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Alexander Solomon Barnett vs Alexander Shabalov
22nd North American Open (2012), Las Vegas, NV USA, rd 1, Dec-26
Sicilian Defense: Najdorf Variation (B90)  ·  0-1



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sac: 25...Rxc2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
May-27-21  Walter Glattke: A) 25.-Rxc2 26.Kxc2 Rc8+ 27.Kd1 Qxd3+ 28.Qxd3 Nf2+ 29.Ke2 Nxd3 30.Bc3 Nxe1 31.Kxe1 e6 R+ P for B B) 26. Kd1 Nf2+ 27.Kxc2 Qxd3+ 28.Qxd3 Bxd3 29.Ke2 Kxg7 30.Ke3 Ne1 31.Kxd3 Nxb2+ RN+2P for B C) 25.-Rxc2 26.Kxc2 Rc8+ 27.Kb1 Nd2+ 28.Ka1 Rc1+ 29.Bb1 Bb3+ or 29.-Rxb1+ 30.Ka2 Qxd3
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White threatens fxe4.

The bishop x-rays the rook on d3 and c2. This invites to play 25... Rxc2+:

A) 26.Kxc2 Rc8+

A.1) 27.Kd1 Qxd3+ 28.Qxd3 Nf2+ 29.Kd2 Nxd3, with the double threat Kxg7 and Nxe1, wins decisive material.

A.2) 27.Kb1 Nd2+ 28.Ka1 Bxd3 seems to win (29.Bh8 Nb3+ 30.Bxb3 axb3+ 31.Qa4 Qxa4#).

A.3) 27.Rc3 Nxc3+ 28.Kd2 Nxa2 is winning.

B) 26.Kd1 Qxd3+ 27.Qxd3 Nf2+ 28.Kxc2 Nxd3 as in A.1.

C) 26.Kb1 Nf2 27.Kxc2 Qxd3+ 28.Qxd3 Nxd3 as in A.1.

Premium Chessgames Member
  drollere: i got the basic line, up to the discovered pin on the R with 27. .. Nd2+. i'm unclear given that obvious threat why white did not retreat the K to d1.

the threat that prompted resignation was apparently Nb3+, forcing a mate or losing the Q.

<Stockfish 13 plays a different line>

this apparently goes for the Q fork directly. but how does black handle the counterthreat Bh8/Qg7#?

Premium Chessgames Member
  agb2002: 28... Nb3+ is far stronger than my 28... Bxd3.
May-27-21  mel gibson: I saw that.

however Stockfish 13 plays a different line:

25... N-c5

.. Nc5 (♘e4-c5 ♖d3-c3 ♘c5-b3+ c2xb3 ♖c8xc3+ b2xc3 a4xb3 ♗a2xb3 ♕a6-a3+ ♔c1-d2 ♕a3xb3 ♗g7-e5 ♖a8-a2+ ♔d2-e3 f7-f6 ♗e5xf6 e7xf6 ♕d4-d8+ ♔g8-g7 ♕d8-e7+ ♕b3-f7 ♕e7xf7+ ♔g7xf7 ♖e1-g1 h5-h4 c3-c4 ♔f7-e7 ♔e3-d4 ♗f5-d7 h2-h3 ♔e7-f7 ♔d4-d5 ♖a2-d2+ ♔d5-e4 ♗d7-c6+ ♔e4-e3 ♖d2-a2 ♔e3-d4 ♗c6-a8 ♔d4-c5 ♔f7-e6 ♖g1-e1+ ♔e6-f5 ♖e1-e8 g6-g5 ♔c5-d6 ♔f5-f4 ♖e8-f8 ♖a2-a6+ ♔d6-e7 ♔f4-g3 ♖f8xf6 ♖a6-a7+ ♔e7-e6 ♔g3xg2 ♔e6-f5 ♔g2xh3 ♔f5xg5 ♔h3-g3 f3-f4 ♗a8-f3 ♖f6-h6 ♖a7-g7+ ♔g5-f6 ♖g7-g4 ♔f6-e5 ♖g4xf4 ♔e5-d6 ♖f4-d4+ ♔d6-e7 h4-h3 c4-c5 h3-h2) +5.25/49 1152)

score for Black +5.25 depth 49

Premium Chessgames Member
  Dionysius1: The purpose of the daily puzzle feature is to challenge us to find the best move from the given position. Daily Puzzle F.A.Q.

So working out what the winner and his opponent did in the actual game isn’t the same as solving the puzzle.

Isn’t it reasonable to interpret that as meaning “what would the player do against best defence by his opponent?” That’s what solving a chess puzzle means, isn’t it?

