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Aly Yasseen vs Eric Lobron
Dubai (1983)
Modern Defense: King Pawn Fianchetto (B06)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Jun-28-13
Premium Chessgames Member
  Phony Benoni: I've seen the Bh6 idea in situations like this, with the Qh8# follow-up whether or not the bishop is taken. To make that work the ♘g5 has to go, but 18.Ne6+ Qxe6 obviously goes nowhere.

Maybe distract the queen first with 18.Nc7 Qxc7 19.Ne6+? No, the king gets a flight square via e8 and d7; the queen needs to stay where she is.

So maybe 18.Nxf7 instead? 18...Nxf7 19.Bh6, with a double pin mate. 19...Ke8 20.Qg8+ is no help. And declining the knight allows grievous discovered checks.

As usual, I didn't look deeply enough at Black's serious defenses like 18...Nf3+. Had it been a game, I would have looked harder, but in a puzzle--and especially by Friday--I'm satisfied with spotting the main idea.

Jun-28-13  LoveThatJoker: <18. Nf7 Nxf7>

(18...Ke8 19. Qg8+ Bf8 20. Nxe5 ; 18...Ng6 19. Ne5+ )

<19. Bh6!> 1-0

LTJ

Jun-28-13  Bartimaeus: White has sacrificed quite some material early in the middlegame to get a promising position. The king is uncomfortably placed in the firing line of the powerful rook on the f-file not to mention the Queen and Knight ominously close by.

To start with there seem two promising candidates : Rxf7+ and Nxf7. An additional advantage of Nxf7 is that Bh6 can be played soon enough which strengthens the attack and brings the other Rook into play. All in all Nxf7 sees the strongest move to start with.

However, black has variety of responses at his disposal. Evaluating them we have :

A) 18. Nxf7 Nxf7 19. Bh6 Qe6 (Bxh6 Qh8#) 20. Bxg7+ Ke8 21. Nc7+ winning the Queen and the game

B) 18. Nxf7 Nxf3+ 19. gxf3 (better than Rxf3) Qf5 20. Qxf5 Bxf5 21. Nxd8 Rxd8 22. fxe4 and white is a full rook ahead and will win

C) 18. Nxf7 Qxb5 19. Nxd8+ Ke8 20. Qxg7 Nd3 21. Bg5 Nd5 22. Qg8+ Kd7 23. Qxd5+ and is a full rook ahead with possible mate soon

Overall, black seems lost in all lines. Looking at the game line, seems like black went with a variant of line B) though it didn't make any difference to the eventual outcome.

Jun-28-13  Bartimaeus: Correction in line A)

18. Nxf7 Nxf7 19. Bh6 Qe6 20. Qh8# instead of the above

Jun-28-13
Premium Chessgames Member
  Jausch46: Phony Benoni, I have found Nc7 also the first and most promising move. Then there is no mate, but the loss of the black Queen can not be avoided. However, the outcome on the Nxf7 line resulted in the same, except that there emerged a lot of risk where also White could go astray. Let' ponder on this a little.
Jun-28-13
Premium Chessgames Member
  agb2002: White is one bishop and one pawn down.

Black threatens 18... Qxb5.

The first idea that comes to mind is 18.Nxf7:

A) 18... Nxf7 19.Bh6 (threatens Qh8#; 19.Qg6 (19.Qh5 Qd5) 19... Qe6 20.Qh5 Qd5 and White doesn't seem to achieve anything)

A.1) 19... Bxh6 20.Qxf7#.

A.2) 19... Qxb5 (or Qg4) 20.Qh8#.

A.3) 19... Ke8 20.Qg8+ Bf8 21.Qxf8#.

A.4) 19... e6(5) 20.Qxg7+ Ke8 (20... Ke7 21.Qxf7#) 21.Qg8+ Ke7 22.Qxf7#.

A.5) 19... Qf5 20.Rxf5 Bxf5 21.Qxg7+ is a massacre.

B) 18... Qxb5 19.Nd6+ Nf3+ (19... Bf6 20.Bh6#) 20.Rxf3+ exf3 21.Nxb5 + - [Q vs R+B].

C) 18... Nf3+ 19.Rxf3 exf3 20.Bh6

C.1) 20... Kxf7 21.Qxg7+ Ke6 22.Qg6+ Ke5 (22... Kd5 23.Rd1+ Ke5 (23... Kc4 24.Na3#) 24.Re1+ Kd5 25.Qe4#) 23.Re1+ Kd5 24.Qe4#.

C.2) 20... Bxh6 21.Nxh6 e5(6) (21... Qe6 22.Qh8+ Qg8 23.Qxg8#) 22.Qg8+ Ke7 23.Qf7#.

C.3) 20... Qg4 21.g3 Kxf7 looks bad for White.

D) 18... Nf3+ 19.gxf3

D.1) 19... Kxf7 20.fxe4+ and mate next.

D.2) 19... Qxb5 20.fxe4 with many threats (Nd6+, Nxd8+, Ne5+, Bh6). For example, 20... Ke8 21.Qg8+ Bf8 22.Ne5.

