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Efim Geller vs Predrag Ostojic
Belgrade (1969), rd 3, Nov-??
Sicilian Defense: Accelerated Dragon. Maroczy Bind Gurgenidze Variation (B36)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Given 19 times; par: 33 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Sep-30-07  stanleys: Another variation of the "weakness of the back rank".Geller's last move is the fatal mistake - he could have played 28.Rg1 instead

Nice finish by Ostojic though

Oct-01-07  syracrophy: 28...♕e4!! Could make a great Monday puzzle
May-27-08  Madman99X: 28. Qe4! Removes the pin on the rook that sits on the 7th rank, and white must lose material or be mated.
May-27-08  zooter: 28...Qe4 puts white in a very bad position...

White has a few choices:

a) 29.Qxe4 -- which is bad and helps Rf1+ followed by mate and is the main idea behind Qe4

b) 29.Qd5 Qxd5 followed by a)

c) 29.Qc8+ Rf8 and white has to save his queen and mate. So he better give up

Time to check. A little difficult for a Tuesday as 28..Re4 is an equally tempting move and even after the correct move the queen check needs to be calculated

May-27-08  dzechiel: Black to play. Material even. "Easy."

Black's threat of a back rank mate (...Rf1+) is obvious and would certainly seem to play a part in this game.

The only thing that stops this is the rook pin by the white queen. If black can successfully break that pin, then the game is his.

At first I wanted to play 28...d5. This move attacks the white queen and the black queen is immune from capture because of the aforementioned back rank mate. But, white can simply play 29 Qe1 and hold it all together. This told me that my move must not only chase the queen off of the a2-g8 diagonal, but it must also stop the white queen's retreat to the first rank. That's when I saw

28...Qe4

This has the best of both worlds. The white queen is under attack. Defending the queen with a move like 29 Re3 does no good because of 29...Qxe6 30 Rxe6 Rf1+ 31 Rxf1 Rxf1#.

And, white can't capture with 29 Qxe4 because of 29...Rf1+ etc. So, it looks like it's time to run. But where to? 29 Qd5 maintains the pin, but only for a moment after 29...Qxd4 30 cxd5 Rf1+ etc. And 29 Qh3 allows the immediate 29...Rf1+. It looks like white's best try is

29 Qc8+

But after

29...Rf8

Black has TWO threats for white to deal with, 30...Rxc8 winning the queen and, if the queen moves off of the eighth rank, 30...Rf1+.

This is the point where white must have resigned.

Time to check.

May-27-08  newzild: hmmm. I thought 28...d5 looked winning and stopped there.
May-27-08  Billy Vaughan: Yay, I got this one too. Rf1 mates if you can break the pin, so just find the most forceful way of doing so. White has to shed the Queen to prevent immediate mate.
May-27-08  Tactic101: A nice simple example of deflection. We see that if the queen were deflected away from its square, where it pins the f7 rook, we can mate on f1.
May-27-08  jovack: remove the queen and backrank... it seems as if tuesdays are easier than mondays... generally speaking
May-27-08
Premium Chessgames Member
  BishopofBlunder: Spent 4 of the 6 minutes I took solving this thinking it was "White to move". Then went with 28...d5. Bad day all around...
May-27-08  TheaN: 2/2

28....Qe4 is really painful for White, very effectively breaking the pin on the f7-Rook.

29.Qxe4 Rf1+ 30.Rxf1 Rxf1#

29.Qd5 Qxd5 30.Rxd5 Rf1+ 31.Rxf1 Rxf1#

29.Qc8+ Rf8 and White is forced to give the Queen.

May-27-08
Premium Chessgames Member
  Once: The unmoved pawns in front of the white king plus our doubled rooks on the f file suggest a back rank mate.

But we can't play Rf1+ straight away because our f7 rook is pinned by the white queen.

So how can we get rid of the white queen? Qd7 and d5 don't work because of Qe1, defending the back rank. So that's when we hit on Qe4.

There is another tempting line which probably also wins. 28. ... Rf2 threatens both tha a2 pawn and mate on g7. White is forced to go passive with either Rg1 or Rg3. But let's not grub around for single pawn when there is a mate in the offing.

May-27-08  bertrds: dzechiel, your comments are very instructive.
May-27-08  Samagonka: This puzzle really confused my mind because I never even realised that one of the black rooks was pinned! Even after 13 years of playing chess, I'm still a beginner! Like <bertrds>, I also appreciate dzechiel's contribution.
May-27-08
Premium Chessgames Member
  whiteshark: To mate on the first rank the black ♕ isn't necessary. The only task is to unpin ♖f7 by deflecting ♕e6w/o moving back to e2. Thus <28...Qe4!!>


click for larger view

May-27-08  zanza: Looking for 28. ..., d5, but missing 29. Qe2 that seems to holds! :-| Ouch....
May-27-08
Premium Chessgames Member
  johnlspouge: Tuesday (Easy): Black to play and win.

Material: Even. The White Kh8 is vulnerable to back-rank mates. Black has a battery Rg7 and Rg4 ready to oblige with

28...Rf1+ 29.Rxf1 Rxf1#

but unfortunately, the White Qe6 pins Rf7 to Kg8. White Qe6 must therefore maintain her post at all costs, so Black should try to deflect Qe6 at all costs, and with tempo, before White can play h3 or some similar move, to relieve the back-rank mate threat.

Candidates (28): Qe4

28Qe4 (threatening 29Qxe6 and 28...Rf1+ 29.Rxf1 Rxf1#)

To meet the threat 29Qxe6, White must counter with either: (1) capture Qe4, (2) protect Qe6, or (3) check Kg8. The counter (1) does not prevent mate; the counter (2) fails to 29Qxe6, followed by mate; and the counter (3) fails to lateral defense with the Rs, because Qe6 remains under threat:

29.Qc8+ [Qe8+ Qxe8] Rf8

White must lose at least Q for R.

May-27-08  znprdx: I love these kind of thunderbolts...OTB how many players would have settled for ...Kg7 or the erroneous... Re4? or the novice level ...Rf2 (BTW I don't understand the ..d5 idea)
May-27-08  Waitaka: <newzild> I also went with ...d5. Never considered Qe1.
May-27-08  TrueBlue: much better puzzle than yesterday, but it looks like a Monday puzzle.
May-27-08  234: Monday puzzle <25. ?> May-26-08 Koltanowski vs NN, 1945
May-27-08  griga262: Pretty simple. First I looked at ♖e4, which would chase the White ♕ away pretty effectively, but would also eliminate the attack on the f-file. That's when I realized that putting my ♕ in the same spot instead will do the trick. I would have most likely missed it OTB, though.
May-27-08  SuperPatzer77: 28...Qe4!! is much stronger than 28...d5.

If 28...d5??, 29. Qe2! to stop the rank mate. Black's key move is 28...Qe4!! to unpin and prevent the White Queen from getting to e2.

This move forces White to lose the White Queen or get mated.

SuperPatzer77

May-27-08  zb2cr: 28. ... Qe4 deflects the White Queen from the pin it is currently holding on Black R at f7. White's position then comes apart like a house of cards, due to his vulnerable back rank.
May-27-08  waustad: I looked at Qe7 with the same idea, but with the weakness that the white Q can retreat.
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