided to put together another Computer vs Computer Jerome Gambit match.

Despite feeling a bit like Jar Jar Binks trying to command the Death Star, I turned to my new Deep Rybka 3.0 Aquarium, and discovered two interesting engines: Delfi (reportedly rated 2500) and WeakDelfi (supposedly rated 1900).

Perfect!

I arranged for a 20-game match (5 minutes per side per game), with the stronger Delfi playing the White pieces each time, starting from the Jerome Gambit position after four moves.

Delfi - WeakDelfi
5 minute game
1st of 20 game match

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Nxe5 6.d4

6...Bxd4 7.Qxd4 Nf3+


Huh???

What is this??
8.gxf3 Qf6 9.Qc4+ Ke7 10.Qc5+ Ke8 11.Nd2 Qd6 12.Qxd6 cxd6

13.Rg1 g6 14.b3 Nh6 15.Nc4 Nf7 16.Bb2 Rf8 17.0-0-0
This is not the kind of position that usually comes to mind when someone says "Jerome Gambit".

17...b5 18.Na3 b4 19.Nb5 Ba6


More strangeness.
20.Nc7+ Ke7 21.Nxa6 Ne5 22.Nxb4 Nxf3 23.Rg2 Nh4 24.Rg4 Nf3 25.Bg7 Rfb8 26.Nd5 Kf7
27.Bd4 Nxh2 28.Rh4 Nf3 29.Rf4+ Kg8 30.Ne7 checkmate



Nervously, I looked at the second game in the match.


Delfi - WeakDelfi
5 minute game
#2 of 20 game match

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+
Black lost on time.


What???

Unreal!

For the record, the next 8 games looked like this:
Delfi - WeakDelfi
5 minute game
#3 of 20 game match


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.

Delfi - WeakDelfi
5 minute game
#4 of 20 game match


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Delfi - WeakDelfi
5 minute game
#5 of 20 game match

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Delfi - WeakDelfi
5 minute game
#6 of 20 game match

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.

Delfi - WeakDelfi
5 minute game
#7 of 20 game match

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Delfi - WeakDelfi
5 minute game
#8 of 20 game match


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Delfi - WeakDelfi
5 minute game
#9 of 20 game match


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Delfi - WeakDelfi
5 minute game
#10 of 20 game match


1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Nxe5+ Black lost on time.


Nine straight losses, all on time!

I stopped the match. I didn't have to be a Jedi master to know how the remaining 10 games would turn out.

graphic by Jeff Bucchino, "The Wizard of Draws"