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Miguel Illescas Cordoba vs Hikaru Nakamura
Pamplona International (2003), Pamplona ESP, rd 6, Dec-27
Slav Defense: Quiet Variation (D11)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Oct-01-10
Premium Chessgames Member
  scormus: <Jim, Once> Makes you think, Hikaru was a true gentleman to resign when he did!
Oct-01-10  patzer2: For today's Friday puzzle solution, 54. Bd7+! decoys the Black Knight and allows a winning passed pawn after 54...Nxd7 and the immediate 55. hxg6! .
Oct-01-10  castle dweller: Thanks Once,

Nice analysis, that seems to be it. I was thinking that just maybe, if the black king were to linger around e6/f7 long enough to prevent white's B from getting to f8, it might be enough time to spring the black h pawn past h4 - and make the white K get far enough out of position that black could then do an end-around - but Black falls a move short. The second half of the puzzle was interesting to me though - and I had to try a couple of lines before I was certain of white's victory.

Oct-01-10  BOSTER: <rapidcitychess>. <54.Bd7+ Nxd7 55.exd7+ Kxd7 56.hxg6 Bf8...> Your mistake is 56...Bf8? Correct is 56...Ke6 and white can not win such position. Moves order in this puzzle is very important.
Correct 55.hxg6, creating a "wandering" square e6-g6-g8-e8.
Oct-01-10  wals: Near, but not near enough.

White with the well positioned Bishop pair and an impregnable pawn centre allowed no kamikaze attack.

Black's hopes of victory rocketed downwards with -
(+5.30):51...g6.
The next best on offer were:-

Analysis by Rybka 4 x64:depth 32: 20 min:

1. (1.08): 51...Nd7 52.Bd8 Nf8[] 53.Bc8+ Nd7 54.Bb6 Ke7[] 55.Bc7[] Ke6 56.Bd8 Be1 57.Bb6 Ke7 58.Bc5+[] Nxc5+[] 59.dxc5 Kd8 60.Be6[] Ke7 61.Bxf5[] Bf2 62.c6 Kd8 63.Be6 Bg3 64.Bxd5 Bxf4 65.e6 Bg3 66.Kc4 Bh4

2. (2.02): 51...Ba3 52.Bc8+ Nd7 53.Bd8 Bb4 54.Bb6 Ke7[] 55.Bc7[] Ke6 56.Bd8 Be1 57.Bb6 Ke7 58.Bc5+[] Nxc5+[] 59.dxc5 Kd8 60.Be6[] Ke7 61.Bxf5[] Bf2 62.c6 Kd8 63.Be6 Bg3 64.Bxd5 Bxf4 65.e6 Bg3 66.Kc4 Bh4

Black, more gloom; depth 25 : 4 min :
(+7.99):53...Ke8.
Best, Nxe6 +5.30.

Black cried sayonara move 55.

Oct-01-10  rapidcitychess: <dzechiel> I noticed that just now! I have found it much easier to start at rank 1 so, may I add, oops! Seems I forgot how to make FEN diagrams.

On the other hand, from what I can see, that line is won.

Oct-01-10  wals: Rybka 4x64, if play had continued,
quickie scan.

55.hxg6 Bf8 56.exd7+ Kxd7 57.Bf6 Ke6
58.g7 Bd6 59.g8Q+ Kxf6 60.Ke3 Be7
61.Qxd5 Ba3 62.Qe5+ Kg6 63.Qe6+ Kg7
64.Qxf5 Bb2 65.Ke4 (+#7)

Oct-01-10  EXIDE: Got this right. It has been a long while since I solved a 4 star puzzle. Fewer the pieces I am able to sort out the position,however with the board cluttered , not able to discard the bad from the good. Now to wait for the 5 star killer tomorrow.
Oct-01-10  VincentL: "Difficult".

I come to this puzzle late in the day.

The sequence I see is 54. Bd7+ Nxd7 (only move) 55. exd7 Kxd7 56. hxg6. Now black has two possible defences.

(a) 56.....Ke8 57. g7 Kf7 58. Bf6,

Now white can march his king to h5, then play Kxh6. Black must play Kg8 (to prevent white continuing Kh7 and g8=Q). Then white moves his king across to capture black´s pawn on f5.

Black can play Bd6 to complicate matters.

If black play Bd6 when white´s king is on h5, white continues Kxh6 and after black plays Bxf4 white continues Kg6 winning the f5 pawn and then moves across to capture the d5 pawn.

The resulting position, where white has 3 pawns to black´s one, is an easy win for white.

If black plays Bd6 when white´s king is on h4 white continues Kh5, an after black´s Bxf4 white plays Kg6 winning the f5 pawn. White must be very accurate to secure the win in this variation. White can capture black´s d5 pawn, and when black´s h pawn reaches h4 white must sacrifice his bishop for it. Thereafter white moes his king accross to the a/b files, exchanges black´s a pawn for his b pawn, and the resultant K + B + P v K + B pawn is won with care.

