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David Howell vs Jorge Cori
Chess Olympiad (2016), Baku AZE, rd 11, Sep-13
Sicilian Defense: Alapin Variation. General (B22)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
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Sep-20-16
Premium Chessgames Member
  luzhin: Well, Howell could try 28.a5 and if then 28...b5 29.b4 opening up the black squares in the area of Cori's king. Basically almost anything was better than 28.Qf4?? because until then Black couldn't play f5, the move which gives him massive central and K-side control.
Sep-20-16
Premium Chessgames Member
  Paint My Dragon: <luzhin> It's one of those irksome errors that plagues players at all levels. Howell had also played Qf4 on move 24, when Black couldn't reply f5, because of Bxe6 (no Qc6 follow-up available). When you repeat moves, you have to slavishly check that circumstances haven't changed, or the outdated analysis, still fresh in your mind, will misinform you.

As you say - a costly mistake. Fourth to ninth was superficially the difference between a positive and slightly negative team result.

Oct-24-19
Premium Chessgames Member
  ajk68: <turning a significant plus for White>

Not really a significant plus. It was about even. The material advantage was offset by positional factors.

Oct-24-19  drollere: black threatens Qg2# if the white Q can be dislodged. N:h4 threatens Nf3+ forking the Q. the Q cannot retreat to 33. Qc2 (Qh1+, 34. Kf2 Qg2+, 35. Ke3 Qf3#) or 33. Qe2 (Qh1+, 34. Kf2 Qg2+, 35. Ke3 Qg1+ 36. Qf2 Ng2+, 37. Ke2 Bf3+). so 33. g:h4 R:h4 and the exchange sacrifice Qg3 seems plausible ... until Rd2 removes the defending N and the Q is free to munch Kside and trade p for R.
Oct-24-19  Walter Glattke: Black wins a rook and two pawns for a knight; also with 34.-Rd3 35.Ne3 Rh1+ 36.Kf2 Rd2+ 37.Re2 Rxe2+ 38.Kxe2 Rxc1 - black should win, too, with 33.-Rxh4 34.gxh4 Rh8 or 34.-Nxh4.
Oct-24-19  Walter Glattke: No, 32.-Rxh4 33.gxh4 Rh8 or 34.-Nxh4 one move earlier.
Oct-24-19  Walter Glattke: 32.-Rxh4 33.gxh4 Nxh4
Oct-24-19  Cheapo by the Dozen: Rarely is a Thursday puzzle this easy (for me). That said, I only calculated to the point that I saw Black would get at least a little material advantage plus an ongoing attack; I didn't actually check that best play yields a lot more than that, which turns out to be the engine's opinion of the case.

Black's main threat is mate along the long diagonal. To enforce it he needs to displace White's queen with tempo. Fortunately, in lines where White unprotects h1 but keeps g2 covered, Black prevails in the ensuing king hunt, due to the open d-file. Also fortunately, 32 ... Nxh4 threatens a triple fork, which wins advantageous material no matter what.

Oct-24-19  AlicesKnight: Found the correct break-in and the importance of the d-file. The process of denuding the white K starts effectively with the P-sacrifice from 22.... Nf4 and layer by layer the scenario opens up.
Oct-24-19  saturn2: I only looked at
32...Nxf4 (threatening Nh3 and Nd3) 33. gxf4 Rxh4
Oct-24-19  stacase: 34...Rh3 I would have moved 34...Qh1+ followed by 35.Kf2(forced) then 35...Rh3 and what's the White Queen going to do? If White moves his Knight* discovering an attack on Black's Queen then Black's Rook says Check 36...H2+

....

*After playing it out a little 36.Ne3 seems to work out for White coming out of it with a Knight up advantage.