Jun-28-13  patcheck: Black is a bishop and a pawn up. Only seems possible : 18. Nxf7

A) 18. … Nxf7 19.Bh6
A1) 19. … Bxh6 20. Qxf7#
A2) 19. … Ke8 20. Qg8+ Bf8 21. Qxf8#
A3) 19. … Queen move 20. Qh8#
A4) 19. … e6 20. Qxg7+ Ke7 (20. … Ke8 21. Qf7#) 21. Rxf7+ and wins the queen and the game.

So : A) 18. … Nxf7 doesn’t seem to be a good defense.

B) 18. … Ke8 19. Qg8 Bg8 20.Nxe5 and black looses:20. … Qf5 (only defense against mate) 21.Nc7#

C) 18. … Qf5 19. Nxd8 Qxf1+ 20. Kxf1 Bg4 21. Bh6 and white wins (21. … Bxh6 22. Qh8# / 21. … Rxd8 22. Qxg7 Ke8 23. Qxe5 and white wins)

D) 18 … Qe1 19. Bh6 (not 19. Qxe1 Rxe1+ 20. Kf2 Ng4+ 21. Kg3 Re3+ 21. Kh4 Kxf7 and things are unclear) and black is lost :

D1) 19. … Qxa1 20. Qh8#
D2) 19. … Bxh6 20. Qh8#
D3) 19. … Nxf7 20. Qh8#
D4) 19. … e6 20. Nxe5+
D5) 19. … Ke8 20. Qg8+ Ke7 (20. … Bf8 21. Qxf8, etc.) Qxd8+

E) 18. … Nf3+, probably the best defense, 19. gxf3 and material is for the moment almost equal.

E1) 19. … Kxf7? 20. fxe4+ and black is lost (20. … Ke6 21. Qf5# / 20. … Ke8 21. Qh8+ Bg8 21. Qxg8# / 20. … Qf5 21. exf5+ and white wins easily)

E2) 19. … Qf5 20. Qxf5 Bxf5 21. Nxd8 Rxd8 22. fxe4 and black will have won the quality.

Nevertheless, it is not already a clear win so they may have a better solution

Jun-28-13  patcheck: I have to correct my last statement : the E2 line I mentioned wins clearly, as Bartimaeus said. I just hadn't realize that white is then a full rook ahead.
Jun-28-13  newzild: I went for 17. Bf4, threatening 18. Bxe5 followed by mate. However, Black can reply 17...Nf3+! as in the game, restricting White to a small advantage.

In the game, better than 19...exf3 is 19...e3!, keeping the f-filed closed. Then after 20. Nxd8 Nc4! (defering the capture of the knight to defend the e3 pawn) it's a real mess. White is probably winning, but it's beyond my powers to analyse any deeper.

So, for the second time this week I've missed a solution. Normally I can solve Monday-Friday puzzles without too many problems.

Jun-28-13
Premium Chessgames Member
  whiteshark: I was thinking of <18.Rxf7+ Nxf7 19.Qg6>, but of course it didn't work.
Jun-28-13  Dr. Funkenstein: White to play down a bishop and a pawn…maybe as a result of a Bxh7+ sac… Black’s king is a bit exposed, but seems to be covered. The b5 knight is hanging, but at the moment that would take away the queen from the defense of the king.

My first thought was Bf4 to try to win a piece back and put more pressure on f7

18. Bf4

18. …f6 19. Bxe5 Nd5 (to prevent Nc7) 20. Rad1 looks threatening and I like white here with the threat of Nc7 and Nce6+, but I don’t see anything decisive…

18. …Nd5 19. Bxe5 Nf6 looks ok for black with the queen and b5 knight attacked

Hmm maybe we need something more drastic… This is a puzzle after all…

18. Nxf7 with the threat of Nfd6+ leading to mate or a discovered check on e5/g5/d6 that wins the black queen so I think the knight must be taken

18. …Nxf7 19. Bh6 and I don’t know how black avoids mate as white is threatening Qh8# so black can’t play queen move like Qg4 or play Bxh6 to break the pins. If 19. …Ke8 20. Qg8+ Bf8 21. Qxf8# if 19. e6 Qxg7+ 20. Ke8 Qg8+ 21. Ke7 Qxf7#

Going back to other black defenses, it looks like black must find a way to get the most material for the queen on the 18th move. 18. …Qxb5 doesn’t work because of 19. Nxe5+ and mate on g8 or f7. 18. …Qe6 19. Ng5+ (Nxe5+ and Ndf6+ look better at first, but I can’t see a finish after Bf6 because the queen guards g8 now) Qf6 (Bf6 20. Qh8#) 20. Rxf6+ gxf6 and black’s got a reasonable return and is now threatening check on d1 and the knight

White can also try 18. … Qe6 19. Nc7 Nxf7 20. Nxe6+ Bxe6 21. Qxe4 when white has the black queen and a pawn for three minors and is threatening the b7 pawn and e6 bishop

I feel like I’m missing a nice finish in the lines where black gives up the queen. Time to check….

