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Rustam Kasimdzhanov vs Ivan Cheparinov
FIDE Jermuk Grand Prix (2009), Jermuk ARM, rd 9, Aug-18
Semi-Slav Defense: Stoltz Variation (D45)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Aug-18-09  Ulhumbrus: 37 h5! is the move which overcomes the defence.

After 37 h5 the Black King can't take the h pawn as he is tied to the defence of the N on g7, and 37...gxh5 invites 38 Nf7+ when Black must give up a Rook for the N.

Aug-19-09  pulsar: 25...Ng3 looks interesting, if not messy:


click for larger view

Aug-19-09  Bons92: <pulsar> I don't think 25...Ng3 is so interesting. After 26.Bxf6+ Kxf6 27.hxg3!(not 27.Qxg3?? because 27...Qh1+ wins)Rxh3 28.Rxd5 Rxg3+ 29.Kf2 or 27...Qh1+ 28.Qxh1 Rxh1+ 29.Kf2 Rh2+ 30.Ke1 Rh1+ 31.Bf1
Aug-19-09  pulsar: <Bons92> Thank you for the lines. I didn't give lines in my earlier post because I didn't have enough time to analyze the position after 25...Ng3.

Looks like you gave an outright refutation. :)

Aug-19-09  outplayer: 17.g4 is a move i have seen sometimes in blitz games. i've never thought i would see this move in GM game.
Aug-19-09  JohnBoy: Certainly giving up a rook (wtih check) on ...40 was not the best. I prefer 39...Rxf7 40.gf7 a2 as a survival attempt.
Aug-19-09  Hidden Skillz: <JohnBoy> your line leads to mate or the loss of a knight. in any case, black is totally lost. unless i am missing something, i thought 40...Rg8 was the best try.
Aug-19-09  JohnBoy: <Hidden> - yeah, I suppose so. But let's be specific. 39...Rxf7 40.gf7 a2 41.Rd6+ and black is faced with an unpleasant choice:

either 41...Kh5 42.Be2+ Kh4 43.Rh6+ Nh5 44.Rxh5#,

or 41...Ne6 42.Re6+ Kg7 43.Re8 - and either the rooks come off and white queens first with a knight to the good and a mating attack, OR black queens and then white queens with check - and a mate soon to follow.

You are right.

BUT 40...Rg8 41.Be2+ Kh6 (41...Kh4 42.Rd1) 42.Ng4+ gets back the X and will pick up a black q-side pawn. White holds all the cards at move 39.

Aug-19-09
Premium Chessgames Member
  Peligroso Patzer: <JohnBoy: Certainly giving up a rook (wtih check) on ...40 was not the best. I prefer <39...Rxf7 40.gf7 a2> as a survival attempt.>

By moves 39 and 40, it really did not make much difference what Black played. For example, if (as suggested) 39...Rxf7 40.gxf7 a2 then White wins as follows: 41.Rd6+ Ne6 (41...Kh5 42.Be2+ Kh4 43.Rh6+ and MATE NEXT.) 42.Rxe6+ Kg7 (42...Kh5 43.Be2+ and MATE NEXT.) 43.Re8 Kxf7 (43...a1=Q 44.f8=Q#) 44.Rxa8 ]

Jun-15-19
Premium Chessgames Member
  agb2002: White is a pawn down.

Black threatens Bxc3 followed by Nxf4.

White has Ra1 followed by Ra3 to deflect the black queen from e6, Rd7 to pin Black's f-pawn, Nxe6+ to open the seventh rank, Nxf7 with the same idea and Bxh5 followed by Bxf6+ and Rd7.

The problem with 26.Nxe6+ is that after 26... Kg8 Black has more threats.

The maneuver 26.Ra1 Qb3 27.Ra3 doesn't seem to achieve anything.

26.Bxh5 is met with 26... Bxc3 with the threats Qxb2 and Rxh5.

In the case of 26.Rd7 Bxc3 27.Rxf7+ Kg8 28.Rxb7 Nxf4 looks problematic.

In the case of 26.Nxf7 Kxf7 27.Rd7+ Kg8 (27... Kf8 28.Bxf6 wins) 28.Qg4 Rh6 29.Rxb7 looks very good for White.

Jun-16-19  Jamboree: I thought the whole point was supposed to be 26. Qxe6!?!?, leading to all sorts of bizarre complications -- but I couldn't quite keep all the dizzying tactics straight. Then I looked at the game and that's not what was played at all. Instead, white went 26. Rd7, which merely PREPARES Qx6 the next move. But as I feared, stalling for a move seems to let black gather himself together just in time to maintain a playable game for many more moves. The game line doesn't really emerge as a clear win for white until much later. So I thought white had to strike instantly with 26. Qxe6. But I couldn't grasp a win after 26.... fxe6 27 Rd7+ Kf8...and now what? Either 28. Bxf5 or 28. Bxf6 leads to a hugely lopsided position, but does black always find a way to survive? Seems so.

