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Oleg Gavrilov vs Sergey Solovjov
NWAPA Rector Cup (2005), St Petersburg RUS, rd 12
Semi-Slav Defense: Meran. Wade Variation (D47)  ·  0-1



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+ sac: 31...Nxh3+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-03-09  cheeseplayer: I never saw the pawn on e5!
May-03-09  FrogC: I got as far as 33...Rxh3+ and then noticed that the White Bishop and Queen were preventing my intended Qh6 mate. At which point I decided I must be on the wrong track and soon gave up. That's the closest I've ever got to a Sunday puzzle.
May-03-09  engineerX: The most impressive for me is that Black's combination begins earlier than the diagram position. With 27...Nf4 black has a forced win, which he demonstrated in the game. But I guess that would be too difficult a puzzle,
May-03-09  tivrfoa: what make this insane is associate:
30. ... e4 with 34. ... Qc8+!!!

Maybe many people people get 30. ... e4, but few of them saw 34. ... Qc8. xD

May-03-09  cyclon: Really great, particularly idea behind blacks last two moves; 33. -Rxh3+ and 34. -Qc8+.
May-03-09  Samagonka: Not an easy nut to crack...
May-03-09  znprdx: Wow Qc8+ very elegant indeed
Fascinating mind flip: after 34. Qf5 one tends to think the queen must maintain the pin and that the threat is Rh2

I was so pleased with myself finding 33...Qg6 so if 34.Rg1 Rxh3+ 35.K x[R]h3 Rh7+ 36.Qh4 Qf5+ 37.Rg4 Qf3+ 38.Rg3 where Black at best has a perpetual check.

<engineerX:... With 27...Nf4 black has a forced win> good observation. I'm curious however what happens if 29.Qg3

May-03-09  Utopian2020: White clearly had in mind exchanging queens, but blacks e4 move refuted that idea. White should have then taken the next best option and exchanged queen for knight and rook. White's odds while not great with R+R+B against Q+R, does have a fighting chance.
May-03-09  Utopian2020: 29. Qg3 Ne2+
May-03-09  Eduardo Leon: 30. ... e4
This move not only prevents the exchange of queens, but forces...

31. Qf2

... taking a square which could have been useful for white's king in the following sequence.

31. ... Nxh3!

Opening the g file. Note how the white queen and rook prevent his own king to escape the mating net.

32. gxh3 Rg7+ 33. Kh2

Up to this point, everything is easy to see. But it's the following tactical shot which places the cherry on top of the cake.

33. ... Rxh3!

Surprise! Black's queen will move to the h file, with mate.

34. Kxh3 Qc8+!

And black mates in, at most, three moves. White's disgrace relies in the fact that there's no square in the h file that can be controlled with two pieces at the same time.

May-03-09  Trigonometrist: Nope! Never saw 30. .. e4...It's been a month since I saw a sunday puzzle...
May-03-09  johnlspouge: Sunday (Insane):

O Gavrilov vs S Solovjov, 2005 (30...?)

Black to play and win.

Material: N for B. The White Kg1 has 3 legal moves. The Black Qc6 and Nf4 both attack Pg2, although the White Qf3 pins Qc6 to Kb7. The Black Rh4 and Nf4 both attack Ph6, and the Black Rd7 has an open file and can reload Rh4. The White Be3, Qc3, and Rf1 attack Nf4, while Ra1 is passive. The Black Kb7 is vulnerable to Qf3xc6+, but is otherwise secured from checks. To avoid a release of tension and a subsequent draw, Black must keep the Qs on the board.

Candidates (30…): Nxh3+, e4


(1) 31.Qf2 [Qg3 Ne2+] Nxh3+ 32.gxh3

32…Rxh3 (threatening 33…Rg7+, 33…Qg6+, or 33…Rxe3)

<[Toga indicates the game alternative 32…Rg7+ is better, but 32…Rxh3 still evaluates at worse than -3.0 P for White.]>

White needs to put R or B in front of Kg1, but cannot.

(1.1) 33.Kg2

33...Qe6 (threatening 34…Rg7+ 35…Rf7 or 34…Qg4+ 35…Rh2+)

Black loses Qf2, which cannot move off both rank and file because 34.Qe1 permits mate.

(1.2) 33.Qf4 Rg7+ 34.Kf2 Rf3+

(2) 31.Qxf4 Rxf4 32.Rxf4

White maintains a P shield around Kg1, but is now in a losing endgame.

