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Alexander Motylev vs Bu Xiangzhi
2nd Sanjin Hotel Cup (2005), Tiayuan CHN, rd 11, Jul-20
Sicilian Defense: Najdorf Variation (B90)  ·  0-1

ANALYSIS [x]

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sac: 28...Qf5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-28-20  vpandzharov: 31. Qg2 Be5 32. Qc2 and?!
Mar-28-20
Premium Chessgames Member
  Dionysius1: Hi <vpandzharov> and welcome to the kibitzer community. If 31.Qb2 then 31...Rc8 looks better than 31...Be5
Mar-28-20  Brenin: A great counter-attack by Xiangzhi. White had a good position until 18 Nxf4; much better was 18 g6 first, and if fxg then 19 Nxf4, appreciatively eyeing the now weakened square g6. Also too greedy was 22 Qxb4, when it was time for the bishop to wake up and join in.
Mar-28-20
Premium Chessgames Member
  chrisowen: Hammerite vintforge one lump or two kick bucket iron fist?
Mar-28-20  RandomVisitor: A final look at the top 5 responses to 28...Qf5:


click for larger view

Stockfish_20032617_x64_modern:

<49/91 8:16:24 -3.55 29.Rxh3 gxh3 30.Qh2 Rb8 31.Qxh3> Qxd5+ 32.Qd3 Qxb3+ 33.Qc2 Qb6 34.Qd2 d5 35.Bd3 g6 36.Kc1 g5 37.Ra2 g4 38.Qg2 Qe3+ 39.Kc2 g3 40.Rxa5 Qxf4 41.Bf1 Be5 42.Ra3 Kg7 43.Rb3 Rh8 44.Rb4 d4 45.Kb3 Rh2 46.Qd5 Rd2 47.Bh3 Qf6 48.Rb5 Bf4

49/80 8:16:24 -7.93 29.Rh2 Rxh2 30.Qxh2 g5 31.Kd2 Re8 32.Bd3 Qxf4+ 33.Qxf4 gxf4 34.Re1 Rb8 35.Rf1 Bg5 36.Be4 Rxb3 37.Kc2 Rb8 38.Rh1 Kg7 39.Rg1 g3 40.b3 Bf6 41.c4 Be5 42.c5 dxc5 43.Rd1 a4 44.bxa4 Rb2+ 45.Kc1 Re2 46.Bh1 Bd6 47.a5 g2 48.Bxg2 Rxg2

49/79 8:16:24 -11.12 29.Bxh3 Qd3+ 30.Kc1 Bxc3 31.Qd1 Bd2+ 32.Qxd2 Rc8+ 33.Qc3 Rxc3+ 34.bxc3 Qxc3+ 35.Kb1 Qxb3+ 36.Kc1 gxh3 37.Kd2 Qxd5+ 38.Kc3 a4 39.Rhf1 Qb3+ 40.Kd4 g6 41.Rab1 Qc2 42.f5 gxf5 43.Rfc1 Qe4+ 44.Kc3 f4 45.Re1 Qc6+ 46.Kd4 h2 47.Kd3 Qd5+ 48.Kc3 f3

48/69 8:16:24 -11.93 29.Bc4 Qxf4 30.Qf1 Rf3 31.Qe2 g6 32.Qd2 Qf5 33.Qc2 Rf2 34.Qxf5 gxf5 35.Rg1 Rxb2 36.Bd3 Bxc3 37.Bxf5 Rd2+ 38.Kc1 Rf2 39.Ra4 Rxf5 40.Raxg4 Re8 41.Rg8+ Ke7 42.Rxe8+ Kxe8 43.Kc2 Rf3 44.Rh1 Bb4 45.Rh5 Ke7 46.Rh4 Rc3+ 47.Kb1 f5 48.Rf4 Kf6