Oct-24-19  mel gibson: The en passant looked good to me but
Stockfish 10 agreed with the actual game.
Mate in 27:

32... Nxh4

(32. .. Nxh4 (♘g6xh4 g3xh4 g4-g3 ♘f1xg3 ♖h8xh4 ♖e1-d1 ♖d8xd1+ ♖c1xd1 ♖h4xh2 ♗a2-d5 ♕c6xa4 ♗d5xb7+ ♔a8xb7 ♔g1xh2 ♕a4xd1 ♔h2-g2 ♕d1-g4 b2-b3 ♕g4xf4 ♘g3-e2 ♕f4xe5 ♔g2-f3 ♕e5-e4+ ♔f3-f2 f5-f4 b3-b4 c5xb4 c3xb4 f4-f3 ♘e2-g1 ♕e4-d4+ ♔f2xf3 ♕d4xg1 ♔f3-e2 ♕g1-g4+ ♔e2-d2 ♕g4xb4+ ♔d2-d3 ♔b7-c6 ♔d3-e3 ♔c6-d5 ♔e3-f2 ♕b4-e4 ♔f2-f1 ♔d5-d4 ♔f1-f2 ♕e4-g4 ♔f2-e1 ♔d4-e3 ♔e1-f1 ♕g4-g6 ♔f1-e1 ♕g6-b1+) +M27/51 650)

Oct-24-19
Premium Chessgames Member
  agb2002: Black is one pawn down.

Black can start an attack against the white king with 32... Nxh4:

A) 33.gxh4 g3

A.1) 34.Nxg3 Rxh4

A.1.a) 35.Qxh4 Qg2#.

A.1.b) 35.Qc2 Rh1+ 36.Nxh1 (36.Kf2 Qf3#) 36... Qxh1+ 37.Kf2 Qg2+ 38.Ke3 Qf3#.

A.1.c) 35.Qe2 Rh1+ 36.Nxh1 (36.Kg2 Qg2+ 37.Ke3 Qxg3+ 38.Qf3 Qxf3#) 36... Qxh1+ 37.Kf2 Qg2+ 38.Ke3 Qg3+ 39.Qf3 Qxf3#.

A.1.d) 35.Qf2 Rh1+ 36.Nxh1 Qxh1#.

A.2) 34.Qxg3 Rhg8

A.2.a) 35.Re3 Rxg3+ 36.Rxg3 (36.Nxg3 Qg2#) 36... Qh1+ 37.Kf2 Rd2+ 38.Nxd2 (38.Ke3 Rxb2 39.Bb1 Rxb1 40.Rxb1 Qe4+ wins decisive material) 38... Qh2+ 39.Kf1 (else wins the rook on g3 with check) 39... Qxg3 looks winning.(40.Bxe6 Qxf4+ 41.Ke1 Qxe5).

A.2.b) 35.Qxg8+ Rxg8+ 36.Kf2 (36.Kh2 Qg2#) 36... Rg2+ 37.Ke3 Qe4#.

A.3) 34.Qh3 Rxh4 35.Qxg3 Rg4, threatening 36... Qg2+ and mate soon, looks similar to A.2.

B) 33.Nd2 Rxd2 wins decisive material (34.Qxd2 Nf6+).

Oct-24-19
Premium Chessgames Member
  keypusher:


click for larger view

Incidentally, Cori's 30....Qc6 was very strong, but SF comes up with the attractive 30....g3! (31.Nxg3 Nxe5 32.Rc2 c4 33.Rce2 Nd3 34.Rf1 Nf4, or 31.fxg3 c4 32.Rcd1 Nxe5 33.Rxd8+ Rxd8 34.Ne3 Rd2, or 31.Qxg3 and now either ...Nf4 or ...f4 is crushing.)

Really a nice attack by Jorge Cori.

Oct-24-19
Premium Chessgames Member
  patzer2: Easy Thursday puzzle (32...?) because there are multiple winning moves. Stockfish 10 indicates there are at least ten winning alternatives. So it's difficult to find a move that doesn't work.

My attempt was 32...Nxf4 -+ (-15.06 @ 30 ply, Stockfish 10) which is nearly as good as the game continuation and best move 32...Nxh4 -+ (-15.52 @ 30 ply, Stockfish 10).

If you realize White just played 32. f4, also good is 32...gxf3 -+ (-13.09 @ 30 ply, Stockfish 10).

P.S.: White's decisive error was 28. Qf4?, allowing 28...f5! -+ (-3.68 @ 25 ply, Stockfish 10).

Instead, White can hold with advantage by getting the Bishop back in play with 28. Bc4 ⩲ (+0.74 @ 35 ply, Stockfish 10).

Oct-24-19  TheaN: What are Black's strengths, the diagonal and the king side pressure so <32....Nxh4>. Sometimes positions do solve themselves. This questions mostly f3 as both the knight (with disaster) and the queen (with attack) can come here with dire consequences. In fact, because Nf3+ is check, White is pretty much forced to play <33.gxh4 Rxh4>.