If black plays Bd6 when white´s king s on g3, I think the sequence in the strategy in the last paragraph still works, but white must be very careful not to lose a tempi.

(b) 56....Bf8 57. Bf6 Ke8. Now black must sacrifice his bishop for white´s g pawn. 58. g7 Kf7 59. g8=Q+ Kxf8 and with K+B+3P v K + 4P white wins the ending.

I don't know if there is an easier solution. Let´s check to see what happened in the game.

Oct-01-10  VincentL: I had the wrong move order. A much simpler win is afforded by playing 55. hxg6. Now black must play Bf8 resulting in my line (b) above - a simple(r) win (although one must heed <jimfromprovidence>´s comments).

The complications in my line (a) are avoided.

Oct-01-10  beginner64: The solution is really very simple. It was the question that was so difficult for me.

I am thinking of City Slickers. I sure could ask some of you to explain how to have thought through this answer, but I can imagine someone getting frustrated and saying: "Shut up! Just shut up! He doesn't get it! He'll never get it! It's been 4 hours! The cows can solve this puzzle by now! Forget about it please!"

Oct-02-10
Premium Chessgames Member
  Once: <beginner64> I wouldn't worry about it. I have found that the dumbest question of all is the one that I think about but don't ask.

I work with engineers (and I'm not an engineer myself) and every now and again they use a word that I just don't understand. At first, I didn't want to ask them what it meant because I didn't want to seem uneducated. But now I just ask the dumb question - "excuse me, what does that mean?" And it is surprising how many people say to me afterwards that they didn't understand either and were really glad that I had asked!

So how did we think through this answer? Start from the beginning position:


click for larger view

What is white trying to do? We are down to two minor pieces each, so it's unlikely that we are going to be mating black any time soon. There doesn't seem to be a tactic to win one of the black pawns or pieces. So we need to default to pushing pawns and trying to get a new queen.

The move 54. hxg6 is begging to be made, but if we do this straight away then black plays 54...Nxg6 and it's not clear how we are going to make progress. If the black knight wasn't on f8 than our move of 54. hxg6 would be a lot more powerful. The g pawn has a special advantage in this position - it queens on a light square which means that black's dark squared bishop can't cover the queening square.

There is another piece of chess knowledge that helps here. A lone king can find it very difficult to hold back two far advanced pawns. If he goes for one, the other promotes, and vice versa.

So that gives us our theme - deflect the black knight away from f8 then play hxg6. How do we deflect the knight? Well, it just so happens that 54. Bd7+ forces black to play 54....Nxd7 as it's the only way to get out of check.

It's about this time that an absolute beginner starts to panic: "But this just loses my bishop! I can't play this!" And it's when an experienced player says "Hmm... this is interesting. I might be losing my bishop but I have a chance to queen a pawn, which is worth much more."

And the rest is the hard work of checking variations. This idea looks interesting, but it may turn out to be total pants if black has a saving resource. So we need to step through each variation to make sure that our line works.

There is another cruder way, which is to examine every check and capture. The only check in the position is Bd7+, and examining this move should lead to the same conclusion. But I prefer to start by thinking in general terms about what I want to achieve from the position - which in this case is to play hxg6 without black being able to recapture with Nxg6.

Does that help?

Oct-02-10  rapidcitychess: <BOSTER> I covered that. Ultimately black loses anyway.
Apr-09-21  Walter Glattke: Didn't see this: 55.-Nc5+ 56.dxc5 Bxc5 57.g7 Bf8 58.g8Q B) 55.-Bf8 56.exd7+ Kxd7 57.Bf6 h5 58.g7 Bxg7 59.Bxg7 h4 60.Ke3 h3 61.Kf2 Kc6 62.Bf8 wins
Apr-09-21
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black threatens gxh5.

The knight protects the pawn on g6. This suggests 54.Bd7+ Nxd7 55.hxg6:

A) 55... Nb6(b8,f8) 56.g7 wins.

B) 55... Ne5+ 56.fxe5

B.1) 56... Kf8 57.e7+

B.1.a) 57... Bxe7 58.g7+ Kf7 (58... Kxg7 59.Bxe7 + - [B vs p]).

B.1.b) 57... Ke8 58.g7 Kf7 59.g8=Q+ Kxg8 60.e8=Q+ wins.

B.2) 56... Bf8 57.Bf6 h5 58.g7 Bxg7 59.Bxg7 h4 60.Bh6 h3 61.Bf4 with won ending.

C) 55... Kf8 56.exd7 Be7 57.Bxe7+ Kxe7 58.g7 wins.

