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Pablo Ricardi vs Nicolai Vesterbaek Pedersen
Calvia Olympiad (2004), Calvia ESP, rd 5, Oct-19
English Opening: Agincourt Defense. Catalan Defense (A13)  ·  1-0



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sac: 28.Rd6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-09-16  diagonalley: <al wazir> ... me too! (as usual)
Premium Chessgames Member
  scormus: The sequence was easy enough to find until 33, then that's where the real puzzle started. 33 Bxc5 looked obvious but didn't seem to yield much of an advantage.

Instead W has to keep the BQ tied up while consolidating his position. After some looking I went for 33 Bb5, intending 34 Bxc5.

The engine took some time to get there as well, confirming it is not an easy find, but gave 33 Bb5 (+2.0) as better than Bxc5?! (+1.5) Best of all was 33 Ba4! (+2.5) and the W pawns and LSB are secure. The BQ has to move, W will pick up both the c and b pawns and can take complete control.

Great vision by Ricardo to see the combination would lead to this clearly winning position.

Apr-09-16  Al2009: Why 31. Qxc6 immediately? (allowing a stubborn resistance for more than 20 moves)

White - after the correct sac of exchange - missed the much stronger intermediate:

31. Bxc5!!

and after

31...Qxc5 (31...Qb8? 32. Bd6) 32. Qxc6! Rxc6 33. d8 = Q+ Kg7 34. Bxc6 Qxc6 35. Qd4+ Kg8 36. c5! Qb7 (or 37...Qb5) 38. Qd6! and White wins at once, no way to prevent c6-c7 etc.

What a pity! A flawed masterpiece...

Premium Chessgames Member
  rodchuck: I thought 28.Bh6 Bf8 29.Qxc6 Rxc6 30. Bxc6 Qxc6 31.Rd8 and its all over, but of course black doesn't have to oblige with Bf8
Apr-09-16  prashant107: What after 29.ed6 Rd7? I didnt see a continuation for white.
Apr-09-16  Cheapo by the Dozen: I got this through Move 32, but incorrectly assumed that Black had to capture White's c6 bishop at that point.

So there's a good chance that, over the board, I would have blundered into the winning line. :)

Apr-09-16  ndg2: The first five moves (28.Rd6 up to 33...Kg7) are quite clear. At this point white could already give up his two bishops for a new queen with 34.Bxc5 Qxc6 35.d8=Q Qxc5 and still standing better despite the material balance because of the protected passer on c4.

I think this reassurance was the reason he played the whole combination.

But white can aim for more and he did so in convincing manner. The queen is no match for the two bishops and the two conbected passers and in the end there's no perpetual.

Apr-09-16  ndg2: Correction: of course black must play 34.Bxc5 Qxc5 34.d8™Q Qxc6, otherwise white would save one bishop with 35.Bd4+ first and only then promote to queen.
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black can defend its knight only twice but White can attack it three times with 28.Rd6, trying to create a very dangerous passesd pawn:

A) 28... Bxd6 29.exd6 Rc8 (else dxc7 or Qxc6) 30.d7 Rc7 (30... Rd8 31.Qxc6 + - [2B vs R]) 31.Qxc6 Rxc6 (31... Qxc6 32.d8=Q+ wins) 32.Bxc6

A.1) 32... Qxc6 33.d8=Q+ + - [B vs P].

A.2) 32... Kf8 33.Bxc5+ Qxc5 34.d8=Q+ Kg7 35.Be8 + - [B].

A.3) 32... f6 33.Bxc5 Qd8 (33... Qxc6(5) 34.d8=Q+ as in A.1(2); else 34.Be7 followed by d8=Q) 34.Bxb4 with the plan Bd6, b4, b5, b6, etc. looks winning.

A.4) 32... Qd8 33.Bxc5 as in A.3.

