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Peter Acs vs Vladimir Chuchelov
Bundesliga (2006/07), Germany, rd 12, Mar-17
Sicilian Defense: Delayed Alapin (B50)  ·  0-1

ANALYSIS [x]

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sac: 26...Rxg2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jun-18-20
Premium Chessgames Member
  Predrag3141: I expected 26 Rxg2+ 27 Qxg2 Rg8 28 Ng4 h5.
Jun-18-20  newzild: 26 Rxg2+ 27 Qxg2 Rg8 28 Ng4 h5

or

26 ... Rxg2+ 27 Kxg2 Rg8+ and now:

28. Kh1 Qd5+ +-
28. Kf2 Bh5+ recovers the exchange with a strong attack

Jun-18-20  Cheapo by the Dozen: I "solved" this puzzle very quickly based on Spielmannesque faith. <Predrag3141>'s line was easy to find, and alternatives for White would also allow Black to have a blistering attack for little or no net material sacrifice.
Jun-18-20  mel gibson: I didn't get this one.

Stockfish 11 agrees with only the first ply:

26... Rxg2+

(26. .. Rxg2+ (♖g8xg2+ ♕f1xg2 ♖a8-g8 ♘h2-g4 h6-h5 ♖e1xe5 d6xe5 ♔g1-f1 h5xg4 h3xg4 ♔h7-h6 ♔f1-e2 ♗f6-h4 ♖a1-h1 ♔h6-g5 ♔e2-d1 ♕f7-d7 ♕g2-e4 ♕d7-c6 b2-b3 ♕c6xe4 d3xe4 f4-f3 ♔d1-d2 ♖g8-h8 ♔d2-e3 ♗h4-f2+ ♔e3xf3 ♖h8xh1 ♔f3xf2 ♖h1-h3 b3-b4 c5-c4 ♔f2-e2 ♖h3xc3 ♔e2-d2 ♖c3-d3+ ♔d2-c2 ♖d3-b3 b4-b5 ♖b3-e3 ♔c2-d2 ♖e3-d3+ ♔d2-c2 b7-b6 ♔c2-c1 ♖d3-g3 ♔c1-d2) +8.05/38 246)

score for Black +8.05 depth 38

Jun-18-20  stacase: Didn't see 29...Qd5
Jun-18-20  Brenin: The exchange sacrifice was easy to see. After 26 ... Rxg2+ 27 Kxg2 (Qxg2 worth trying?) Rg8+ I expected 28 Ng4 Nxg4 29 hxg4 Rxg4+, e.g. 30 Kf3 Qh5 with massive threats, but not as severe as in the game line, when Black also has the N on e5 to help attack the K.
Jun-18-20
Premium Chessgames Member
  Predrag3141: <Spielmannesque faith> (n): The belief that an attack is sound when one cannot enumerate every variation but sees only variations that work.

That is how I felt when I clicked through.

Jun-18-20  TheaN: I looked at 26....Rxg2 and discarded it instantly, because I thought White had enough defensive power after 27.Kxg2 Rg8+ 28.Kh1. Back to that later.

For quite a long while (too long) I wanted 26....f3 to work, but in that case Black's lacking firepower. Ie 27.Nxf3 Rxg2+ (Rg3 is 0.00 apparently) 28.Kxg2 Rg8+ (Qd5 29.Re3 +- is quite simple) 29.Kh2 looks shaky but 29....Qh5 30.Nxe5 Bxe5+ 31.Rxe5! (Kh1 Rg3 -+) ± and White's up a solid pawn. That's very close though.

I started looking at 26....Qh5 ∓ directly which apparently works after 27.Kh1 (anything else is horror) Rg3. But that's farfetched, making me believe it had to be <26....Rxg2+> anyway.

And at that point did my eye fall upon <27.Kxg2 (Qxg2 Rg8 28.Ng4 h5 -+) Qd5+!?>. Not best but similar. But somehow I couldn't get Rg8+ to work. Black wins rather comfortably after <28.Re4 (Nf3 Nxf3 -+ 29.Qxf3? Rg8+ 30.Kf2 Bh4+ 31.Ke2 Re8+)> only now to still drop the ball with 28....Nxd3? 29.Qf3 ⩲. Of course, <28....Rg8+> I somehow seem to refuse to reload <29.Ng4 Nxg4 30.hxg4 Rxg4+ 31.Kf2> mind the beautiful 31.Kf3 Rg3+ 32.Kxf4? Be5+ 33.Rxe5 Qxe5#. Beauty in the eye of the beholder. <31....c4!>


click for larger view

and the White position collapses under pressure.