It's done: <34.Qg3> any other square for the queen is pointless (need at least tabs on g2, and after 34.Qe2 Rh1+ 35.Kf2 Qg2+ 36.Ke3 Rh3+ #3 the dark squares don't help), and now the relatively prosaic <34....Rh3 -+> decides, as R+N:Q is now forced. Specifically, 35.Qxh3 gxh3 -+ is terrible, and Black delivers a disorienting black out after 35.Re3 Rxg3+ 36.Rxg3 (where White may think he has somewhat of a playable position) Rd2! -+.

Oct-24-19  King.Arthur.Brazil: I found the combination except for 36...♖d2+ where I followed with 36... ♖h8 with two options: (I guess that White resigns too) _A: 37. ♖d1 ♖h1+ 38. ♔f2 ♕e4 39. ♖d8+ ♔a7 40. ♖dd3 ♕xf4+ 41. ♔e2 ♗f3+ 42. ♔f2 ♖xf1+ 43. ♔xf1 ♕xg3 44. ♖d2 ♕xe5 or _B: the long road: 37. ♗c4 ♖h1+ 38. ♔f2 ♕e4 39. ♗xe6 ♕xf4+ 40. ♔e2, see diagram. Next: ♖xf1 41. ♖xf1 ♕xg3 with some lines: __a) 42. ♖xf5 ♗e4 43. ♖f8+ (trying endless checks) ♔b7 44. ♖f7+ ♔b8 45. ♖f8+ ♔c7 46. ♖c8+ ♔b7 47. ♖e8 (end of checks) ♕d3+ 48. ♔e1 ♕e3+ 49. ♔d1 ♗d3 (With the threat: 50...♕e2+ 51.♔c1 ♕c2#. White must loose the ♖) 50. ♖e7+ ♔b8 51. ♖e8+ ♔c7 52. ♗b3 ♕e2+ 53. ♔c1 ♕e1+ 54. ♗d1 ♕e3# __b) 42. ♖xf5 ♗e4 43. ♖f8+ ♔b7 44. ♖f7+ ♔b8 45. ♗c4 ♕xe5 46. ♖f8+ ♔c7 7. ♖g8 ♗d5+ ...(there is no way to avoid loose the ♗ or the ♖ or fall into a check-mate) __c) 42. ♗xf5 ♗f3+ 43. ♔d2 ♕g2+ 44. ♔e3 ♕xf1... __d) 42. ♗xf5 ♗f3+ 43. ♔d3 ♕e2# __e) 42. ♗xf5 ♗f3+ 43. ♔e3 ♕xf1 easy win. Seems that 36.♖d2 is quicker and solve the problem.

Diagram with black view after 40. ♔e2:


click for larger view

Oct-24-19
Premium Chessgames Member
  saffuna: Does 32...Nxf4 work as well?
Oct-24-19  HorsePlay: <stacase> after 36 Ne3 Rh2 What moves did you work out??
34...Qh1+ 35. Kf2 Rh3 36. Ne3 Rh2+ ??
Oct-24-19  Diana Fernanda: We want see game of Wang Hao, not of player unknow or nivel down. Thanks CG
Oct-24-19  saturn2: <saffuna> Patzer2 has answered your question confirming what was also my try. Just read.
Oct-24-19
Premium Chessgames Member
  beatgiant: My attempt was <32...Rxh4> 33. gxh4 Nxf4, which also looks like a quick win, but the computer analysis shows that White can hang on for a while with <34. Bd5> (which I missed) Qxd5 35. Red1.
Oct-24-19  TheaN: <Diana Fernanda: We want see game of Wang Hao, not of player unknow or nivel down. Thanks CG>

Toning down my reply a bit as I think there's a language barrier, but this is definitely not between <unknown> players (Howell and Cori are both super GMs) and not every PotD can be of amazing quality. Bit less ignorance, please.

Oct-24-19
Premium Chessgames Member
  Breunor: I thought Nxh4 is better then Nxf4 because white can't easily choose to ignore the knight on h4 with the threat of Nf3 check forking everything.

Of course both win.

Oct-24-19  mel gibson: < Breunor: I thought Nxh4 is better then Nxf4 because white can't easily choose to ignore the knight on h4 with the threat of Nf3 check forking everything.

Of course both win.>

even en passant wins.

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