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Iolo Ceredig Jones vs Juergen Dueball
Olympiad Final-A (1974)  ·  King's Indian Defense: Fianchetto Variation. Classical Fianchetto (E67)  ·  0-1
To move:
Last move:

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sac: 26...Re1 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Nov-18-11  gofer: A nice interference move...

<26 ... Re1>

27 Rxe1 Nf7+ winning the queen and more
27 Qxe1 Nxe1 winning the queen and more
28 Nxe1 Nb2 winning the queen and more
28 Bxe1 Nb2 winning the queen and more

So what's black's best option?

<27 Qxe1 Nxe1>
<28 Rxe1 Qd3>

Black is slaughtering white... Time to check.

Premium Chessgames Member
  TheBish: I Jones vs J Dueball, 1974

Black to play (26...?) "Difficult"

Two things I noticed within the first 30 seconds of analyzing: (1) The ♖f1 is the only thing stopping ...♘f2+, forking king and queen; (2) The Black Queen is indirectly attacking the ♖f1. Looking for a "brute force" move to change the situation, possibly to affect the above listed elements -- I found it!


This must have come as a shocker (assuming that I'm correct), but it works for two reasons: (1) 27. ♖xe1 allows the knight fork we were looking for, and (2) 27. ♗xe1 or 27. ♘xe1 interferes with the White queen's protection of the ♖f1.

27. ♕xe1

I believe this is as good as anything. The alternatives: (A) 27. ♗xe1 ♘b2! 28. ♗b4 ♘xd1 29. ♖xd1 ♕e2 30. ♖c1 ♕xf3+ 31. ♔g1 ♗h6 with a winning advantage; (B) 27. ♘xe1 ♘b2! 28. ♘g2 (what else?) ♘xd1 29. ♖xd1 ♕e2, winning another piece.

27...♘xe1 28. ♖xe1 ♕d3, winning another piece.

OK, I need to correct my comment about this line being about as good as anything. Line (A) is slightly better, but Black wins regardless, so it's a moot point.

Nov-18-11  polarx: Got it! Would I overlook this move in actual play? I would.
Nov-18-11  abuzic: The puzzle 26...?
27.Rxe1 <27.Bxe1 Nb2 and black wins the Q or mates> 27...Nf2+
28.Kg2 Nxd1.

Earlier moves:
<26...Nd7? 27.Nc2??>

Black had chance to keep his game with 27....Bc3.

White had instead of <26...Nd7?> the winnig 26...Ng4!:

-if 27.fxg4 Bxd4 black at least wins the exchange after the following ...Nf2+.

-if 27.Kg2 Bxd4
28.fxg4 Re2+
29.Kh3 <29.Qxe2 Nf4+ 30.Rxf4 Qxe2+>

30.Rxf2 Rxf2.

-if 27.Qa1 Bxd4
28.Qxd4 Nf4!
29.Qg1 <29.Kg1 Qe2>

29... Nh3
30.Qg2 Re2 black clearly wins

Nov-18-11  abuzic: <abuzic: The puzzle 26...?

Earlier moves:
<26...Nd7? 27.Nc2??>>

Must correct move numbers:

Earlier moves:
<25...Nd7? 26.Nc2??>

White had chance to keep his game with 26.Bc3.

Black had instead of <25...Nd7?> the winnig 25...Ng4!:

-if 26.fxg4 Bxd4 black at least wins the exchange after the following ...Nf2+.

-if 26.Kg2 Bxd4
27.fxg4 Re2+
28.Kh3 <28.Qxe2 Nf4+ 29.Rxf4 Qxe2+>

29.Rxf2 Rxf2.

-if 26.Qa1 Bxd4
27.Qxd4 Nf4!
28.Qg1 <28.Kg1 Ne2+; 28.Rg1 Qe2>

28... Nh3
29.Qg2 <29.Nc5 Qe2 30.Qg2 Ngf2+ 31.Rxf2 Nxf2+ 32.Kg1 Qd1+ 33.Qf1 Nh3+ 34.Kg2 Re2+ 35.Qxe2 Qxe2+>

29...Re2 black clearly wins

Premium Chessgames Member
  Gilmoy: <22..Qa6 24..Nd3> nicely illustrates the intermediate principle that the strength of your position is proportional to the number of <intersection of lines of force>, not merely material point count. Black plants a forward N for later mayhem (at f2 :), evoking R Byrne vs Fischer, 1963 <10.Ba6 14.Nd3>.

Sinatra: "due be due ball do"

Nov-18-11  sevenseaman: <Gilmoy> <<22..Qa6 24..Nd3> nicely illustrates the <intermediate principle that the strength of your position is proportional to the number of <intersection of lines of force>>>

<intersections of lines of force>? Say b5-f1 is one of the lines of force of the Black Q. What all does it do and which other friendly lines of force does it intersect? How do we use these intersections?

Could you please be more lucid, more scrutable, illustrating your point with a couple of examples, possibly less cluttered.

Nov-18-11  Patriot: I couldn't find anything here in a reasonable time so I didn't get this. In fact I first thought it was white to play and concluded black wasn't really threatening anything!

