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Leinier Dominguez Perez vs Dmitry Jakovenko
FIDE Grand Prix Khanty-Mansiysk (2015), Khanty-Mansiysk RUS, rd 2, May-15
Semi-Slav Defense: General (D43)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-13-16
Premium Chessgames Member
  Penguincw: It's Friday the 13th!

And I got a shocker here, as for a second, I almost though that <cg> <PREDICTED> my (and everyone else's) comments for this POTD, only to see this was 2015 (although I have no memory of seeing this game).

Hard to tell whether or not I got this puzzle last time, but this puzzle, seems a bit easier than normal for a Friday (but in fairness, early this week was <hard>).

I got 31.d7. I hoped black would play 31...Rd8, then 32.Qb4+ Kf8 33.Qe7, and white is winning, but I completely missed 31...Bxd7.

But, if I saw 31...Bxd7, can I still solve the rest of the puzzle? Well, I see 32.Rxd7 b1=Q, but then I would slip with 33.Qb4+. After 33...Kg8, if 34.Bxb1, then 34...Qe3+, and notice how the white queen isn't on a3 to defend e3.

After 33.Qa3+ Kg8 34.Bxb1, white is pretty much winning, piling up on f7, and avoiding the queen checks. If 34...Qxb1, 35.Qe7, back rank problems!

May-13-16  alfiere nero: I only figured out 31. d7 as the best initial move. Do I get a point? I'm actually pretty proud of it!
May-13-16
Premium Chessgames Member
  patzer2: Bombed on this Friday puzzle with the failed defensive effort 31. Rd2?? which loses big time to 31...c1=Q 32. Bxb1 Qxd2 (-15.37 @ 20 depth, Deep Fritz 15)

Looked at the winning 31. d7! but stopped my calculations after 31...Bxd7 32. Rxd7 c1=Q 33. Qa3+ Kg8 34. Bxb1 Qxb1 (diagram below),


click for larger view

failing here (diagram above) to see 35. Qe7! which forces mate-in-11 (Deep Fritz 15).

For a Black improvement, the computer suggestion 23...Qc2 = to (-0.39 @ 25 depth, Houdini 4 x 64) looks good.

May-13-16
Premium Chessgames Member
  al wazir: Couldn't white have played 30. d7, one move earlier, and won the same way? If 30...Bxd7, then 31. Rxd7 d1=Q 32. Bxb1, and now if 32...Qxb1 then 33. Qe7!
May-13-16  plumbst: Qa3+! is key. I got to the end, but played Qb4+? instead which in the gameline is foiled by 34. Bxb1 Qe3+!, resulting in a perpetual.
May-13-16  Coriolis: How does uncle silicon rate <31. Qb4>?
May-13-16
Premium Chessgames Member
  agb2002: White is one pawn up.

Black threatens 31... c1=Q.

The simplistic 31.Qxc2 (31.Bxc2 Rxe2#) leads to an unfavorable ending with one pawn down after 31... Qxc2 32.Bxc2 Rxe2+ 33.Kg1 Rxc2 34.d7 Bxd7 35.Rxd7 Rxb2.

The advanced pawn suggests 31.d7:

A) 31... Bxd7

A.1) 32.Qb4+ Kg8 (32... Re7 33.Rxd7 and mate soon) 33.Rxd7

A.1.a) 33... c1=Q 34.Bxb1 Qxb1 35.Qe7 Rf8 (35... Rxe7 36.Rd8+ Re8 37.Rxe8#) 36.Rd8 wins (36... Rxd8 37.Qxd8#).

A.1.b) 33... Qd1 34.Re7

A.1.b.i) 34... Rf8 35.Bxc2 Qxc2 36.Qxb7 Qc5+ 37.Kg2 Qxa5 and White is only a pawn ahead but has the better position.

A.1.b.ii) 34... Rd8 35.Qc4, with the double threat 36.Qxf7+ Kh8 37.Qxg7# and 36.Qxc2, ends up a piece ahead.

A.1.b.iii) 34... Rc8 35.Qc4, with the triple threat 36.Qxc8+, 36.Qxf7+ and 36.Qxc2 as in A.1.b.ii (35... Rxc4 36.Re8#).

