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Xiu Deshun vs Yang Wen
Chinese League (2012), Beijing CHN, rd 1, Apr-28
King's Indian Defense: Saemisch Variation (E86)  ·  0-1



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sac: 18...Rxb2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Premium Chessgames Member
  HeMateMe: Talk about having your throat grabbed by the a1-h8 diagonal. Pretty nice planning by black.
Jun-30-12  luzhin: A classic demonstration of the risks of long castling against the King's Indian: 15...Nd5!! was inspired. If 21.Qxd5 c2 22.Rc1 Qb4 leads to mate.
Premium Chessgames Member
  perfidious: Kasparov commented on this sacrificial orgy, with notes reproduced here: pinoymaster77 chessforum
Aug-14-22  jrredfield: I missed this badly. One of my worst weeks. I analyzed the moves leading up to this position and see that White blundered by not taking the pawn (15.Nxc3). That would have led to a draw. 15.cxd7 immediately gave Black a 3-pawn advantage.
Premium Chessgames Member
  An Englishman: Good Evening: Saw only the first move, which simply does not suffice for such a difficult and complicated puzzle. Would not surprise me if a refutation lurked somewhere in the thicket of thorns.
Aug-14-22  mayankk06: I saw some of the main themes in this position:

1) White Bishop at e3 is undefended. After Nd5, if it moves then Nb4 seems deadly as it attacks the c2 queen as well as threatens Qxa2.

2) Black can afford to sacrifice at dxc8 given the strength of Nd5 as it is likely to get the Bishop back in some lines.

3) If the Queen moves then Rb8 seems to bring new threats. The simple b3 defence may fail to Nb4 again when a3 is no longer available.

The trouble of course is that White has a variety of defensive options like Bc1, Nc1, b3, a3 etc. Too tough to know if any combination of these lets White escape.

Aug-14-22  mel gibson: I wasn't sure.

Stockfish 15 says:

15... Nd5

(15. .. Nd5 (♘f6-d5 d7xc8♕ ♖f8xc8 d4xe5 ♘d5xe3 ♕c2xc3 ♕a5xc3 ♘e2xc3 ♘e3xd1 ♘c3xd1 ♗g7xe5 ♘d1-f2 a6-a5 ♘f2-d3 ♗e5-d4 ♗f1-e2 ♖c8-e8 ♗e2-d1 ♖e8-e3 ♔b1-c2 ♖a8-c8 ♔c2-d2 ♖e3-e7 ♖h1-e1 ♖e7xe1 ♔d2xe1 ♗d4xc5 ♔e1-d2 ♗c5-d4 f3-f4 ♔g8-g7 ♗d1-f3 ♗d4-f6 a2-a3 ♔g7-f8 b2-b3 ♖c8-c7 ♗f3-d5 ♗f6-c3+ ♔d2-e2 h7-h5 b3-b4 ♖c7-e7+ ♔e2-d1 ♖e7-d7 ♗d5-c4 a5xb4 a3xb4 ♗c3xb4 ♔d1-e2 ♖d7-c7 ♘d3-e5 ♗b4-d6 ♗c4xf7 ♗d6xe5 ♗f7xg6 ♗e5xf4 ♗g6xh5 ♖c7-c2+ ♔e2-f3 ♗f4xh2 ♗h5-g6 ♖c2-a2 ♗g6-f5 ♔f8-e7 ♗f5-h3 ♔e7-d6 ♔f3-e4 ♗h2-g3 ♗h3-g4 ♔d6-c5 ♗g4-f3 ♖a2-f2 ♔e4-e3) +3.95/53 714)

score for Black +3.95 depth 53.

Aug-14-22  CaliWest: Why 25. Rd8+???
Aug-14-22  derfderf: Because c2 is mate
Aug-14-22  Brenin: After far too long, rejecting moves like 15 ... Bxd7 or Nxd7 (16 Qxc3!) I guessed that the solution must be 15 ... Nd5 16 dxc8=Q Rfxc8, but I wasn't convinced that responses such as 17 dxe5 or 17 Nxc3 were inadequate. It seems that they are, with Black getting a good endgame after the exchanges.
Aug-14-22  saturn2: 15...Nd5 seemed to me to have some prospects.
Premium Chessgames Member
  agb2002: Black is two pawns down.

White threatens dxc8=Q, dxe5 and Qxc3.