However, all of that is so unnecessary. Lets jump back to my first paragraph. "I looked at 26....Rxg2 and discarded it instantly, because I thought White had enough defensive power after 27.Kxg2 Rg8+ 28.Kh1.". 28....Qd5 29.Re4 Nxd3 -+.

When you see a good move, look for a better one. But if the first move is best, use it.

Jun-18-20  beenthere240: ...29 Qd5 is very elegant. It combines the brutal threat of Qxd3+ with the equally devastating prospect of Rg2+.
Jun-18-20  Brenin: After 26 ... Rxg2+ 27 Kxg2 Rg8+ 28 Kh1 Qd5 29 Re4 Nxd3 it's not all over, and Black needs to tread carefully: 30 Re1 Nxe1 31 Qxe1 Re8 32 Ng4, and either capture on e4 loses to Nxf6+. Black must move the B on f6, e.g. 32 ... Bh4 33 Qxh4 Qxe4+; Black is the exchange and a pawn up, with a strong attack, but still has to keep an eye on f6 and h6.
Jun-18-20
Premium Chessgames Member
  Predrag3141: <After 26 ... Rxg2+ 27 Kxg2 Rg8+ 28 Kh1 Qd5 29 Re4 Nxd3 it's not all over, and Black needs to tread carefully: 30 Re1>


click for larger view

Instead of 30 Re8, keeping the rook on g8 long enough for the bishop to be immune with 30 Bh4 is a kill. The queen has to move, e.g. 31 Qe2, and 31 Re8 wins the rook outright.

Jun-18-20
Premium Chessgames Member
  Predrag3141: Slight correction, there are two ply in-between so 30 Bh4 was really 31 Bh4, etc.
Jun-18-20
Premium Chessgames Member
  chrisowen: Dangerous flashback no?
Jun-18-20
Premium Chessgames Member
  thegoodanarchist: Easy puzzle for a Thirsty Thursday
Jun-18-20  W Westerlund: I don't get it. What happens after 30. Kd1 for example?
Jun-18-20  SpamIAm: <W Westerlund>, after 30.Kd1 Qb3+ 31.Kc1 (if 31.Ke2 Qc2# or 31.Kd2 Qxb2+ followed by 32...Qxa1+) Bxe1 32.Qxe1 Rg2 wins the knight with the threat of 33...Qc2#. Black will be a piece up.
Jun-18-20
Premium Chessgames Member
  Predrag3141: <What happens after 30. Kd1 >

Maybe there's a shot we're missing. For example, 30 Qb3+ might turn out to be a quick kill that I don't see and Stockfish would. But in the spirit of the question I'll forego Stockfish and put myself in White's shoes.

A good reason to resign is that 30 Bxe1 and 31 Nxd3 starts dismantling White's position.

Jun-18-20
Premium Chessgames Member
  WorstPlayerEver: 30. Kd1 Rg2
Jun-18-20
Premium Chessgames Member
  agb2002: The position invites to play 26... Rxg2+ followed by Rg8. Unfortunately, I haven't found the time to analyze the details.
Jun-18-20  SpamIAm: Yikes, am I a fish. After 30.Kd1 Qb3+ 31.Kc1 Bxe1 32.Qxe1 Nxd3+ forking king and queen is even simpler. Methinks that white was quite correct to resign when he did.
Jun-18-20
Premium Chessgames Member
  thegoodanarchist: < SpamIAm: Yikes, am I a fish. After 30.Kd1 Qb3+ 31.Kc1 Bxe1 32.Qxe1 Nxd3+ forking king and queen is even simpler. Methinks that white was quite correct to resign when he did.>

I thought the same.

<W Westerlund: I don't get it. What happens after 30. Kd1 for example?>

Please refer to the post of <SpamIam>

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