But the game line isn't satisfying either, and leads to a murky game as well. Is there some obvious crush that neither I nor the players saw?

Jun-16-19  patzer2: The solution to today's Sunday puzzle is not the game continuation 26. Rd7 = (0.00 @ 38 ply, Stockfish 10), which is only good for equality. Instead, White secures a winning advantage with the demolition 26. Nxf7! Kxf7 27. Rd7+ +- (+2.21 @ 38 ply, Stockfish 10).

P.S.: So where did Black go wrong? Black's game was going well until the poison pawn capture 22...Qxc5? 23. Rac1 +- (+1.92 @ 27 ply, Stockfish 10).

Instead, 22...Rh8 ⩱ (-0.28 @ 30 ply, Stockfish 10) would have kept the game level or better for Black.

After White missed the winning move 26. Nxf7! +-, Black had another opportunity to equalize in the follow-up after 26. Rd7 =.

Instead of 31...Re8 32. Ng5 ± (+0.71 @ 27 ply, Stockfish 10), Black could've maintained equality with 31...Rc2 = (0.00 @ 30 ply, Stockfish 10).

Jun-16-19  goodevans: My first correct Sunday solution for a few weeks!

As <patzer2> says, it's not the game continuation that yields an advantage but <26.Nxf7 Kxf7 27.Rd7+>. Now the only move that doesn't lose heavily is <27...Kg8>.


click for larger view

White's next move is crucial. 28.Rxb7 is met by 28...Nxf4 so white must play the clever intermezzo <28.Qg4> (threatening 29.Qxg6+) before taking the B next move.

We also need to consider that 26.Nxf7 could be met with the immediate <26...Nxf4>. This is best met with <27.Bxf6+> and whichever piece black takes he succumbs to the same nasty pin.


click for larger view

27...Kxf6 28.Qf1

27...Kxf7 28.Rc7+ Kxf6 29.Qf1

Jun-16-19  mel gibson: As per< Patzer2
Instead, White secures a winning advantage with the demolition 26. Nxf7! Kxf7 27. Rd7+ +- (+2.21 @ 38 ply, Stockfish 10)..>

Stockfish 10 chooses a different move.

26. Nxf7

(26. Nxf7 (♘g5xf7 ♔g7xf7 ♖d1-d7+ ♔f7-g8 ♕h3-g4 ♖h8-h6 ♖d7xb7 ♖a8-c8 ♖b7-a7 ♕a2-d5 ♖a7xa6 ♗f6xc3 b2xc3 ♘h5-g7 ♖c1-d1 ♕d5-e4 ♕g4-f3 ♕e4xf3 ♗e2xf3 ♖c8-c7 ♖d1-d8+ ♔g8-f7 ♖a6-b6 ♖c7-a7 ♗f3-g4 ♘g7-f5 e3-e4 ♖a7-a1+ ♖d8-d1 ♖a1xd1+ ♗g4xd1 ♘f5-e3 ♗d1-e2 e6-e5 f4-f5 ♘e3-c4 ♖b6-b7+ ♔f7-g8 ♖b7xb5 ♘c4-d2 ♖b5xe5 ♖h6-h4 f5xg6 ♖h4xe4 ♖e5xe4 ♘d2xe4 h2-h4 ♘e4xc3 ♗e2-c4+ ♔g8-g7 h4-h5 ♘c3-e4) +2.18/41 338)

score for White +2.18 depth 41

By move 40 in the game 40...Rxg6 it's mate in 8, Black has lost.

40. Ne5 Rxg6
41. Bxg6+

(41. Bxg6+ (♗d3xg6+ ♔h5-h6 ♗g6-d3
♖a8-g8 ♘e5-g4+ ♔h6-h5 ♘g4-f6+ ♔h5-h4 ♘f6xg8 ♘g7-h5 ♗d3-e2 a3xb2 ♖d7-h7 b2-b1♕ ♖h7xh5+) +M8/74 9)

Jun-16-19
Premium Chessgames Member
  master8ch: 26.Bc4 looks interesting....and complicated.
Jun-16-19  patzer2: <agb2002><The problem with 26.Nxe6+ is that after 26... Kg8 Black has more threats.> Indeed, 26. Nxe6? is a mistake, allowing Black to turn the tables and win with 26...Kg8! -+ (-2.91 @ 38 ply, Stockfish 10).

After 26. Nxe6?, Black's only good move is 26...Kg8! If 26. Nxe6? fxe6?, White secures a strong, near winning advantage with 27. Rd7+ +- (+1.47 @ 38 ply, Stockfish 10).