Apr-09-21  Brenin: 55 Bd7+ deflects Black's N from its duty of protecting the g-pawn, forcing 55 ... Nxd7 and allowing White to create a passed pawn with 56 hxg. After 56 ... Bf8 57 exd7+ Kxd7 58 Bf6 Black will have to give his B for the g-pawn (<agb2002> has all the details), leaving White with B+3P vs 4P and a lengthy but straightforward win (see <Once>'s posting from 2010 for this).
Apr-09-21  Brenin: The combination actually starts with 52 Bc8+, following Black's blunder 51 ... g6, and this would have made a slightly tougher puzzle. Black was on the defensive, because his N has no good squares, but 51 ... Nd7 would have held the fort.
Apr-09-21  malt: Deflecting the Knight, 54.Bd7+ N:d7 55.hg6

(55.ed7+ K:d7 56.hg6 )

55...Bf8 56.ed7+ K:d7 57.Bf6 h5

(57...Ke6 58.g7 B:g7 59.B:g7 h5 60.Ke3 )

58.g7 B:g7 59.B:g7 h4 60.Ke3 Kc6
(60...h3 61.Kf2 )

61.Bf8

Apr-09-21  mel gibson: I wasn't sure -
after over an hour, Stockfish 13
still couldn't find mate.

54. Bd7+

(54. Bd7+ (♗c8-d7+ ♘f8xd7 h5xg6
♗b4-f8 e6xd7+ ♔e8xd7 ♗h4-f6 h6-h5 g6-g7 ♗f8xg7 ♗f6xg7 ♔d7-c6 ♔d3-e3 ♔c6-b5 ♗g7-f8 h5-h4 ♔e3-f2 ♔b5-c6 ♔f2-g2 ♔c6-d7 ♗f8-h6 ♔d7-e7 ♗h6-g5+ ♔e7-e6 ♔g2-h3 ♔e6-f7 ♔h3xh4 ♔f7-g6 ♗g5-d8 ♔g6-f7 ♗d8xa5 ♔f7-e8 ♗a5-e1 ♔e8-d8 ♔h4-g5 ♔d8-c8 ♔g5-h5 ♔c8-d8 ♗e1-d2 ♔d8-c8 ♔h5-g6 ♔c8-b8 ♔g6xf5 ♔b8-a7 ♗d2-b4 ♔a7-b8 ♔f5-g6 ♔b8-c8 ♗b4-d2 ♔c8-c7 f4-f5 ♔c7-b8 ♗d2-a5) +64.84/51 3696)

score for White +64.84 depth 51

Apr-09-21
Premium Chessgames Member
  chrisowen: Heart hiv Bd7+ honours amalgamate koinus hiv ajars botch taciturn heart hiv jacks lacks backs forth hiv hairy yin it nip backs pod mow gem gum quavered it is jocks ivory nefarious withins dithers luggy gaps bruise uvs-ray Ba3 gotcha arrive it ooh g6 factual accommodate ivory ado no huffy tot ups flagrant honour eh flush hot hiv down it tics Bd7+ bid;
Apr-09-21  JohnBoy: The analysis by <Once> on Oct-01-10 is right on target. In the puzzle position I didn't see the ultimate Bf8, but it does a lot of heavy lifiting.

My question - is hg6 necessary before ed7+ ? I don't see the difference.

Apr-09-21  JohnBoy: And <Brenin> is right - we could make a Saturday puzzle by asking for white's move 52. Everything else flows from there. The game is pretty damned good as Naka is always just holding it together until he can't.
Apr-09-21
Premium Chessgames Member
  perfidious: <JohnBoy....The game is pretty damned good as Naka is always just holding it together until he can't.>

About the way I felt when playing A Shaw vs A Ivanov, 2001 : my position seemed decent and I thought I was keeping it together, but as the time check neared, I sensed matters were, almost imperceptibly, taking a turn for the worse.

Apr-09-21  RandomVisitor: After 6...Bh5: 7.c5 and 7.Qf5 are worth a look


click for larger view

Stockfish_21033108_x64_modern:

<55/62 4:19:45 +0.12 7.c5> e6 8.Bd3 Nbd7 9.f4 Bg6 10.0-0 Bxd3 11.Nxd3 a5 12.Bd2 Be7 13.a3 0-0 14.Nc3 b6 15.b4 Qc7 16.Rfc1 Qb7 17.h3 Ra7

<54/75 4:19:45 +0.12 7.Qf5> Nbd7 8.Nxd7 Qxd7 9.Qxd7+ Nxd7 10.cxd5 cxd5 11.Nc3 e6 12.h4 Nf6 13.Bd3 Bg6 14.Ke2 Bxd3+ 15.Kxd3 h5 16.Bd2 Be7 17.Rhc1 b6

Apr-09-21
Premium Chessgames Member
  opus: 55...Bf8 56. Be7 Nf6 57. Bxf6 Bg7 58. Bxg7 Kd8 59. Bf6+ Ke8 60. Bg7 Kd8 61. Bf6+ Ke8 62. Bg7 3 move repetition
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