48/95 8:16:24 -13.23 29.Qg2 Rxh1 30.Qxh1 g5 31.Qh6+ Kg8 32.Qh2 gxf4 33.Qc2 Qxd5+ 34.Qd3 Qxb3+ 35.Qc2 Qe6 36.Qe2 Be5 37.Qb5 f3 38.Kc2 Rc8 39.Qb3 d5 40.Re1 g3 41.Kb1 Kg7 42.Qd1 f2 43.Rxe5 Qxe5 44.Qg4+ Kf6 45.Ka2 Rh8 46.c4 Rb8 47.b3 a4 48.b4 Rxb4

Mar-28-20
Premium Chessgames Member
  chrisowen: Got into this mess my life?
Mar-28-20
Premium Chessgames Member
  takchess: If 31.... pxc3<it's mate in 11. A good test for a patzer like me to see if I could solve from that position .
Mar-28-20
Premium Chessgames Member
  dorsnikov: I couldn't even come close to the correct first move. Players like me do complete injustice to the game of chess. It's like asking a blacksmith to write Shakespear.
Mar-28-20  lentil: Balls of steel!
Mar-28-20
Premium Chessgames Member
  chrisowen: Boster no?
Mar-28-20
Premium Chessgames Member
  chrisowen: Cat on a hot tin roof!
Mar-28-20
Premium Chessgames Member
  chrisowen: I remember palms up no?
Mar-28-20  goodevans: <al wazir: [...] Bur what happens after 32. Qc2 ? If 32...Bxf4+ 33. Kb1 Qxc2+ 34. Kxc2 gxh3 35. Rxh3, Black has ♗+♙ vs. ♖. The position looks competitive. Am I missing something else?>

No, I don't you've missed anything. I couldn't see anything special for black after 31.Qg2 Be5 32.Qc2 so I looked an alternative to <goldfarbdj>'s 31...Be5.

The very first move I looked at was <31...Rc8>. Black's already down a rook so why not sac some more!

I may have found 31...Rc8 very quickly but proving it works took much more effort. If white accepts the sac it takes several moves before the win becomes clear:

31.Qg2 Rc8 32.bxc3 Rxc3+ 33.Kb2 Rxb3+ 34.Kc1 Qc3+ 35.Qc2 Qxa1+ 36.Kd2 Qd4+ 37.Ke1 Re3+ 38.Kf1 Qxf4+ and black will win White's Q.

The win is much easier if white declines the sac, e.g.:

31.Qg2 Rc8 32.Bxg4 Bd2+ 33.Kd1 Bb4+ 34.Qd2 Qxd2#

Mar-28-20
Premium Chessgames Member
  thegoodanarchist: Not really a puzzle.
Mar-28-20  RandomVisitor: White might have tried 27.Bd3 and gambled that black would not find the Qd7-a7-e3 trick move:


click for larger view

Stockfish_20032617_x64_modern:

<59/93 2:56:40 -0.57 27...Qa7 28.b4 a4 29.Bb5 Qe3> 30.Qxe3 Rxh1+ 31.Qe1 Rxe1+ 32.Kxe1 a3 33.Rxa3 Rxa3 34.bxa3 Bxc3+ 35.Ke2 f5 36.Kd3 Bb2 37.a4 Ba3 38.Kc3 Bc1 39.Bd3 g3 40.Bf1 Bxf4 41.a5 Be3 42.Kd3 Bf2 43.Ke2 g5 44.Kf3 Be1 45.a6 Bf2 46.Kg2 Kg7

59/84 2:56:40 0.00 27...Rxh1 28.Qxh1 g6 29.f5 gxf5 30.Kc2 Bg7 31.Qh5 a4 32.bxa4 Rxa4 33.Rf1 f4 34.Re1 f3 35.Qh4 f2 36.Qxf2 Be5 37.Qh4 g3 38.Qh6+ Bg7 39.Qe3 Rg4 40.Ra1 Qe8 41.Qf3 Ra4 42.Rf1 Ra7 43.Qxg3 Qa4+ 44.Kb1 Qa1+ 45.Kc2 Qa4+

Mar-28-20
Premium Chessgames Member
  chrisowen: Oh yes um I have filled with fear wrong?
Mar-28-20
Premium Chessgames Member
  chrisowen: Hmm mack.
Mar-28-20
Premium Chessgames Member
  chrisowen: Felix
Mar-28-20
Premium Chessgames Member
  agb2002: White threatens Bxh3.