B) 28... f5 29.exf6 (or 29.Qf3, similar to A) 29... Bxd6 (29... Bxf6 30.Rxc6 + - [B]) 30.Qxe6+

B.1) 30... Kf8 31.Bh6+ Rg7 32.B(f)xg7#.

B.2) 30... Kh8 31.Qe8+ Bf8 32.Qxf8#.

B.3) 30... Rf7 31.Qxd6 Rc7 32.Bd5+ wins decisive material.

Apr-09-16  morfishine: <28.Rd6>
Apr-09-16  gofer: This one is not "Very Difficult".

White forces an exchange down, for a passed pawn and from there forces an exchange of its queen, for two more pieces, gaining a secure passed pawn on the seventh rank and so enters into a won "2B v Q" end game - simples!

<28 Rd6 ...>

As Nc6 is pinned and white now has three pieces attacking the lonely knight, black must accept the rook sacrifice.

<28 ... Bxd6>
<29 exd6 ...>

At this point it is starting to dawn on black that white is happy to sacrifice Pd6, while it is on d6 (to win the poor knight), because attacking the pawn (and allowing Qxc6) at this point loses Pc5 (and Pb4)!

29 ... Rd7
30 Qxc6 Qxc6
31 Bxc6 Rxd6
32 Ba4

<29 ... Rc8>
<30 d7 ...>

Obviously losing the rook is a losing move...

<30 ... Rc7>
<31 Qxc6! Rxc6>
<32 Bxc6 ...>

click for larger view

White enters into a "2B v Q" end game. However, this clearly a win because the advance d pawn means the queen has to guard against its promotion and as soon as white pawn's promotion square is protected, by either the white king, another pawn or the DSB then the game is over.

<Would I have the technique to win this? I would hope so...>

I would guess the next few moves would be...

32 ... Kg7

This stops the threat of the promotion also being a check and allows f6 next to block the black diagonals to the king and promotion square d8 - if white tries to Bg5.

33 Ba4 anymove
34 Bxc5

At this point white has a second passed pawn and one that connect to the first, it would start to be doom and gloom for black from here, though I really have no idea what black will try to do to defend this position...



<prashant107: What after 29.ed6 Rd7? I didnt see a continuation for white.>

30 Qxc6 Qxc6
31 Bxc6 Rxd6
32 Ba4

The rook can't get to a square to protect Pc5 before Be3 has a chance to take it. Once Pc5 goes, Pb4 is next and black is deader than dead. So <29 ... Rc8> is necessary.

Apr-09-16  dfcx: 28.Rd6 forces black to trade bishop for rook, and gains a tempo

28...Bxd6 (or Rxd6 next wins) 29.exd6

Now black has a tough choice to make -
if the rook leaves the c file, the knight is lost, but if stays on the file, the passed pawn will promote.

A. 29....Rd7 30.Qxc6 Rxd6 31.Qxb6 Rxb6 32.Bxc5 wins

B. 29...Rc8 30.d7

B1 30...Rd8 31.Qxc6 Qa7 32.Bxc5 Qxd7 33.Qxd7 Rxd7
the result is similar but white gains an extra tempo here.

B2. 30...Rc7 31.Qxc6 Rxc6 32.Bxc6 now black can't stop Bxc5 followed by Bf7, the pawn will promote.

Apr-09-16  mel gibson: Ricardi was a genius to work such a chain of sacrifices out.
Premium Chessgames Member
  thegoodanarchist: puzzle of the day is great because not only do we get a nice puzzle to solve, we are often made aware of beautiful games that we wouldn't otherwise have seen.
Apr-09-16  catlover: This puzzle was beyond me, but it was beautiful to see the solution. I don't think I would have ever seen 31. Qxc6 as the winning follow-up move.
Apr-09-16  dfcx: Just saw from 2008,
<ToTheDeath: 40...hxg3 draws according to Rybka, the main point being 41.fxg3 Kg6! 42.c7 Qb2+ 43. Kh3 Qa1! and the threat of Qh1+ gives Black a perpetual.>

Not really, white should have played

42.Bb4 Qb2+ 43.Kf1 Qb1+ 44.Ke2 Qc2+ 45.Ke3 Qc5+ 46.Kxe4 Qxb5 47.d8=Q

and the game is won.

