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Alan Pichot vs Ivan Cheparinov
Gibraltar Masters (2018), La Caleta GIB, rd 5, Jan-27
Sicilian Defense: Najdorf Variation (B96)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jan-27-18
Premium Chessgames Member
  Moose Malloy: Very nice defensive shot 21...Rg1+
Jan-13-19  ChessHigherCat: White is threatening mate in 1 with f7# and the possible defenses (Rg7, Qf5 or Qh5) all look horrible, so the first move has to be a check, and since the only check is Rg1+:

21...Rg1+ 22. Rxg1 Bxb7 23. Qe3 Qf5 24. Rg3 Kf7 25. Ne4 Bxe4 26. fxe4 Qh5 27. Rxh3 Qd1+ 28. Qg1 Qxg1+ 29. Kxg1 Kxf6 and black is a piece up.

If only the other hand:

21...Rg1+ 22. Kxg1

here black could force the trade of queens with Qg5 but it doesn't work. Bc5+ doesn't work either, so it must be:

21...Rg1+ 22. Kxg1 Qc5+ 23. Kh1 Bxb7 threatening mate with Bxf3 the question is whether black can survive the attack:

21...Rg1+ 22. Kxg1 Qc5+ 23. Kh1 Bxb7 24. Rxe6+ Kf7 25. Qd7+ Kg8 26. Qxb7 Qf2 27. f4 Qf1#

Yeah, I found it, I found it, but I'm sure I missed something, let's see what really happened...

Jan-13-19  ChessHigherCat: Ivan to mate you and I'm gonna do it!

Well I didn't deviate until move 26 which is pretty good for me for a Sunday (he says kissing his hand :D

Jan-13-19
Premium Chessgames Member
  drollere: i considered 22. .. Bc5+ and after Qc5+ 23. Re3, and those turn out badly for W also.
Jan-13-19  Walter Glattke: 21.-Bxb7?? 22.Rxe6+ Kf7 23.Qd7+ Kg6 24.f7+ White wins 21.-Rg1+ 22.Kxg1 Qc5+ 23.Kh1 (Kf1 Qc4+) Qc6 24.Re7+ Bxe7 25.Qe3 Bc5
Jan-13-19  Walter Glattke: or not!? 24.f7+ Kh6 furious continuations.
Jan-13-19  mel gibson: Didn't have a clue.

Stockfish 10 agrees with the solution for quite a few plies.

1. ... Rg1+

(21. .. Rg1+ (♖g8-g1+ ♔h1xg1 ♕a5-c5+ ♔g1-f1
♕c5-c4+ ♔f1-f2 ♗c8xb7 ♔f2-g3 ♗f8-b4 ♖e1-d1 ♕c4-c7+ ♔g3xh3 ♗b7xf3 ♖d1-g1 ♕c7xc3 ♕d2xc3 ♗b4xc3 ♖g1-g3 ♔e8-f7 ♖g3xf3 ♖a8-c8 ♖f3-f4 ♗c3-e5 ♖f4-a4 ♖c8xc2 ♔h3-g4 ♖c2xh2 ♖a4xa6 h6-h5+ ♔g4-f3 ♖h2-h3+ ♔f3-e4 ♔f7xf6 ♖a6-a7 ♖h3-h4+ ♔e4-d3 ♖h4-d4+ ♔d3-e3 h5-h4 ♖a7-h7 ♔f6-g5 ♖h7-e7 ♔g5-f5 ♖e7-h7 ♔f5-g4 ♖h7-e7 ♖d4-d5 ♖e7xe6) +6.41/35 )

score for Black +6.41 depth 35

Jan-13-19  schachfuchs: Thanks for the well-chosen sunday puzzle - played exactly one year ago!
Jan-13-19  Pchief: 21...Rg1+ may be the only move since a non-check move allows white to play 22.f7#. And if 21...Bxb7 then 22.Rxe6+ Kf7 23.Qd7+ is also disastrous.

Difficult is to calculate the consequences of 22.Kxg1 Qc5+ 23.Kh1 Bxb7.

Jan-13-19  landshark: I have a hard time picking up the thread in wide-open tactical situations - like this one here where it was: Fuhgeddaboudit!!!

Good job to all of you who saw the first 3 moves or more (:

Can anyone recommend a good source of tactical training especially for these wide open positions? They're where I need the most work -

Jan-13-19  RandomVisitor: The sacrifice sequence beginning with 20.Nxe6?! caused white big problems. Better might have been 20.Qd3:


click for larger view

Stockfish_19011016_x64_modern:

<56/61 0.00 20...Rg2 21.f4 b5> 22.Qf3 Ra7 23.Qxh3 Rd2 24.Nb3 Bb7+ 25.Ne4 Qa3 26.Kg1 Bxe4 27.Rxe4 Rad7 28.f5 Rd1+ 29.Kg2 R7d2+ 30.Kf3 Rxb1 31.fxe6 Rxb3+ 32.axb3 Qc1 33.exf7+ Kd8 34.Re8+ Kc7 35.Qc8+ Kb6 36.Re6+ Rd6 37.Rxd6+ Bxd6 38.Qd8+ Kc6 39.Qxd6+ Kxd6 40.f8Q+ Ke5 41.Qe7+ Kf5 42.h4 a5 43.Qc5+ Kxf6 44.Qf8+ Ke5 45.Qb8+ Kd4 46.Qh8+ Kd5 47.Qd8+ Kc6 48.Qf6+ Kc5 49.Qe7+ Kb6 50.Qf6+

