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Daniil Yuffa vs Viktor Antonovich Bologan
Qatar Masters (2015), Doha QAT, rd 2, Dec-21
Slav Defense: Slav Gambit. Alekhine Attack (D10)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-16-18  mel gibson: When Black resigns Stockfish 8 says:

(38. .. Rxe5 (♖e8xe5 ♗b4-c3 ♖e5-e2 ♔h2-g3 a7-a5 h4-h5 ♔h8-h7 ♗c3xg7 a5-a4 ♗g7-e5+ ♔h7-g8 ♗e5-f6 ♖e2-e6 ♗f6-c3 ♖e6-b6 ♖d7-g7+ ♔g8-f8 ♖g7-a7 ♔f8-g8 ♖a7-a8+ ♔g8-f7 ♖a8xa4 ♖b6-c6 ♖a4-a7+ ♔f7-g8 ♔g3-f3 ♖c6-h6 ♖a7-g7+ ♔g8-f8 ♖g7-g5 ♔f8-e7 ♖g5xf5 ♖h6-d6 ♗c3-d2 ♖d6-d7 g2-g4 ♔e7-e6 ♖f5-b5 ♖d7-f7+ ♔f3-e4 ♖f7-f2 ♔e4xd3 ♖f2-g2 g4-g5 ♔e6-f7 ♖b5-b7+ ♔f7-g8) -7.31/32 182)

score for Black -7.31 depth 32

Feb-16-18
Premium Chessgames Member
  malt: Gone for
30.f4 Be8 31.Q:h6+ Kg8 32.fe5 gh6 33.Be7 Rf7 34.R:a7 d4 35.d7 B:d7 36.R:d7
Feb-16-18
Premium Chessgames Member
  agb2002: White is two pawns down.

The black queen is giving check.

The natural move is 30.f4:

A) 30... Qxd6 31.Qxh6 Kg8 32.Q(R)xg7#.

B) 30... Qxb2 (White must take into account Bf1 and b2) 31.Qxh6+ Kg8 32.Qxe6+

B.1) 32... Kh8 33.Bh6

B.1.a) 33... gxh6 34.Qxh6+ Kg8 35.Qh7#.

B.1.b) 33... Bf1 34.Bxg7+ (34.Qxd5 Qxg2+ -34... Qf2 35.Bxg7+ and mate in two- 35.Qxg2 Bxg2 36.Kxg2 Rb8 37.d7 b2 38.d8=Q+ Rxd8 39.Rb7 also seems to win) 34... Qxg7 35.Rxg7 Kxg7 36.h5

B.1.b.i) 36... b2 37.Qg6+ Kh8 38.h6 Rg8 39.Qf6+ Kh7 40.d7 b1=Q (40... Rg6 41.Qxb2 Rxh6+ 42.Kg1 with the double threat d8=Q and Kxf1) 41.d8=Q wins (41... Rxd8 42.Qg7#).

B.1.b.ii) 36... Rf6 37.Qe7+ Rf7 38.h6+ Kg6 (38... Kg8 39.Qe8+ Rf8 40.Qg6+ Kh8 41.Qg7#) 39.Qg5+ Kh7 40.d7 Rxd7 41.Qxf5+ Kxh6 42.Qxd7 b2 43.Qb7 wins.

B.1.c) 33... Rg8 34.d7

B.1.c.i) 34... Bf1 35.Bxg7+ wins (35... Rxg7 36.Qh6+ and mate in two; 35... Qxg7 36.Rxg7 Kxg7 37.Qxg8+ Kxg8 38.d8=Q+, etc.).

B.1.c.ii) 34... Bxd7 35.Rxd7 with the threat Qg6-Bxg7+ looks winning.

B.2) 32... Kh7 33.Qh6+ Kg8 34.Qg6 with many threats (h5-h6, Be7, d7) seems to win.

C) 30... Qd4 31.Qxh6+ as above.

Feb-16-18  saturn2: <Malt Gone for
30.f4 Be8 31.Q:h6>

I think in your line 31 QxBe8 just wins a piece
Feb-16-18
Premium Chessgames Member
  malt: <Saturn2> Yes, Well spotted that man 31.Q:e8 Q:d6 32.Qe7
Feb-16-18  trnbg: way too easy for Friday.
Feb-16-18  njchess: A bit easy for a Friday, but I will take it. 35. f4 ♕d4 (Black's queen is pinned to that diagonal, or else mate follows) 36. ♕xh6+ ♔g8 ▢ 37. ♕e6+ ♔h8 38. ♕e5 Δ mate in one ♕xe5 39. fxe5 +-
Feb-16-18
Premium Chessgames Member
  Breunor: Strange puzzle; Friday puzzles are usually out of my league, I may get one in 5 or 10; but here the first few moves are all forced.

30 f4 is obvious to even beginners; Qd4 or Qxb2 are the only moves that don't give white either a won queen (with mate imminent) or mate in two.

Then again 31 Qxh6ch or Bxh6 both are winning; I went for 31 Qxh6ch Kg8 32 Qxe6ch Kh8, again this is pretty easy to spot.

I then went for 33 d7; according to Stockfish this is something like +13; but here pretty much every move wins.