Jun-16-19  cormier:


click for larger view

Analysis by Houdini 4 d 22 dpa done

1. = (0.00): 22...Bxb2 23.Rac1 Bd5 24.Bxh5 Rh8 25.Qf2 Rxh5 26.Ba5 Qxa5 27.Qxb2+ Kg8 28.Rc2 Qc7 29.Qf6 Rf8 30.c6 Qb6 31.Qd4 Qc7 32.Ne4 Bxe4 33.Qxe4 Rd8 34.Rxd8+ Qxd8 35.c7 Qd1+ 36.Kg2 Qg4+ 37.Kf1 Qd1+ 38.Kg2 Qg4+

2. = (0.00): 22...Rh8 23.Rac1 Rac8 24.Bc3 Bxc3 25.Rxc3 Nf6 26.Qf2 b4 27.Rc2 Qe7 28.Rdc1 Ne4 29.Nxe4 Bxe4 30.Rc4 Bd5 31.R4c2 Be4 32.Rc4

Jun-16-19  devere: It's interesting what a bad move the plausible looking 26.Nxe6+? is and what a good move 26.Nxf7! is. This is a very good Sunday problem.
Jun-17-19  R4f43l L3 M4550n: Hard puzzle! Since Black is threatening 26...Nxf4 discovering check at the Queen, 26.Rd7 is very coherent. My bad is to assesses this as better for white, but just equalizing matters.
Aug-04-19
Premium Chessgames Member
  al wazir: 39...Rxf7 40. gxf7 a2, and now if 41. Rd6+, then 41...Ne6!

After 42. Rxe6+ Kf7, there is nothing better than 43. Rf6+ Kxe7 44. Rf1 a1=Q 45. Rxa1 Rxa1, and white has a long slog to avoid a draw:

46. Bc4+ Kf6 47. b3 Rc1 48. Ke2 (48. Kf3/e4 Rxc4) Rc3 49. e4 Ke7 50. e5 Kf8 51. f5 Ke7 52. f6+ Kf8 53. e6 Ke8 54. Bb5+ Kf8 55. e7+ Kf7 56. e8=Q+.

Aug-04-19
Premium Chessgames Member
  agb2002: Recycled.
Aug-04-19  goodevans: I recognised this instantly. Having spent so much time analysing it last time around I'd have been gobsmacked if I hadn't.

My post from last time around gives an analysis of the correct winning line which is <not what was played in the game>.

Aug-04-19  hcgflynn: 31. - Re8 seems way too passive.
Aug-04-19  RandomVisitor: After 26.Nxf7 Kxf7 27.Rd7+ Kg8 28.Qg4 Rh6 29.Rxb7 material is even but white is (apparently) winning:


click for larger view

Stockfish_19062709_x64_modern:

<60/127 6:28:05 +2.42 29...Rc8 30.Qg2 Rxc3 31.bxc3> Qd2 32.Rd1 Qxe3+ 33.Qf2 Qxf2+ 34.Kxf2 Ng7 35.Bg4 Rxh2+ 36.Kf3 Rc2 37.Rd6 Rxc3+ 38.Ke2 Rc2+ 39.Kd3 Rc8 40.Bxe6+ Nxe6 41.Rxe6 Rf8 42.Rxa6 Rf7 43.Rxf7 Kxf7 44.Rb6 Bd8 45.Rxb5 Ke6 46.Ke3 Bf6 47.Rb7 Bc3 48.Rb6+ Kf7 49.Kd3 Bf6

59/92 6:28:05 +3.08 29...Bxc3 30.Rxc3 Qb1+ 31.Kg2 Qf5 32.Qg5 Rh7 33.Qxf5 exf5 34.Rb6 Rg7 35.Rcc6 Rd8 36.Rxg6 Rd2 37.Kf3 Rxg6 38.Rxg6+ Kf7 39.Rxa6 Rxb2 40.Ra5 Kg6 41.Rxb5 Rd2 42.Rb1 Rd6 43.h4 Ng7 44.Rb5 Nh5 45.Bc4 Ng7 46.Rb8 Rc6 47.Bb3 Rf6 48.Rc8 Rd6 49.Rc5 Rb6

Aug-04-19  RandomVisitor: After 22.Bd2 black can play 22...Rh8 instead of immediately taking the c5 pawn


click for larger view

Stockfish_19062709_x64_modern:

<43/67 08:49 0.00 22...Rh8 23.Qf2 Qxc5> 24.Rac1 Qe7 25.h4 Rac8 26.Rxc8 Rxc8 27.Bxh5 gxh5 28.Qe2 Bxg5 29.hxg5 b4 30.a3 e5 31.Bxb4 Qe6 32.Bc3 Qh3 33.Rd6 Kg8 34.Qd2 Qh1+ 35.Kf2 Qf3+ 36.Ke1 exf4 37.exf4 Qh1+ 38.Kf2 Qg2+ 39.Ke1 Qh1+

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