May-03-09  patzer2: <LIFE Master AJ: Does 31.Qf2 qualify as a mistake/blunder? (BTW, I missed this one.)> Perhaps it does for me, as I forgot to mention in my initial post that 30...e4! begins the combination by forcing 31. Qf2. I saw that almost immediately, but it came so quick and easy that I failed to make this key observation (i.e. 30...e4! creates the position that makes the combination 31...Nxh3! possible). The hard part of the combination, for me at least, was visualizing the backward moving Queen check 34...Qc8+!, which forces a quick mate in three or less moves.
Premium Chessgames Member
  agb2002: White has a bishop for a knight and two passed pawns against one. White would win the endgame if all heavy pieces disappeared from the board. White threatens Qxc6+ and Bxc5 (the black queen is pinned). Therefore, 30... e4 31.Qf2 (31.Qg3 Ne2+) Nxh3+ 32.gxh3 Rxh3, threatening 33... Rg7+:

A) 33.Bg5 Rg7 34.Qg2 (34.Qf5 Rg3+) Rh5 - +.
B) 33.Rfc1 Rg7+ 34.Kf1 Rf3 35.Rxc5 Rxf2+ - +.
C) 33.Bf4 Rg7+ 34.Bg3 Rgxg3+ - +.
D) 33.Qf4 Rg7+ 34.Kf2 Rf3+ - +.
E) 33.Qf5 Rg7+ 34.Bg5 Rh5 - +.
F) 33.Qg2 Rxe3 - +.

Instead of a won endgame with two extra pawns, a quicker method is 32... Rg7+ (instead of 32... Rxh3) 33.Kh2 (33.Kh1 Rxh3+; 33.Qg2 Rxg2+ 34.Kxg2 Qg7+ 35.Kh2 Qg4) Rxh3+ 34.Kxh3 Qc8+ 35.Qf5 (35.Kh4 Qg4#; 35.Kh2 Qh1+) Qh1+ and mate in two.

I think that's all.

Premium Chessgames Member
  fm avari viraf: Well, the insane problems would make you sweat but fortunately, this one looks pretty getatable. The logical sequence would be 30...e4 attacking the Queen & now the White Queen seems to be in jeopardy as 31.Qg3 loses to Ne2+ so the White Queen has only 32.Qf2 Now, Black can pounce with his pieces to rip open the castle with 32...Nxh3+ 33.gxh3 forced 33...Rg7+ since the g & h files are open this combination is possible 34.Kh2 Rxh3+! 35.Kxh3 Qc8+! & White can't save the mate. Look, how all the white's pieces witness their King's tragic end in distress.
May-03-09  WhiteRook48: well, it's easy to miss a Sunday puzzle
May-03-09  David2009: I missed it. Without 34 ...Qc8+!! (as missed) Black is busted: e.g. 34...Ra7+? 35 Kg4 Qe6+ 36 Qf5. White must have had a horrible shock when Qc8+ was played.
Premium Chessgames Member
  agb2002: <johnlspouge: ...

(1.1) 33.Kg2

33...Qe6 (threatening 34…Rg7+ 35…Rf7 or 34…Qg4+ 35…Rh2+)>

I saw 33... Rf3 (I notice that I forgot to include 33.Kg2) but 33... Rg7+ is probably better (transposes to the game line).

May-03-09  muradov: got it in 20 secs. :)
Premium Chessgames Member
  sbevan: I missed it but I think this is a seven mover: it goes back to move 27. After 27 Qxf6 to see not only Nf4 but then to see that 1. the intermediate check Qg7 does no harm and
2. that 29...Rh4 is the first nail in the coffin really takes imagination!
Premium Chessgames Member
  Jimfromprovidence: Just for the record, 34…Rh7+, below, is no good because white can exchange queen for rook and still be slightly ahead.

click for larger view

For example, 35 Kg2 Rg7+ 36 Qg3 Nxg3+ 37 Kxg3 gives white a slight edge.

click for larger view

May-03-09  SuperPatzer77: 34...Qc8+!! is the real killer below:

White's three tries are below:

1) 35. Kh4 Qg4#

2) 35. Qf5 Qh8+ (mates in two moves), 36. Bh6 Qxh6+, 37. Qh5 Qxh5#

3) 35. Kh2 Qh8+ (mates in two moves), 36. Bh6 Qxh6+, 37. Qh4 Qxh4#


Of course, we've overlooked 34...Qc8+!! that leads to quick checkmate.

<tdnn72: holy @#$%..> Yeah, I would like to say "Holy Toledo!!!!" when we see 34...Qc8+!!!.


May-04-09  LIFE Master AJ: No comment on 31.Qf2?
Premium Chessgames Member
  chancho: <AJ> patzer2 posted a response to you on May 3. (regarding 31.Qf2.)
May-06-09  LIFE Master AJ: <chancho> Thanks!
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