Jan-13-19
Premium Chessgames Member
  agb2002: I know this game.
Jan-13-19
Premium Chessgames Member
  Breunor: It's great to see crazy exciting games like this are still played.
Jan-13-19  dumbgai: <ChessHigherCat: White is threatening mate in 1 with f7# and the possible defenses (Rg7, Qf5 or Qh5) all look horrible, so the first move has to be a check, and since the only check is Rg1+>

Bxb7 also needs to be considered.

Dec-18-19  SpiritedReposte: Development? King safety? Overrated says black in this sicilian.

White looks to have a shot but comes up missing.

Feb-02-20  Walter Glattke: 26.Qxb7 Qxc3 27.Qd3 Qa1+ 28.Qe1 Qxe1+ 29.Rxe1 Kf7 wins.
Feb-02-20  PaperBridge: Glattke: by 27. Qd3 do you mean 27. Qe4?
Feb-02-20
Premium Chessgames Member
  scormus: 21 ... Rg1+!! must have come as a bit ofa shock to W
Feb-02-20
Premium Chessgames Member
  agb2002: Level 4: 23... ?
L Van Vliet vs Lasker, 1892


click for larger view

Feb-02-20  goodevans: This isn't <insane>.

White is threatening 22.f7#. 21...Bxb7 would prevent that but fails to 22.Rxe6+ Kf7 23.Qd7+ Kg6 24.f7+ Kh7 25.fxg8=Q+ so <21...Rg1+> really is the only first move that doesn't lose outright.

After <22.Kxg1> can black play 22...Bxb7 yet? Well yes, if he's happy with a draw: 22...Bxb7 23.Rxe6+ Kf7 24.Qd7+ Kg8 25.f7+ Kg7 26.Qd4+ and black can't escape the checks. But does he have anything better? He has a choice of checks on c5 with Q or B, either at which prevents an eventual Qd4+, but the B is needed on f8 to guard g7 so <22...Qc5+> is the only move that might give an advantage.

Now there are two K moves to consider (other moves obviously lose). It's not too difficult to work out that <23.Kh1> loses to <23...Bxb7> as in the game. Trying to hide in the corner allows black to create mate threats on both g2 and the back rank as the game shows.

Things do get a little bit harder to work out after <23.Kf1>. The immediate 23...Bxb7 succumbs to 24.Rxe6+ Kf7 25.Qd7+ Kg8 26.Qxb7 but what if black plays <23...Qc4+> first. The Q now protects e6 so now <...Bxb7> will indeed win.

Feb-02-20  goodevans: I think my claim that this isn't <insane> needs a bit more explanation.

Sunday <insane> puzzles typically have many lines to be evaluated or lines that are tortuously long or that lead to very subtle advantage. My previous post shows that for today's puzzle there are only a handful of lines that need proper consideration and their evaluation becomes clear after no more than half a dozen moves or so.

More of a Thursday/Friday puzzle IMHO.

Feb-02-20
Premium Chessgames Member
  An Englishman: Good Morning: 5/7 this week, flubbed Saturday and Sunday. Thank heavens for nice, normal weeks.
Feb-02-20  schachfuchs: Uh, I didn't remember having seen that one year ago :-( and wasn't sure about the outcome of (the only move) 21...Rg1+. Ok, maybe "goods things come three" - is that correct?
Feb-02-20
Premium Chessgames Member
  scormus: I have to conclude this position really is insane, but not for the usual reasons. When W played 21 Rxb7 he must have felt fairly confident he was winning, at least I would have been. But the Silicon finds that the double sac 20 Nxe6, 21 Rxh7 was completely unsound.

Also the postion was even (sort of) after 20 Qd3, with W's positional advantage just about balancing the pawn deficit. Despite the more active W pieces, B has the B-pair and the open g-file. I never thought much of the Poisoned Pawn for B, but ... h6 and g5 with the chance to get the g-file open makes it looks more appealing.

Where did W go wrong? He put too much faith in his lead in development and the illusion of the K being safe on h1

Feb-02-20
Premium Chessgames Member
  Jimfromprovidence: I don't think anyone has covered why 22...Qc5+ 23 Kh1 works for black.

The excellent post of <goodevans> covers 22...Qc5+ 23 Kf1.

I believe it's for two reasons that the queen being on c5 works. In the text position after 27...Qg5, below, black threatens 28...Qg2# and it looks like white has to give up ample material to prevent that.


click for larger view

In the second example, here is the text after 25...Kg8, below.


click for larger view

White cannot try something like 26 Qxb7 because of 26...Qf2 and a mate in one threat.


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