A.2) 32.Rxd7 looks similar to A.1 but it's perhaps simpler because 32... Qd1 is met with 33.Rxd1 cxd1=Q 34.Qxd1 winning. Now 32... c1=Q 33.Qb4+ Kg8 34.Bxb1 transposes to A.1.a.

B) 31... Rd8 32.Qb4+ Kg8 33.Qe7 Rf8 34.Qxf8+ Kxf8 35.d8=Q#.

May-13-16
Premium Chessgames Member
  agb2002: I thought that Qa3+ or Qb4+ were the same but the essential difference is that the former prevents ... Qe3+ after Bxb1.

The devil is in the detail.

May-13-16  gofer: Black has lots of threats, so white needs to make his own...

<31 d7 ...>

Threatening dxe8=R#

31 ... Rd8
32 Qb4+ Kg8
33 Qe7!

31 ... Rb8
32 Qb4+ Kg8
33 d8=Q+ Rxd8
34 Rxd8#

31 ... Rxe4
32 d8=Q+ Re8
33 Qaxe8#/Qdxe8#

So the pawn has to be taken...

<31 ... Bxd7>
<32 Rxd7 ...>

White still has threats and it is difficult to see how black can avoid them, due to the following combination exploiting black's weak back rank; 33 Qb4+/Qa3+ Kg8 34 Qe7!

32 ... Rxe4?
33 Qxe4 mating

<32 ... c1=Q>

Black is hoping for 33 Bxb1 Qe3+ looking for all sorts of issues for white.

