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Kiril Dimitrov Georgiev vs Alexey Shirov
Biel (1992), Biel SUI, rd 12
Sicilian Defense: Four Knights Variation (B45)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Sep-18-19  Walter Glattke: 23.-Qc5 24.Qxf6+ Kd7 25.Qxf7+ Kc6 26.Qxg8 Qxe3+ 27.Kh1 Qg5!? 28.Qd5+ wins.
Sep-18-19
Premium Chessgames Member
  agb2002: White has a bishop for a knight and a pawn.

The rook on d1 x-rays the black queen. This suggests Bg6 and Bh7.

In the case of 23.Bh7 Qxg2+ 24.Qxg2 Rxg2+ 25.Kxg2 Rxh7 White still has a lot of work ahead.

In the case of 23.Bg6:

A) 23... Qe6 24.Bf5 traps the queen.

B) 23... Qxd1 24.Qxf6+ (24.Rxd1 Rhxg6 25.g3 h4) 24... Kd7 (24... Kf8 25.Qxf7#; 24... Ke8 25.Qxf7+ Kd8 26.Qxg8+ and 27.Rxd1 wins) 25.Qxf7+ Kc6 (else 26.Qxg8+ and 27.Rxd1) 26.Be4+ followed by 27.Rxd1 wins decisive material.

C) 23... Rhxg6 24.Rxd5 Rxg2+ 25.Qxg2 Rxg2+ 26.Kxg2 wins too much material.

D) 23... Qb5(c5,c6) 24.Qxf6+ Kd7 25.Qxf7+ and 26.Qxg6 wins a rook.

Sep-18-19  Cheapo by the Dozen: I found the correct line, but underestimated just how strong it was.

Looking at the puzzle, it quickly becomes clear that the answer should be some version of:

A. Discover an attack on Black's queen.
B. Don't let Black get away with only a small material loss.

Part B requires averting a capture/check at g2, which is done via the game move of 33 Bg6. Two tactical points are:

If 33 ... Qxd1, then White has a lot better than 34 Rxd1 in 34 Qxf6+.

If 33 ... Qe6, then Bf5 traps the queen.

Sep-18-19
Premium Chessgames Member
  patzer2: So where did Black go wrong? The clear, losing move appears to be 18...Qc5 allowing 19. Nd5+ +- (+2.87 @ 32 ply, Stockgish 10).

Instead, 18...Nc6 19. Nd5+ ± (+1.30 @ 31 ply, Stockfish 10) puts up more resistance for practical drawing chances.

Earlier, instead of 9...Be6, our Opening Explorer indicates Black has had more success with the popular move 9...b5 as in the draw in A Giri vs Carlsen, 2019.

Sep-18-19
Premium Chessgames Member
  FSR: This one definitely rang a bell. I was going to respond, but I'll just let my answer from 11 years ago stand.
Sep-18-19  Steve.Patzer: I have not read all the comments yet, but what do you call that tactic? A blockade? A discovered attack on the Queen?
Sep-18-19  saturn2: I saw after 23 Bg6 Qe6 (otherwise 24 Qf6+ or Rd5) 24. Bf5 the black queen is trapped.
Sep-18-19  saturn2: So also Shirov does not like 5 c4 avoiding it by 4...Nf6. We were talking about this last week. After 4..Nc6 there is also 5 Nb5 d6 (Qa5+ 6 N1c3) 6 c4 like Morphy and Fischer played.
Sep-18-19  TheaN: Oh that's painful: former self beats current self. 11 years I saw it with all the variations to boot, now I just settled on 23.Bh7?! way too quickly. Critical part is that in 2008 I calculated <only> Bg6, now glanced <only> at Bh7. When you see a good move bladibla.

Interestingly, at some point I started adding time to my solves but in 2008 I hadn't yet, so I have no idea how long I took when the puzzle was first used. Now, not even a minute, yet failing. As Bg6 was my only candidate move in 2008, may not have been that long after all.

Shucks.

Sep-18-19
Premium Chessgames Member
  malt: Got 23.Bg6 Qc5

(23...Qe6 24.Bf5 )

24.Q:f6+ Kd7
(24...Ke8 25.Qe6+ Kd8 26.R:f7 wins )

25.Q:f7+ Kc6 26.Q:g8

Sep-18-19  Cheapo by the Dozen: <Steve.Patzer>:

The bishop moving is a discovered attack. Bg6 in particular is also interference with both Black rooks at once.