The first idea that comes to mind is 28... Qf5, threatening Qxd5+:

A) 29.Bxh3 Qd3+ 30.Kc1 (30.Ke1 Bh4+ 31.Qf2 Re8#) 30... Bxc3

A.1) 31.bxc3 Qxc3+

A.1.a) 32.Kb1 Qxb3+ 33.Kc1 Rc8+ 34.Kd2 Rc2+ and mate in three.

A.1.b) 32.Kd1 Qxa1+ 33.Kd2 Qxg1 34.Rxg1 gxh3 - + [2p].

A.2) 31.Rh2 Bd4, with the triple threat Rc8+, Bxg1 and Be3+, looks winning.

A.3) 31.Qd1 Bd2+ 32.Qxd2 Rc8+ 33.Kd1 Qf3+ 34.Qe2 (34.Ke1 Re8+ wins) 34... Qxh1+ 35.Bf1 (35.Qf1 Qxh3 with a won ending) 35... Re8 (35... Qxd5+ 36.Qd3, unclear) 36.Qd3 g3 37.Kd2 g2 wins decisive material.

A.4) 31.Qg(h)2 Bd2+ 32.Qxd2 (32.Kd1 Bxf4+ 33.Ke1 Bg3+ wins) 32... Rc8+ transposes to A.3.

B) 29.Rxh3 gxh3, with the double threat Qxf4 and Qxd5+, looks very good for Black.

Mar-28-20
Premium Chessgames Member
  agb2002: I missed the final intermediate move. After 35... Re8 White has the winning 36.Qg2. Better luck next time.
Mar-28-20
Premium Chessgames Member
  chrisowen: Revelations?
Mar-28-20
Premium Chessgames Member
  chrisowen: John eleven!
Mar-28-20
Premium Chessgames Member
  al wazir: <goodevans>: Thanks!

If this puzzle is only "very difficult," I don't think I can deal with "insane."

Mar-28-20  RandomVisitor: If 15.gxh6 white is on the right track:


click for larger view

Stockfish_20032617_x64_modern:

<59/83 9:30:46 +1.24 15...Rxh6 16.0-0-0 Qc7> 17.Kb1 Nc5 18.Qxb4 Nxb3 19.axb3 d5 20.Qa4+ Bd7 21.Qa2 Rc8 22.Rc1 d4 23.Bxf4 exf4 24.Nf5 Bxf5 25.exf5 Kf8 26.Bd3 Bxh4 27.Qa4 Qd6 28.Rcg1 Rc7 29.Rh2 Re7 30.Re2 Re3 31.Rd1 Bf6 32.Rf2 Re7 33.Rff1 Bh4 34.Rh1 Re8

Mar-29-20  RandomVisitor: After 21...Nf6


click for larger view

Stockfish_20032617_x64_modern:

<61/92 7:59:46 -0.51 22.Kc1 Rh6 23.Nxf6> Qxf6 24.Bg2 Rc8 25.Ra5 Bg3 26.Rf1 Rh2 27.Rf5 Qe7 28.Kb1 Bh4 29.Rd5 g3 30.Qe2 Re8 31.Qf3 Qf6 32.Re1 g6 33.Re2 Re6 34.Ka2 Qe7 35.f5 gxf5 36.Rxf5 Re5 37.Rd2 Rxf5 38.exf5 Bf6 39.Qxg3 Qe5 40.Qxe5 Bxe5 41.f6 Kg8

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