<33 Qa3+! Kg8>
<34 Bxb1 ...>

White has navigated the myre. The check on e3 is not available, but black has no time to re-capture the bishop due to Qe7 mating! So white is a full bishop up... GAME OVER!

~~~

Yep...

May-13-16  not not: black is to promote next move, so white only hope is violent king attack

I would push pawn to d7 threatening mate to tempt his bishop back

31. d7 (and after bishop takes and goes back)

32. Rxd7! letting him to promote queen and then

33. Qb4 check, so when kings moves, you've got this wonderful idea I saw in Tal's games many times

34. Qe7! (bulling rook due to back rank weakness)

I dont know if this is correct, but I see nothing better, and white has to go for king or go down vs 2 black queens

May-13-16  not not: I missed white needs take with bishop first to eliminate one of the queens and then only play Qe7

it would be my another glorious blitz lose, alas

May-13-16  not not: and I missed Qa3 too, my Qb4 sucks too

damn tactics

May-13-16
Premium Chessgames Member
  Jimfromprovidence: Black could try 34...Qh1, below.


click for larger view

The threat is 35...Qxh2+ 36 Kf1 (other king moves lead to mate in 1) 36...Qh3+, winning the rook.

White parries that threat with 35 Qe3!


click for larger view

May-13-16
Premium Chessgames Member
  kevin86: Black can promote, but white CAN and does WIN.
May-13-16  saturn2: My attempt was 31 Qb4. It does not give away the d pawn and black cannot play c1Q. So after 31...Rd8 or Kg8 the outcome is unclear (to me)
May-13-16  Cheapo by the Dozen: In a silly error, I forgot that White can snap off one of the Black queens.
May-13-16  dfcx: I would like to play

31.d7 Bxd7 32.Qb4+ Kg8 33.Rxd7 c1=Q 34.Bxb1 Qxb1 35.Qe7 wins

Time to check, slightly different sequence

May-13-16  RandomVisitor: If black had tried 25...Qxd2 26.Rxd2 Rc5 he might have stood better:


click for larger view

Komodo-9.42-64bit:

<-0.77/38 27.Bxb7 Rxa5> 28.Nf3 Rd8 29.Ne5 Rc5 30.Rd4 Rc2 31.Nc6 Rd7 32.f5 Rxb7 33.fxe6 fxe6 34.d7 Rxd7 35.Rxd7 Rxc6 36.Kf2 Rc2 37.Rd6 Kf7 38.Rxa6 Rxb2 39.Ra7+ Kf6 40.Rb7 h5 41.Rb5 g6 42.Ke3 Rb1 43.Ke4 Rh1 44.Rxb3 Rxh2 45.e3 Rh1 46.Kf3 Rf1+ 47.Ke4 Rc1 48.Kf3 Ra1 49.Rb7 Rc1 50.Rb5

-0.93/38 27.Rd4 Rd8 28.Kf2 Kf8 29.Bxb7 Rxa5 30.h4 g6 31.Nd3 Rb5 32.Bxa6 Rb6 33.Nc5 Rdxd6 34.Nxe6+ fxe6 35.Rxd6 Rxd6 36.Bc4 Rd2 37.Bxb3 Kf7 38.Bc4 Rxb2 39.Kf3 Kf6 40.g4 Rb4 41.Bd3 Rb3 42.g5+ Kg7 43.Kg4 Rb4 44.Kg3 Rd4 45.Bc2 Rc4 46.Bd3 Rc1 47.Kg4 Ra1 48.Kg3 Ra4 49.Kf3 Rd4 50.Kg3

-1.00/38 27.e4 f6 28.Bf3 Rxa5 29.Kf2 Rc8 30.Ke3 Kf8 31.Bd1 Rd8 32.Nf3 Ke8 33.h4 Rc5 34.Rd3 b6 35.e5 fxe5 36.fxe5 Bc4 37.Rd4 Kd7 38.Rg4 g6 39.h5 Re8 40.hxg6 hxg6 41.Rxg6 b5 42.Rg7+ Kd8 43.Ra7 Rd5 44.Ra8+ Kd7 45.Ra7+ Kc6 46.Rxa6+ Kc5 47.Ra1 Rxd6 48.g4 Rd3+ 49.Ke4 Rd7 50.Ke3 Bd5 51.g5 Bxf3 52.Bxf3 Rxe5+ 53.Kf4 Re6 54.Rc1+ Kb6 55.Be4 Re8 56.Rc6+

May-13-16  RandomVisitor: <al wazir>after 29...bxc2


click for larger view

Komodo-9.42-64bit:

+4.76/31 30.Qa4 Qf1+ 31.Kxf1 c1Q+ 32.Kf2 Rd8 33.Qc2 Qxc2 34.Bxc2 Bd7 35.e4 Rb8 36.Rb4 b5 37.axb6 Bb5 38.Rd4 Kf8 39.e5 Ke8 40.d7+ Bxd7 41.Rd6 Bc8 42.Be4 Ke7 43.b7 Bxb7 44.Rb6 Bxe4 45.Rxb8 a5 46.Ke3 Bc2 47.Rg8 g6 48.Rh8 a4 49.Rxh7 Ke6 50.Kd4 Bb3 51.g4 f6 52.exf6