Sep-18-19  Cheapo by the Dozen: Long ago somebody suggested 29 ... Qxg2+. But that fails since White can just recapture with the king.
Sep-18-19  mel gibson: Stockfish 10 agrees with the move and says:

23. Bg6

(23. Bg6 (♗d3-g6 ♕d5xg2+ ♔g1xg2
♖h6xg6+ ♔g2-h1 ♘a5-c6 e3-e4 ♖g8-d8 c2-c3 ♖g6-h6 ♖d1-d3 ♖d8-d7 ♖d3-f3 ♔e7-d8 ♖f3-f5 ♖h6-g6 ♖f5xf6 ♖g6xf6 ♕f2xf6+ ♔d8-c7 ♖f1-f5 h5-h4 ♕f6xh4 ♘c6-d8 ♖f5-h5 b7-b5 ♕h4-f6 ♘d8-e6 ♖h5-h6 ♘e6-d8 ♕f6-f2 ♔c7-b7 ♕f2-f5 ♔b7-c7 b3-b4 ♘d8-e6 ♖h6-f6 ♘e6-d8 ♔h1-g2 ♘d8-e6 ♖f6xf7 ♘e6-f4+ ♔g2-h1 ♖d7xf7 ♕f5xf7+ ♔c7-c6 ♕f7-a7) +9.87/40 180)

score for White +9.87 depth 40.

Sep-18-19  Checker2: The bishop always stays on its own colour, but it can and sometimes should change the colour of the rook it is blocking.
Sep-18-19  scormus: Ooooh, very cute! I guess even Shirov can miss it. I think there should be a new move descriptor for cases like this: 23 Bg6;)
Sep-18-19
Premium Chessgames Member
  patzer2: Instead of 11...gxf6 ± (+0.70 @ 36 ply, Stockfish 10), perhaps Black can improve by avoiding the doubled pawns with 11...Qxf6 ⩲ (+0.34 @ 37 ply, Stockfish 10) as in Black's win in Kamsky vs Judit Polgar, 1994.
Sep-18-19  NrthrnKnght: Bh7 is better
Sep-18-19  mel gibson: <Sep-18-19 NrthrnKnght: Bh7 is better>

Checked that on Stockfish 10 -
it leads to a draw.

Sep-18-19
Premium Chessgames Member
  Jimfromprovidence: Here's another nice one-move puzzle I found in my vault, with white to play and win. Move 14.


click for larger view

Here is the game link.
Robson vs E Perelshteyn, 2010

Sep-18-19
Premium Chessgames Member
  perfidious: <Jim>, nasty, and surprising that such a strong player overlooked this variation of that overloading theme.
Sep-18-19
Premium Chessgames Member
  eternaloptimist: It took me 3 or so minutes to solve this puzzle. stages for me in solving this puzzle:
1. I saw that the f6 square could b a potential target 🎯 shortly after examining the position 2. I noticed that I could do a discovered attack on the opposing ♕ by moving the ♗. 3. I saw that f7 could possibly b a potential target as well. 4. I saw that:
discovered attack + interference tactic = winning position Then I knew that 23. ♗g6! is the correct move!
Sep-18-19  stacase: The White Bishp’s motor is running, where does he want to go?

Oh! How ‘bout g6, that will give Black nothing but bad choices trying to thwart the attack on his Queen and King.

Ha! Black tipped his King over

Sep-18-19
Premium Chessgames Member
  SugarDom: I thought e4 followed by Qd2 fork.
Sep-18-19
Premium Chessgames Member
  Breunor: I saw 23 Bg6 right away, but I thought Qe6 holds; it took me a while to see that after Qe6 white has Bf5!
Sep-18-19
Premium Chessgames Member
  Breunor: To add to Patzer 2 's analysis, the game really seems to turn against black with 15 Na5.

Best according to the computer is h5:

1) =0.00 (25 ply) 15...h5 16.O-O Rh6 17.Qd2 Qxb2 18.Nd5 Bxd5 19.exd5 Ne7 20.e4 Rg6 21.Rab1 Qd4+ 22.Kh1 Rc7 23.Qa5 Rd7 24.Qe1 Rc7 25.Rb4 Qa7 26.Rb1 Qd4

After the text move, we have:

1) +0.95 (21 ply) 16.O-O Ke7 17.Qe1 Nc4 18.Nd1 h5 19.b3 Na3 20.c4 Qc5 21.Nc3 b5 22.Rc1 bxc4 23.bxc4 Nxc4 24.Bxc4 Qxc4 25.Nd5+ Bxd5 26.Rxc4 Bxc4 27.Rf2

So this is where black starts to go wrong.

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