Apr-09-16  King Sacrificer: Black's defence was impressive indeed. I think game continuation is not the solution for the puzzle as a missed draw was mentioned here:

<ToTheDeath: 40...hxg3 draws according to Rybka, the main point being 41.fxg3 Kg6! 42.c7 Qb2+ 43. Kh3 Qa1! and the threat of Qh1+ gives Black a perpetual.>

Apr-09-16  RandomVisitor: After 27...Nc6

click for larger view


<+2.18/50 28.Rd6> Bxd6 29.exd6 Rc8 30.d7 Rc7 <31.Bf4> Rxd7 32.Qxc6 Qxc6 33.Bxc6 Rd8 34.Ba4 Kf8 35.Bg5 Ra8 36.Bf6 Ra6 37.Kg2 e5 38.Bxe5 Ke7 39.Bf4 f6 40.Be3 Kd6 41.Kf3 Ra7 42.Bh6 Ke5 43.g4 Ke6 44.Ke4 Ra8 45.Be3 Rc8 46.Bb5 Rc7 47.Bh6 Re7 48.Kf3 Rc7 49.Bc1 Rc8 50.Be3 Rc7 51.Ba4 Rc8 52.Ke4 Rc7 53.Bb5 Rc8 54.Kf4 Rc7 55.Kf3 Ke7 56.Bf4 Ra7 57.Ke4 Ke6

Apr-09-16  Patriot: 28.Rd6 was easy enough to find, but there was a bit more behind it. I considered 28...Bxd6 29.exd6 Rc8 30.d7 Rc7 and looked at several candidates. But first I considered 28...f5 but 29.Rxc6 fxe4 30.Rxb6 and game over. There is also the intermezzo, 28.Rd6 Bxd6 29.exd6 f5 but 30.dxc7 is game over.

31.Qxc6 Rxc6 32.Bxc6 Qd8 33.Bg5 f6 and things were not as clear. I also looked at 33.Bxc5 but I didn't see an immediate way to win. Too risky.

31.Bxc5 Qxc5 32.Qxc6 Rxc6 33.d8=Q+ etc. looked interesting because the queen no longer guards d8.

31.Bh6 (threatening 32...d8=Q+ 33.Nxd8 Qe5) looked very attractive to me. 31...Rxd7 32.Qxc6 Qxc6 33.Bxc6 .

This seems to be enough to decide on 28.Rd6 because there doesn't seem to be anything else to compare it with. And it seems perfectly safe because there are certain winning lines.

Apr-09-16  morfishine: Though it looks like Black could've drawn this game, this doesn't detract from the originality and imagination that went into the concept

Very nice


Apr-09-16  The Kings Domain: Good puzzle and good game. If only they were as easy as they are impressive. :-)
Apr-09-16  Granny O Doul: <scormus>I would call 33. Ba4 perhaps a tough find for a calculating machine, but not particularly for a human.
Apr-09-16  garrido: I believe who is better.
32 .....kg7. 33.- <bishop a7> and <bishop c8> and to have bishop bxc5 winning pawn
Apr-09-16  RandomVisitor: After 30...Rc7

click for larger view


+2.39/32 31.Bxc5 Qxc5 32.Qxc6 Rxc6 33.d8Q+ Kg7 34.Bxc6 Qxc6 35.Qd4+ Kf8 36.c5 Qb7 37.Qd6+ Ke8 38.c6 Qc8 39.Kh2 f6 40.c7 h6 41.Qc6+ Ke7 42.Kg1 Kf7 43.Kg2 Ke7 44.Kh2 h5 45.Kg2 Kf7 46.Qd6 Ke8 47.Kh2 Qd7 48.Qc5 Qc8 49.Qb5+ Ke7 50.Qc6 Kf8 51.Qd6+ Ke8 52.Kg2 g5 53.hxg5 fxg5 54.Kh2 h4 55.gxh4 gxh4