<0.00/31 30.d7 Bxd7 31.Rxd7 c1Q 32.Bxb1 Qe3+ 33.Kg2 Qxe2+ 34.Kg1 Qe3+ 35.Kg2 Qe2+>

-0.97/31 30.Qc4 Qd1 31.d7 Bxd7 32.Bxc2 Rxe2+ 33.Qxe2 Qxd4+ 34.Ke1 g6 35.Qd3 Qg1+ 36.Kd2 Qxh2+ 37.Kc3 Qh3 38.b3 h5 39.Kb4 Qe6 40.Kc3 Qe1+ 41.Kb2 Be6 42.Qd8+ Kg7 43.Qd4+ Kh7 44.Qc3 Qf2 45.Ka3 Qg2 46.Qc5 Qf3 47.Qe5 Kg8 48.Qb8+ Kg7 49.Qe5+ Kh7 50.Qf6 Qd5 51.Qe5 Qxe5 52.fxe5 Bf5 53.Bd1 Be4 54.Be2 Kh6

May-13-16  RandomVisitor: After 30...Kf8


click for larger view

Komodo-9.42-64bit:

<+9.21/33 31.d7 Bxd7 32.Rxd7 c1Q 33.Qa3+ Kg8 34.Bxb1 Qc6> 35.Re7 Rf8 36.Be4 Qh6 37.h4 b6 38.Bd5 bxa5 39.Bxf7+ Kh8 40.Rb7 Rd8 41.Qxa5 Qd6 42.Qe5 Qf8 43.Bd5 Qf6 44.Qxf6 gxf6 45.Be4 h6 46.Rh7+ Kg8 47.Rxh6 Rd6 48.Rg6+ Kh8 49.Bd3 Rb6 50.b3 Rxb3 51.Rxf6 a5 52.Ra6 Rb7 53.Rxa5 Kg7 54.Ra6 Rb8 55.Kf3 Rc8

-1.21/33 31.Qxc2 Qxc2 32.Bxc2 Rxe2+ 33.Kf1 Rxc2 34.d7 Bxd7 35.Rxd7 Rxb2 36.Rd8+ Ke7 37.Rd4 Ke6 38.h3 g6 39.Ra4 h5 40.Rc4 Rb5 41.Rc7 h4 42.g4 Rb2 43.Kg1 Kf6 44.Rc4 Rb5 45.Rc7 Kg7 46.Kg2 Rxa5 47.Rxb7 Ra2+ 48.Kf3 Ra3+ 49.Kg2 a5 50.Ra7 a4 51.Kf2 Rxh3 52.Rxa4 Rh2+ 53.Kf3 Rb2 54.Ra1

-3.61/33 31.Qa3 Bd7 32.Bxc2 Qxc2 33.Qd3 Qxb2 34.Re4 Rd8 35.Re5 Kg8 36.Qe3 Qb4 37.Qe4 Qxe4 38.Rxe4 Kf8 39.h4 Bc6 40.Rd4 Ke8 41.e4 f6 42.e5 Kf7 43.exf6 Kxf6 44.g4 Ke6 45.Kg3 Bd5 46.Rd1 Rxd6 47.Re1+ Kf7 48.Rd1 Kf6 49.h5 Rd7 50.Re1 Rc7 51.Re5 Rc5 52.Rf5+ Ke7 53.Re5+ Kf7 54.Rf5+ Kg8 55.Re5 Rxa5

May-13-16
Premium Chessgames Member
  morfishine: <31.d7> is the only move from this position
May-13-16  BxChess: It took me quite a while to solve this one. First I looked for a mate. Then I looked for a material advantage. Then it dawned on me what a parlous state white was in, with black threatening mate on two fronts. So then I looked to see if I could even save the game.

The problem was that when I transferred the postion to a physical board, which I do so that I can solve the harder puzzles at my leisure, I inadvertantly left off the d6 pawn:


click for larger view

White to play and win.

May-13-16  RandomVisitor: <BxChess>1.Qa3+ Kg8 2.Qe7! Qf1+ 3.Kxf1 c1Q+ 4.Kf2 Qc8 5.Qxb7 and with no tactical threats for black, white is two pawn up.
May-13-16  stst: A delicate position, either side competes to trap the opponent's K. White's B cannot move, or Rxe2+ supported by its B@g4. White still got just enough time to advance its "passing" P to d7: 31.d7 then if
(A).........c1=Q, 32.dxe8=Q#
(B).........Rd8,
32.Qb4+ Kg8
33.Qe8 Bxd7 or c1=Q
34.QxR#
(C)........Bxd7
32.QxB c1=Q
33.Bxb1 Q(c1)xB
34.Rc4 threatens Rc7 and Qxf3#. Black's Q is not in rescue position.
May-14-16  RandomVisitor: White has the better play after 19.Nxd4 exd4 20.Rxd4


click for larger view

Komodo-9.42-64bit:

+0.85/31 20...Be6 21.Rh4 h6 22.Bxh6 f5 23.Qd2 Rf7 24.Bg5 Qa4 25.Bd5 c3 26.bxc3 bxc3 27.Qd3 Qd7 28.Bxe6 Qxe6 29.Rc4 Re8 30.Be7 Rfxe7 31.dxe7 Qxe7 32.Qxf5 Qxe2 33.Rc7 Qe1+ 34.Kg2 Qe4+ 35.Qxe4 Rxe4 36.Rxc3 Re5 37.Ra3 Kf7 38.f4 Rb5 39.g4 Ke6 40.h4 g6 41.Kf2 Rb2+ 42.Kf3 Rb5 43.Ke3

+0.89/31 20...b3 21.Qxc4 Be6 22.Qb4 Rb8 23.Bd2 f6 24.Bf4 Qd7 25.Qb6 Rfd8 26.h4 h6 27.Bf3 Rdc8 28.h5 Kh7 29.Be4+ Kh8 30.Rb4 Bf7 31.Bf3 Be6 32.Kh2 Bg4 33.Kg2 Be6 34.Kg1 Bg4 35.Bxb7 Rc2 36.Qxa6 Re8 37.f3

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