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Michal Vladimirovich Krasenkow vs Jon Ludvig Hammer
Rilton Cup (2016), Stockholm SWE, rd 6, Jan-02
Queen's Gambit Declined: Ragozin Defense (D38)  ·  0-1
ANALYSIS [x]

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sac: 31...Ra2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-14-17  Walter Glattke: If 32.Nb3 then d3 33.Rd2 Rxb2 wins
decisive material, too.
May-14-17  Walter Glattke: 38.Rd3? Rxf4+ is more for
pupils in school chess. 38.Kf3 Kf5 39.Rd3 black initiative, no Advantage.
May-14-17  Walter Glattke: I have pages from Jan 03 16 and Jan 05 16, but there are other matches. The data Memory seems to have mistakes.
May-14-17
Premium Chessgames Member
  al wazir: I don't see the win after 32. Rbb2.

If 32...d3, then 33. Rxa2 dxc2 34. Rxc2.

If 32...Bxc4, then 33. Rxa2 Bxa2 34. Rxa2.

If 32. Rxb2, then 33. Nxb2 Bxc4 34. Nxc4 d3 35. Rd2 Rd8 36. Nd6.

What am I missing?

May-14-17  Walter Glattke: Of course, 38.Kf3/g3 Kf5! wins.
al wazir, I found 32.Rbb2 Ra3+ 33.Kg2 d3
May-14-17
Premium Chessgames Member
  ChessHigherCat: <al wazir> 32 Rbb2 Ra3+ 33. Kg2 Bxc4 34. Rxc4 Re1 looks won for black
May-14-17  Boomie: Sunday, huh? Something tells me this will be neither easy nor peasy.
May-14-17  mel gibson: I didn't see it but I didn't look for long.

The computer gives only a 1 pawn advantage to black:

31. Bc4 Ra2 (31. .. Ra2
(♖a4-a2 ♖c2-c1 ♗e6xc4) +1.53/22 219)

score for black +1.53 depth 22.

May-14-17
Premium Chessgames Member
  malt: 31...Ra2 nice move!
May-14-17  wooden nickel: A nice mate would occur upon
31... Ra2 32.Rxa2 Bxc4 33.Rab2 Bh4 34.Ra3 Bd5#


click for larger view

May-14-17  Cheapo by the Dozen: I went with the idea of

31 ... d3
32 Rc1 ... d2
33 Rc2 Bxc4
34 Rxc4 Ra1

I didn't see a wholly satisfactory alternative for White.

May-14-17  takchess: It's Hammer time.
May-14-17  Iwer Sonsch: My guess is <31...Bxc4 32.Rxc4 Ra1>:

A) 33.Rd3 Re1 34.Nf2 Bh4

B) 33.Nf2 Rae1

C) 33.Nb2 Rf1 and ...Ree1.

And now Stockfish is going to prove me wrong.

May-14-17  morfishine: I get the most joy out of these Sunday puzzles when I completely miss it and stare in wonder at what was played

*****

May-14-17  Iwer Sonsch: With the improvement of 33.Rd3 Re1 34.Nf2 Ra2! 35.Ne4! Rf1+, my line draws after any response.

The game line is way stronger (-1.37 @depth 25). The reason this is a Sunday puzzle might be the line <33.Rab2 Bh4 34.Ne3 dxe3 35.Rxe3 Bd5+ 36.Ke2 Rf8!


click for larger view

Black is still down in material, but his position is superior enough to be rated -1.83 @depth 29 by Stockfish 7.

The endgame was played inferior by White.

May-14-17  Iwer Sonsch: <Cheapo by the Dozen> 31...d3 <32.Rxd3> (forced) 32...Rxb4 33.Bxe6 Rxe6 (1.22 @depth 24).
May-14-17  Walter Glattke: Cheap of the dozen, right diagram? I think, 31.-d3 32.Rxd3 Rxb4 33.Bxe6 Rxe6 I see just Iwer had the same analysis.
May-14-17
Premium Chessgames Member
  patzer2: Today's Sunday solution is a bolt out of the blue piece sacrifice with 31...Ra2!!, and IMO it truly meets the chessgames.com criteria for an insane level of difficulty.