----
Same as yesterday, missed black’s critical defense with 18. …Nf3+ 19. gxf3 exf3 and white can’t play Rf3 yet because of Qd1+ … No credit for me as one needed to have seen Nh6 in response to black’s block of the f-file…

Jun-28-13
Premium Chessgames Member
  Dionysius1: Harumph. I wanted to play 18 Nc7 followed by Ne6 and Qg8+. The idea didn't even come into the solution.
Jun-28-13  cocker: Exchanging queens on move 10 might have saved Black some trouble.
Jun-28-13  morfishine: I figured <18.Nxf7 Nxf7 19.Bh6> was the "main line" and didn't consder the interruption move 18...Nf3+

In any case, its refreshing to see an IM destroy a GM

Jun-28-13  Dr. Funkenstein: yeah, I think Newzild nailed it when he gives the critical line of

18. Nxf7 Nf3+ 19. exf3 e3! 20. Nxd8 Nc4!

Full credit to anyone else besides Newzild who spotted this clever defense. White's going to be up the exchange I think, but the position looks far from won for white....

Jun-28-13  Skiamacher: 18.Nxf7 Nxf7
19.Bh6 Qf5
20.Qxg7+ Ke8
21.Nc7+ Kd7
22.Rxf5

Must check now to see if I've missed a better defence for Black. ---

So Lobron tried to escape from the inevitable via another futile route!

Jun-28-13  cunctatorg: I think that the main issue here is the refutation of the move 18. Nc7 ..., that is the counter-sacrifice 18... Nf3; what do you think, isn't the last move the only refutation of 18. Nc7?
Jun-28-13
Premium Chessgames Member
  chrisowen: I jewel of the queen I leaping lizard it is a cinch?

A putter 16...Nxe5 to the sword gives a fetching king,

robbed of his pawn cover service niggle nf7 look it a gift horse beckon f7 low rider hes unable to,

recapture still h6 invades queen hoofing g7 at,

exchange off re h6 plowed if correct knight will open her suitor queen dutiful f5 end tenure a floatings 19...Qf5 knight interpose a wave in c7?

Good foresight I be 12.na3 a loop 14.nb5 key piece,

for c7 om bined it a - spyxiate rookand queen deprived of air game changer supply in a quadgrip 18.Nxf7 I grappling 18...nf3+ to interpose round,

off evers even check av I a duct-tape 19.gxf3,

looses knight having fun in the suns queen heating,

f5 in tempt e3 have envies queens h7 and d7 could,

face off 20.nh6 fly in light having bodge oomph it down 20.Qd5 rook checked aim duty ramble give it is banking e8 at find in wall it is a grain of truth queen seem bound for a killers height informers to,

be 22.nc7+ all over shah.

Jun-28-13
Premium Chessgames Member
  kevin86: It looks like the main idea was to chase the king to e8-to fell the queen by a fork.
Jun-28-13
Premium Chessgames Member
  kevin86: Lobron gets stuffed!
Jun-28-13  Prosperus: 18. ... Nxf7 19. Bh6 Qe6/Qg4/Bxh6 simple 20. Qh6#
Jun-28-13  BOSTER: <PB> <I'm satisfied with spotting the main idea>.

Your idea is corect and nice.
The problem is only one that black can't afford such <luxurious> life for white, even in the real game he did. When I see reading the comments, after 18.Nxf7 the answer 18...Nxf7, I skip such comments. After 18.Nxf7 Nf3 + 19.gxf3 e3 I guess that white will win but without brilliance.

Jun-28-13  Patriot: Time: 5 minutes

I'm not so sure about this one. White is down material so 18.Ne6+ Qxe6 19.Nc7 does not look right.

I would've had to try something like 18.Rf4 or 18.Bf4.

So much for that!

Jun-28-13  James D Flynn: Materially White is a piece and a pawn don but he has threats against the Black K, 18.Nc7(threat 19.Nxa1 with a slight material advantage but the more important threat is 19.Nfe6+ Qxe6 20.Nxe6 Bxe6 21.Bh6 Ke8(not Bxh6 22,Qh8#)22.Bxg7 Ng6 23.Rad1 and mate is unavoidable) e6 19.Ncxe6+ Ke7 20.Qxg7 Nd3 21.Rxf7+ Kd6 22.Qg6+ Kc7 Rxd7+ 23.Rxd7 Rxd7 24.Bf4+ and White has a winning material advantage.
Jun-28-13  M.Hassan: "Difficult"
White to play 18.?
White is a Bishop+pawn down.

18.Nxf7 Nxf7
19.Bh6
<if...Bxh6 20.Qxf7#> 19........Qg4
20.Qh8#
exploitting two pins and mating.
After this solution, I thought this is too simple for a "difficult" Friday and revised it to continue the line below:

18.Nxf7 Nf3+
19.gxf3 e3
20.Nxd8 Qxb5
21.Bxd3 c4
22.Bh6 Ke8
23.Rd1 Nd7
24.Qxg7 Kxd8
25.Bf4 Qc5+
26.Kg2 e5
27.Bxe5 b6
28.Qg8+ Ke7
White is stronger and should win

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