If so the solution is actually 25…♖xc2+ 26. ♔xc2 ♖c8 27. ♔d1 ♕xd3 28. ♕xd3 ♘f2+ 29. ♔d2 ♘xd3 and Black is winning although there’s no immediate mate.

Not the much sexier 25…♖xc2+ 26. ♔xc2 ♖c8+ 27. ♔b1 ♘d2+ 28. ♔a1 ♘b3+ 29. ♔b1 ♗xd3 30. ♕xd3 ♕xd3#

I saw the latter, and looked no further, so I can’t claim to have solved the puzzle. If I’ve got this analysis of what it means to solve a puzzle right, people who saw the sexy mate but not the Black is winning continuation did not solve the puzzle either ☹

Premium Chessgames Member
  drollere: <So working out what the winner and his opponent did in the actual game isn’t the same as solving the puzzle.>

well, since you're quoting the FAQ, it's reasonable to reply that if what you say is actually solving the puzzle, then the FAQ would say that. but it doesn't.

i can't harsh on someone trying to lay down the law on puzzle commentary. heck, i've done it myself for my own amusement.

but people who like to say that it was hard or easy will do so; people who complain it's too hard or too easy will do so; people who are dispirited to miss it or elated to find it will do so; and that's how it is here.

chess puzzles are like vibrators. you can use them for all kinds of personal and household tasks. which one you choose is not my business.

May-27-21  1g1yy: <If so the solution is actually 25…♖xc2+ 26. ♔xc2 ♖c8 27. ♔d1 ♕xd3 28. ♕xd3 ♘f2+ 29. ♔d2 ♘xd3 and Black is winning although there’s no immediate mate.>

The way I see that, black is getting ready to lose a bunch more material. Either the bishop at G2 or the Rook on the exchange, at which point I see black down a pawn and white with the initiative.

If I'm white I don't see myself taking the queen exchange anyway.

May-27-21  AlicesKnight: I saw the basic break-in but like others expected 27.Kd1 and the subsequent recapture of the R with interest and a "won game". A certain amount of help by White (putting the R on d3, withdrawing the B from a4).
May-27-21  malt: Looked at 25...Nf2 26.Rd2 line first,

went for 25...R:c2+ 26.K:c2 Rc8+ 27.Kd1

(27.Kb1 Nd2+ 28.Kh1 Nb3+ wins )

27...Q:d3 28.Q:d3 Nf2+ 29.Kd2 N:d3

Premium Chessgames Member
  Dionysius1: Thanks <drollere>. I think you're right - it's for whatever we want. I'm trying to get myself into puzzles so working out loud what I want to achieve. In a game I'd be happy if my opponent played either Kb1 or Kd1, in a puzzle I'd have to work out both. Cheers.
May-27-21  Lambda: I think you need to see enough to be correctly convinced the move is best, leaving nothing to chance. So that means looking at all possible defences, the defence which was actually used in the game being immaterial. If there's a plausible defence you fail to consider, you haven't quite solved it, even if that defence wasn't tried and turns out not to work.

(Once you get to situations like "I'm just a clear exchange up in a normal position" or indeed "I'm a clear exchange up and I'm still attacking" in a line, you're done.)

Premium Chessgames Member
  chrisowen: Mississippi vantage mav Rxc2+ fiddles arrive it ooh boats tally ovids mississippi vantage mav Nc5 gungho vantage abrash lunch vam changes cab creaks vestige frazzle blimps pie it is ark vestige quick vantage quincy waited hog u jovial it is lazers vantage vests bed it is harp toxin worry muffles vantage pack veins addup handy aorta cajole on jack hobbs huddle honour veins it position vein on fire bye it hads crew it met Rxc2+ flack;
Premium Chessgames Member
  chrisowen: Mobys o ago Nc5 blubber it whale hook no?
Premium Chessgames Member
  chrisowen: Nearly caught Nc5 but jam Rc2 with backup no?
May-27-21  Morphy111: I thought 25... Qxd3 26. Qxd3 Nf2..
May-27-21  saturn2: 25...Rxc2+ 26. Kxc2
I took the Stockfish move Nc5 here
27. Rd1 (Qxc5 Rc8) Nxd3 28. Rxd3 Rc8+ 29. Kd2 Qxd3+ 30. Qxd3 Bxd3 black is an exchange up
Premium Chessgames Member
  chrisowen: Nil by mouth skeleton ja no?
Premium Chessgames Member
  chrisowen: Hogga it was c5 no bark

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