This amazes me. The rook can be captured 4 ways (!) and all of them are losing! At a glance 26...Re1 doesn't look safe at all so I dismissed it.

Nov-18-11  LIFE Master AJ: I got this right away ... virtually instantly. (26...R-K8!! / 26...Re8!!)

This leads me to believe that I must have seen this game before, so ...

I go to my library, I have both the hard-back and soft-cover book on this event, there is a bookmark in the book, on page # 61. Apparently, I was studying Jones-Portisch the last time I picked this book up ... which must have been at least a few years ago ... usually, I can remember what I was doing when studying chess, however, I don't recall this at all.

The book is: "The 1974 World Chess Olympiad," (in Nice, France) by Raymond Keene and David Levy. [(c) 1975 / ISBN: #0-89058-205 / ICCN: 74-29705]; Game # 97, page # 136. (I even have a page of hand-written notes from the 1970's that we made at chess club on this game, this is in my soft-cover book - which is pretty badly marked up.) BTW, Keene has several nice games in this book, I did not check, but I am sure they must be on this website.

Today, the Pensacola Chess Club meets at the "Book-A-Million," on N. Davis Hwy. Back then, we met at PJC or Baptist Hospital.

I am pretty sure that this book is out of print, but (in my mind); its one of the best books ever made on ANY Olympiad ... they don't do this kind of quality stuff anymore. Here is a link, in case you actually would like to try and find a copy of this book - "Abe's Book's" is usually pretty good. (

Nov-18-11  CHESSTTCAMPS: Material is even, with black having the more active pieces and control of the open e-file. The white rook is the only defender preventing a royal fork at f2, suggesting a move that might divert the rook.

26... Re1!! places the rook on the square that seems to be the best defended in white territory, winning decisive material.

A) 27.Rxe1 Nf2+ 28.Kg1 Nxd1 29.Rxd1 Qe2 30.Ne3 e4 wins.

B) 27.Qxe1 Nxe1 28.Rxe1 Qd3 29.Re8+ Bf8 30.Bb4 Qxc2 is similarly unpalatable.

C) 27.Bxe1 Nb2! (the key point, exploiting the interference by double attacking d1/f1) 28.Bb4 Nxd1 29.Rxd1 Qe2 30.Rc1 Qxf3+ 31.Kg1 d4 should not last long.

C.1) 28.Nxb2 (and many other moves) Qxf1#

C.2) 28.(other) Nxd1 with a winning advantage.

D) 27.Nxe1 Nb2! 28.Nc2 Nxd1 29.Rxd1 Qe2 transposes to A.

D.1) 28.Nxb2 (and many other moves) Qxf1#

D.2) 28.(other) Nxd1 with a winning advantage.

Time for review....

Premium Chessgames Member
  Gilmoy: <sevenseaman: Say b5-f1 is one of the lines of force of the Black Q. What all does it do and which other friendly lines of force does it intersect?>

It depends where your other pieces are. (Really, that's the point.) It's a way to think holistically, to maximize the benefit of teamwork between 2+ pieces.

"Lines of force" is simply the reachable squares of each of your pieces. Where two lines intersect, that means either of your pieces would be protected by the other one if you moved it there. That, in turn, gives you mobility to advance a plan, or shop for tactics that are nastier than your opponent's.

He who gets forward first often gets an advantage in space or initiative. In the newbie form, chess has many 1-piece maxims like <rusty nail in the kNe6> or <rook on the 7th>, or conversely <best defender of a castled K>. At intermediate levels, we decompose those advantages into multi-move plans that can force them on an unwilling opponent. "Intersections" are a key mechanism, because they can build toward winning the tempo to get the first piece that deep.

Learning the game 1 piece at a time, we quickly grasp the idea: <put it on its strongest square>, which generally means controlling the most squares: R on (half-)open file, Bs on long diagonals or pinning f7/f2, Ns not-rimward. To improve, we progress to thinking multiple pieces at a time, and go for positions with criss-crosses.

The strongest "criss-cross" is 2 line movers on the same line: we call that a "battery", and it's well-known as "when in doubt, double your rooks", or Q-B vs Dragon-like anything. Later, we grok that it would be more of a (mating) threat to have the Q in front, ergo it can be wise to invest a move to get your Bs behind -- which becomes the <GM bishop thing>, e.g. Bd3-Bb1.

The epitome of this idea, and very rare OTB, is the battery fork, or "double-double":

- A. (0.5 stars) Half-Star Bob has two en prise, Alice's Q forks them.

- B. (1.0 star) One-Star Bob has 2 pieces, both 1-defended. Alice is painting them with 1 dot (of control/attack) each. It's a wash.

- E. (5.5 stars) Alice moves her Q onto <both lines> simultaneously. Now she has 2 dots on each, and that's the same fork. It's much harder to pull off, since it presumes both a rook lift <and> a bishop thing, and that those were the two best (or at least very good) single-piece moves at those times.