I do think the text 33 Qe5 is very good, even though it has a lower Stockfish score than other moves here, the idea of eliminating queens in a won position is a great lesson for beginners and powerful GM's alike.

Feb-16-18  gofer: Hmmm, we are in check, so there are very few first moves to look at. But there is only one defence that is really forcing for white (as it attacks the checking piece). So I will ignore the rest, but the issue I have is that the main line I have found just wins pawns, so its not a "slam dunk" - which makes me think I have missed something!

<30 f4 ...>

White threatens Qxh6+ and then Qxg7#, so the white queen must be attacked OR the black queen must stay on the a1-h8 diagonal.

30 ... Be8 (Be2 is worse)
31 Qxh6+ Kg8
32 fxe5 Bxh5
33 Be7 +-

Black must give up a piece to stop the pawn.

30 ... Qxb2
31 Qxh6+ Kg8
32 Qxe6+ Kh8/Kh7
33 Qxd5 +-

Black's position is in tatters and white's d6 pawn is going to win a piece before black b3 pawn can threaten promotion!

~~~

Okay, pretty simple really...

Feb-16-18  BOSTER: Maybe 33.Bh6 is the best.
Feb-16-18
Premium Chessgames Member
  Breunor: Move 33, according to Stockfish:

d7, 13.86
Qe5, 5.37
Bh6, 9.28
Qe7, 7.37

Everything wins.

Feb-16-18  eblunt: <Gofer :>

30 ... Be8 (Be2 is worse)
31 Qxh6+ Kg8
32 fxe5 Bxh5

Isn't Whites Queen on h6 now ?

Feb-16-18
Premium Chessgames Member
  morfishine: Kind of a ho-hum solution; perhaps the point was simply to notice that White King was in check
Feb-16-18  goodevans: I have to admit not even considering <30...Be8>. Having overlooked that I can't really justify giving myself the full point on what was still one of the easiest Fridays for a long time. Damn!

After <31.Qxh6+ Kg8 32.fxe5 gxh6 33.Bxh6> black has no good moves, e.g. <33...Rf7 34.Rc8 Kh7 35.Rxe8 Kxh6 36.Rxe6+ Kg7 37.Re7> and black is toast.

Feb-16-18  eblunt: < gofer > oops brain fail completely, it's the pawn that takes it !!
Feb-16-18
Premium Chessgames Member
  malt: <Gofer><goodevens> I had used 30...Be8 <Saturn2> pointed out, black loses the piece 31.Q:e8 Q:d6 32.Qe7

The good side is By playing
30.f4 Be8 <31.Q:h6+>... Kg8 32.fe5 gh6 33.Be7 Rf7 34.R:a7 d4 35.d7 B:d7 36.R:d7 White wins the bishop by a longer route

Feb-16-18  NBZ: Just like Richard Taylor, I didn't see that the White king was in check. That makes it a more interesting puzzle, because the natural Qxh6+ Kg8 falls short since the Black queen guards both e6 and g7, so the move f4 is needed to divert the queen from the defence of e6.

Of course with the White king in check, f4 just about plays itself.

Feb-16-18  goodevans: <malt>, <Saturn2>,

I'm afraid <30...Be8 31.Qxe8> doesn't win a piece because of <31...Rxe8 32.fxe5 hxg5>.

White is still winning but not as convincingly as <30...Be8 31.Qxh6+>.

Feb-16-18
Premium Chessgames Member
  malt: <goodevens> Just rechecked, the position, 31...Be8 is correct, I was right with my original post.
Feb-16-18  lzromeu: If you don't forgot the check you answered easily this puzzle
Feb-16-18
Premium Chessgames Member
  Breunor: Stockfish gives 30 ... Be8 a score of 8.43 for white:

31 Qxh6ch Kg8
32 fxe5 gxh6
33 Bxh6

If black plays Rf7 then

34 Rc8 Kh7
35 Rxe8 Kxh6
36 Rxe6

Which evaluates at over 10.

Feb-16-18
Premium Chessgames Member
  al wazir: I don't see why 30. g3 isn't just as good as 30. f4. If 30...Qd4, then 31. Qxh6+ Kg8 32. Qxe6+ Kh8 33. Be3. How can black stop the advance of the d-♙?
Feb-16-18  saturn2: <goodevansI'm afraid 30...Be8 31.Qxe8 doesn't win a piece because of 31...Rxe8 32.fxe5 hxg5>. 33 Re7 and black is lost. The pawn on e6 falls and white has the connected passed pawns.
Feb-16-18  landshark: Went with 30. Kh3 with the idea that ...Qxb2, 31.Bxh6, Be2, 32.f3 and white's attack gets there first. Not certain it will pan out but the game continuation eluded me because I thought taking on b2 was fine for black.
Feb-17-18
Premium Chessgames Member
  Richard Taylor: <NBZ: Just like Richard Taylor, I didn't see that the White king was in check. That makes it a more interesting puzzle, because the natural Qxh6+ Kg8 falls short since the Black queen guards both e6 and g7, so the move f4 is needed to divert the queen from the defence of e6. Of course with the White king in check, f4 just about plays itself.>

Yes. The penny dropped after a while. Sometimes the 'obvious' is not so...

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