According to my computer, instead of 32. Rxa2 Bxc4 (-2.00 @ 39 depth, Stockfish 8) White can put up more resistance with 32. Rc1 Bxc4 33. Rxc4 Rh2 to (-1.43 @ 39 depth, Stockfish 8.)

Black's game starts to go down hill after 28. Kf3? allowing 28...Be6! 29. Nd1 Ra4 (-0.76 @ 32 depth, Stockfish 8)

Instead, Black seemingly can keep it near level with 28. b5 Bh4+ 29. Kf1 Bd7 30. Rcd2 Be7 31. Rc2 = (-0.12 @ 36 depth, Stockfish 8)

P.S: Playing out these positions should make for an excellent study of late middle game to endgame transitions. I found myself having to consult a 7-piece endgame table base several times to determine the outcome of some of the resulting endgame positions.

May-14-17  Iwer Sonsch: <patzer2> Indeed. The reason why 32.Rc1 Bxc4 33.Rxc4 Rh2 34.Rb2 Rxb2 35.Nxb2 works for Black is 35...Re3+ 36.Kf2 Bh4+ 37.Kg1 Re1+ 38.Kg2 Re2+ 39.Kf3 Rxb2 40.Rxd4 (-1.46 @depth 29).
May-14-17  1stboard: very nice finish .....

Black was a king ahead .....

May-14-17  bla bla: a nice combination (:
May-14-17
Premium Chessgames Member
  agb2002: I haven't found the time for this interesting puzzle but 31... Ra2 caught my eye since the rook on c2 protects the bishop and Bxc4 could create many problems to White.
May-14-17
Premium Chessgames Member
  ChessHigherCat: My apologies if somebody already discussed this but it seems counterintuitive for black to play 33...Bxb3 and allow gf6+ instead of playing 33...h6xg5. 34. f4xg5 Bxg5 35. Rg2??? Bd5+!
May-14-17  RandomVisitor: After 31...Ra2


click for larger view

Komodo-10.1-64bit: <3 1/2 hours computer time, Selectivity 70>

A Selectivity of 70 performs a more thorough search (default 100).

-1.88/45 32.Rc1 Bxc4 33.Rxc4 Rh2 34.Rb2 Rxb2 35.Nxb2 Re3+ 36.Kf2 Bh4+ 37.Kg1 Re1+ 38.Kg2 Re2+ 39.Kf3 Rxb2 40.Rxd4 Kf8 41.Rd6 Rb3+ 42.Ke2 h5 43.Rh6 Rb2+ 44.Kd3 Rxb4 45.Rxh5 Be7 46.f5 Bxc5 47.Rh7 Rd4+ 48.Ke2 Re4+ 49.Kf3 Re3+ 50.Kf4 Re7 51.Rh8+ Kg7 52.Ra8 Be3+ 53.Kg3 Bd2 54.Rc8 Rd7 55.Kf3 Bg5 56.Ke4 Re7+ 57.Kd4 Bf6+ 58.Kd3 Bh4 59.Kd4 Kf7 60.Kd3 Bg5 61.Rh8 Kg7 62.Rc8 Kf6 63.Rg8

-2.10/45 32.Rxa2 Bxc4 33.Rab2 Bh4 34.Ne3 dxe3 35.Rxe3 Bd5+ 36.Ke2 Rf8 37.b5 Rxf4 38.bxc6 Bxc6 39.Reb3 Rf7 40.Rb1 Bg5 41.Rb4 Re7+ 42.Kd3 Kg6 43.Kc4 Re4+ 44.Kc3 Re3+ 45.Kc4 Bf6 46.R4b3 Re4+ 47.Kd3 Re5 48.Rxb7 Bxb7 49.Rxb7 Rxc5 50.Kd2 Kg5 51.Rb3 Kh4 52.Rf3 Bg5+ 53.Ke2 Rc1 54.Kf2 Rc2+ 55.Kf1 Rh2 56.Rb3 Ra2 57.Rf3 Ra4 58.Rd3 Ra1+ 59.Ke2 Ra2+ 60.Ke1 Rc2 61.Kf1 Rb2 62.Rf3 Rd2 63.Rb3

May-15-17
Premium Chessgames Member
  al wazir: <Walter Glattke: 32.Rbb2 Ra3+ 33.Kg2 d3>. Yes, that works. Thanks.
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