The defenseless bishop on e3 invites to consider 15... Nd5:

A) 16.dxc8=Q Rfxc8

A.1) 17.Bf2 Rab8 18.b3 (18.Nxc3 Nxc3+ and 19... Nxd1 must be winning) 18... Nb4 19.Qxc3 Qxa2+ 20.Kf1 Bh6+ 21.f4 exf4 looks very good for Black. For example, 22.Ng1 f3+ 23.Rd2 Bxd2+ 24.Qxd2 Qa1#.

A.2) 17.Bc1 Nb4 18.Qb3 c2+ wins.

A.3) 17.Qe4 Rab8 (17... Nb4 18.Nxc3 and White holds)

A.3.a) 18.Qxd5 Rxb2+ 19.Ka1 (19.Kc1 Qa3 20.Re1 Rd2+ 21.Kb1 Qb2#) 19... c2 20.Kxb2 (20.Rc1 Rcb8, followed by ... Rb1+, wins) 20... cxd1=Q wins.

A.3.b) 18.b3 Qa3 19.Bc1 Rxb3+ 20.Ka1 (20.axb3 Qxb3+ 21.Ka1 Qa4+ 22.Kb1 Rb8+ 23.Bb2 Rxb2+ 24.Kc1 Qa8#) 20... Rb2 21.Qxd5 Rcb8 as in A.3.a.

A.3.c) 18.Bc1 Qa3 19.Qc2 (19.b3 Rxb3+ transposes to A.3.b) 19... Rxb2+ 20.Bxb2 Rb8 seems to recover material while keeping the attack.

A.4) 17.Qd3 Rab8 looks similar to A.3.

B) 16.Bf2 Nb4 17.dxc8=Q Qxa2+ 18.Kc1 Qa1+ 19.Qb1 Qxb1+ 20.Kxb1 c2+ 21.Kc1 cxd1=Q+ 22.Kxd1 Raxc8, unclear.

Premium Chessgames Member
  Teyss: <agb2002> In you B line instead of 16...Nb4 SF prefers Rb8 with pressure on the b file and threats as Qa3 and only then Nb4 (would never have found this).

Splendid combination even if White didn't find the best continuation. I especially like 18.Bc1 protecting b2... Rxb2+! regardless and the simple 24...Rb8!

Was wondering why 27.g3: it's to counter a future Bh6+ with f4. At the end I thought it would be one of the those complex- combinations- leading- to- simplification- with- minor- yet- decisive- advantage but White cannot avoid 28...Rb2+ 29.Kc1 (29.Ka1 c2 or Rmoves) Be3+ 30.Kd1 Rd2+ 31.Kc1 (31.Ke1 c2) Rxh2+ winning the R.

Premium Chessgames Member
  chrisowen: Hoodies it auld Nd5 ghouls duldrum axioms jocky goofball it acrid muddle Nd5 with...
Premium Chessgames Member
  beenthere240: Black to play �24 is tough enuf since it seems to call for heroic measures whereas a retreat to the back rank is the killer.
Aug-14-22  jes47: Not at all a puzzle, just a series of blunders on both sides. 17. Qe4?? tossed an easy win (+7.6). For example 17. Nxc3 Nxe3 18. Bx3e and black has nothing, not even a prayer.

Black returned the favor with the inaccurate 18. ... Rxb2+, which gave white a chance to escape with 19. Bxb2 Rb8 20. Qdx5! and stockfish rates it dead even. Black should have continued with 18. ... exd4 with an advantage.

Then white blundered again with 21. Nc3?? and after 21. ... Qxc3 black has mate in four. According to stockfish 21. Qxd5 Rxb2+ 22. Ka1 would have been dead even, e.g. 22... Re2 23. Qc4 c2 24. Rc1 Qa3 25. Bf2 Rxf2 26. Rxc2.

It's an interesting game, but when CG calls it a puzzle it implies good moves were played, and we are challenged to discover them. That's not what happened here.

Aug-15-22  Brenin: <jas47>: I think you will find that after 17 Nxc3 Nxe3 it is Black who is winning (I don't know what you mean by 18 Bx3e), e.g.18 Qa4 Qxa4 19 Nxa4 Nxd1 20 Nb6 Nf2 21 Rg1 exd4 22 Nxc8 Rxc8 23 Bxa6 Rc6.
Premium Chessgames Member
  Teyss: <jes47> Are you looking at the same game? The moves you provide are impossible and/or the evaluations are wrong.
Premium Chessgames Member
  agb2002: <Teyss: <agb2002> In you B line instead of 16...Nb4 SF prefers Rb8>

16... Rb8 was my original intention, as in A.1., but I didn't have much more time for this puzzle and thought that 16... Nb4 could be far simpler.

After typing the B line, I noticed that the pawns might compensate somewhat the exchange so I settled for 'unclear'.

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