Rubinstein vs Hromadka, 1923
Ivanchuk vs Vallejo-Pons, 2011

It follows that the weakest criss-cross (that you can still plan for) is B+N, since they intersect in at most 2 squares, and only every other N move. (N+N is even rarer, so you basically cannot plan to achieve it -- although Gerard Welling tries with his goofball Nf3-Nd2-Nf1-Ne3 for a double-Nd5 :) But because of that, B+N coordination becomes critically important in all openings, and separates the noobs from the tyros.

Working backward, this drives a great deal of opening theory, esp. Nc3-Bg2-Nd5, Colle System's overprotect-and-erupt on e4, Nimzo-Indian Nf6-Bb4-Ne4 to not let White do what he wants to do, Shirov's wacky g4 "sac" vs Sicilian K-side castling (and why nobody ever takes that pawn), and Nimzo-Larsen Attack 1.b3 promising a heavy dogpile on g7. All of these exploit criss-crosses to control (or blow up) the center, sometimes with an eye toward midgame attack potential.

Then since everybody just memorizes openings, good players further stratify by finding midgame repostings of B+N. Carlsen strikes me as particularly obnoxious at this (or maybe it's just book in his English/QID lines :) Fischer's <10..Ba6 14..Nd3> is a prime example: as a bottleneck, it thoroughly stymies White's Q, winning a tempo to play a precisely-calculated line. (In other words, he didn't do it just to do it, since objectively he's losing B+N for R -- but it gave him a springboard for tactics, and he saw it all the way to a winning attack.)

<How do we use these intersections?> Generally, you plant a piece where your opponent can't take it (yet). Then your piece sits in his backfield and hurts something for 1 tempo, and as he puts out fire on board, board burns faster.

Mnemonic: Every protected piece was an intersection before it got there!

Premium Chessgames Member
  kevin86: 26...♖e1!!! compares with the Morphy and Marshall "nest of pieces" moves.
Premium Chessgames Member
  Jimfromprovidence: White has no counterattack after the text 29...Qe2, not even with 30 Re1.

click for larger view

The back rank is protected twice so there's no threat there. Now white simply plays 30...Qxf3+, forcing 30...Kg1 31 Bxc3, picking up another piece.

click for larger view

Nov-18-11  vrandolph: Couldn't believe I figured this one out fairly quickly. I've missed all but Monday's puzzle so far, this week.
Nov-18-11  tacticalmonster: 28 Re1! 29 Bxd2 (29 Rxe1 Nf2+) Nb2!- White must lose his queen or get mated.

Time spent: 30sec

Premium Chessgames Member
  chrisowen: The whippletree Re1 lambast i on good hop piece tacks not it rook over then nf2 forking queen a gul has current eaves drop bishop orthodox mop top roll share nb2 picks up her monach scope reduced ;0

The swingletree d3 roundabout it equalizer d5 then dark horse harries on dive Jones and JD ok! Old DJ sardines.

Nov-18-11  sfm: <polarx: Got it! Would I overlook this move in actual play? I would.> Same here. I just wonder how many combies I have missed over time.
Nov-18-11  anandrulez: So would I ! These are easy to pick when its a puzzle but otherwise you wont get such ideas from vaccum .
Nov-18-11  BOSTER: <Gllmoy> <intermediate priciple that the strength of your position is proportional to the number of intersection of lines of force>. It would be nice if you give any source, supporting this theory.
Nov-18-11  M.Hassan: "Difficult" Black to play 26....?
Black has a bishop for a Knight which makes sides equal.

I saw the move that i think is right fairly quickly:

<if 27.Rxe1 Nf2 forking King and Queen>

if either Bisop or Knight take the Rook, say Bishop 27.Bxe1 Nb2 attaking Queen and opening way for Queen to checkmat as can be seen from the diagram below: 28.Nxb2 Qxf1#

May be the best play would have been to take the Rook with Queen:

27.Qxe8 Nxe8
In this way, White Looses Queen for a Rook and a Knight. Time to check

click for larger view

Nov-18-11  Sularus: got it
Premium Chessgames Member
  FSR: The outrageous 26...Re1!! wins queen for rook and knight. If White captures the rook with his knight or bishop, 27...Nb2! wins. If 27.Rxe1, Nf2+ 28.Kg2 Nxd1.
Premium Chessgames Member
  FSR: I've heard that the 1974 Olympiad was very Nice.
Aug-08-15  thegoodanarchist: Almost certain this culminating combination is in The Encyclopedia of Chess Middlegames.

Also known as Encyclopedie des Milieux du jeu d'Echecs.

Or Enciclopedia del Medio juego de Ajedrez.

Others have called it enciklopedija šahovskih središnica. (One of my favorites)

You would not be out of line to refer to is as
enciclopedia scacchistica del mediogioco.

Still, I would be remiss not to point out that it could be called encyklopedi över mittspelet i schack.

The attentive reader might be thinking, "What about
enzyklopädie des schachmittelspiels?"

Well played, sir! Well played.

Premium Chessgames Member
  perfidious: <FSR> To coin a phrase.
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