+2.03/32 31.Qxc6 Rxc6 32.Bxc6 Kg7 33.Bxc5 Qxc5 34.d8Q Qxc6 35.Qd4+ Kf8 36.c5 Qb7 37.Qd6+ Ke8 38.c6 Qc8 39.Kh2 f6 40.c7 h6 41.Qc6+ Ke7 42.Kg2 Kf7 43.Qd6 Ke8 44.Kh2 f5 45.Kh3 Qd7 46.Qa6 Qxc7 47.Qxe6+ Kd8 48.Qg8+ Ke7 49.Qg7+ Kd8 50.Qxg6 Qc5 51.Qxh6 Qxf2 52.Qf8+ Kd7 53.Qf7+ Kd6 54.Qc4 Qf3 55.Qxb4+ Ke5

+1.97/32 31.Bf4 Rxd7 32.Qxc6 Qxc6 33.Bxc6 Rd8 34.Bb5 Rc8 35.Bd7 Rd8 36.Ba4 Rc8 37.Be5 h6 38.Bf6 g5 39.hxg5 hxg5 40.Bxg5 Kg7 41.Kg2 Kg6 42.Be3 Kf6 43.Kf3 Ke5 44.g4 f6 45.Ke2 Kd6 46.f4 e5 47.fxe5+ Kxe5 48.Bd7 Rd8 49.Bf5 Kd6 50.Kf3 Rh8 51.Ke4 Kc6 52.Kf4 Rh3 53.Ke4

+1.49/32 31.Bg5 Rxd7 32.Qxc6 Qxc6 33.Bxc6 Rc7 34.Ba4 Kg7 35.Bd8 Rb7 36.g4 f5 37.g5 Kf7 38.Bf6 h5 39.Be5 Ke7 40.Kg2 Rb6 41.Bf4 Rb7 42.Kg3 Ra7 43.Be5 Ra6 44.Kf3 Ra8 45.Kf4 Rc8 46.Ke3 Ra8 47.Kf3 Ra6 48.Kf4 Ra8 49.Ke3 Rc8 50.Bb5 Ra8 51.Bf6+ Kf7 52.Ba4

+0.95/32 31.Bh6 Rxd7 32.Qxc6 Qxc6 33.Bxc6 Ra7 34.g4 f6 35.Be3 Rc7 36.Ba4 e5 37.f4 exf4 38.Bxf4 Rc8 39.Bd7 Rd8 40.Be6+ Kf8 41.Bd5 Ke7 42.g5 Re8 43.Kf2 fxg5 44.Bxg5+ Kd7 45.Be3 Kd6 46.Kf3 Re7 47.Bf4+ Kd7 48.Kf2 Re8 49.Bg5 Kc7 50.Bd2 Kd7 51.Kf3 Kc7 52.Kg4 Kd7

Apr-09-16  Dr. J: <"28. Rd6 Bxd6; 29.exd6 Rc8; 30.d7 Rc7; 31.Qxc6 Rxc6; 32.Bxc6 and wins the BBP vs. Q ending, because Black cannot stop the eventual Queening of the d-pawn">.

From the comments, this is what most of us (including me), and, I suppose, <cg> believed, but if <RandomVisitor>'s analysis is to be believed (and we don't have to - this sort of long-plan ending is still what computers are weakest at.) then this is a mistake and White's best is the unintuitive and, to me, unconvincing equal-material Q+P ending after <31.Bxc5 Qxc5; 32.Qxc6 Rxc6; 33.d8Q+ Kg7; 34.Bxc6 Qxc6; 35.Qd4+>.

If so, then, technically, this is another flawed ("botched") puzzle, but this time I am not unhappy, because this is such an interesting and educational position. My thanks to the commenters who have illuminated its hidden depths.

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