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Pablo Ricardi vs Nicolai Vesterbaek Pedersen
36th Olympiad (2004), Calvia ESP, rd 5, Oct-19
English Opening: Agincourt Defense. Catalan Defense (A13)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Oct-24-04  ConLaMismaMano: Wonderful game! And a very instructive endgame! 28.Rd6! and 31.Qxc6!! were two crucial moves.
Oct-27-04  Gowe: An incredible game played by Ricardi, beatiful mate combination. Very good nice 26. Rd6. It was the winning move.And then the queen sacrifice was perfect and gave the definitely victory to Ricardi. I think Pedersen should resing after the queen's sacrifice.
Nov-18-04  flamboyant: wow... thats a stunning game , beautiful sacrifice!
Dec-10-05  Counterpoint: What a beautiful end position! And extremely bold play by Ricardi.
Dec-10-05  Averageguy: Incredible sacrifice that illustrates that several active minor pieces combined with far advanced pawns is more then a match for a lone queen.
Apr-02-08  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  JohnBoy: Pretty obvious. Nice finish.
Apr-09-16
Premium Chessgames Member
  patzer2: This is a Saturday challenge I found easy only because I was prompted it was a difficult Chess puzzle. Also, here at chessgames.com, the weekend puzzle solutions typically start off with a combination involving early piece sacrifices.

Found 28. Rd6! easy enough and correctly played guess the move with the game continuation through 34. Bxc5 . However, after 34...Qd8, I deviated with 35. Bxb4 (+3.49 @ 22 depth, Deep Fritz 15) which also happens to be the computer first choice.

Black's game takes a turn for the worse with 23...Rxe4?! 24. Qxe4 (+0.56 @ 18 depth, Deep Fritz 15). Instead of making an unfavorable exchange, the computer suggestion of regrouping with 23...Rdd7 = or 23...Rdd8 = (-0.24 @ 22 depth, Deep Fritz 15) makes sense.

P.S.: One of the GMs providing instructional videos on my grandsons' chesskids.com account often advises young players to avoid exchanges unless they're in their favor. Maybe it would have been good advice for Black in this game.

Today I went through a moderately difficult endgame exercise with my seven-year-old grandson who now seems to have a good grasp of the intracacies of the Philidor Bishop and Rook versus Rook position number 46 from Pandolfini's "Endgame Course Book" (diagram below):


click for larger view

1. Ra7 Rc1 2. Rf7 Re1 (2... Ke8 3. Rf4 Rd1 4. Rb4 Kf8 5. Rg4 ) 3. Bf3 Re3 4. Bc6 Rd3+ 5. Bd5 Re3 6. Rd7+ Ke8 7. Ra7 Kf8 8. Rf7+ Ke8 9. Rf4 Kd8 (9... Rd3 10. Rg4 ) 10. Be4 Ke8 11. Bc6+ Kd8 12. Rf8+ Re8 13. Rxe8#

Apr-09-16  diagonalley: <al wazir> ... me too! (as usual)
Apr-09-16  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...

Apr-09-16
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.d8Q Qxc6, otherwise white would save one bishop with 35.Bd4+ first and only then promote to queen.
Apr-09-16
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
Premium Chessgames Member
  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...

~~~

Yep.

<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.
Apr-09-16
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.>

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