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| Jul-27-04 | | patzer2: Geller's 20. Nd6!! prepares a pretty double piece sacrfice after 21. Nxf7!! and is the solution to number 1703 in Chess Informant's 1980 Encyclopedia of Chess Middle Games/Combinations. It is classified under the theme "Demolition of Pawn Structure" via "Sacrifice on f7 (f2)." If 20...Rf8, then White wins after 21. Bxe7 Qxe7 22. Nxc8. If 21...Kxf7, then White has a quick mate with 22. Nxg5+ Kf6 (22...Kf8 23. Ne6+  ; 22...Kg8 23. Qb3+! ) 23. Nh7+! Ke6 (23...Kf7 24. Bd3+ Nd5 25. Qxd5+ Ke7 26. Qe6#) 24. Bd3+ Nd5 25. Qxd5+ Ke7 26. Qxf7# |
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| Aug-26-05 | | Raskolnikov: With 15.c5! Geller sacrificed a pawn but opened d-file and a4-d7 for his bishop. Black position after 18.♗g5 is already critical: for example 18...♕c7 19.c6! or 18...♗f6 19.♘e4 ♗:g5 20.♘f:g5 ♘f4 21.♗b3 ♘e6 22.♘:e6 fe 23.♕d6 ♕e7 24.c6! |
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| Oct-23-06 | | notyetagm: What a game by Geller this is. It even includes the threat of <Philidor's Legacy>! |
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| Oct-23-06 | | notyetagm: 16 c5!, 20 ♘d6!!, 21 ♘xf7!!
Wow.
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| Oct-23-06 | | notyetagm: <patzer2: ... If 20...Rf8, then White wins after 21. Bxe7 Qxe7 22. Nxc8.> Yes, 20 ♘d6!! embarrasses the Black e8-rook, gaining a tempo to attack the Black c8-bishop which <DEFENDS> the <LOOSE> Black d7-knight. If Black then saves his rook with 20 ... ♖f8, then after 21 ♗xe7 ♕xe7 Black loses a piece to the simple <REMOVAL OF THE GUARD> by <SUBSTITUTION> 22 ♘xc8 ♖xc8 23 ♕xd7. 20 ♘d6!! ♖f8? 21 ♗xe7 ♕xe7 22 ♘xc8 <removes the guard by substitution> ♖xc8 23 ♕xd7 |
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| Sep-29-07 | | Aspirador: This game is sometimes considered to be Geller's masterpiece, but nobody here mentioned the following strange fact: 16.d6! simply wins a piece with almost no compensation for black. Somehow spoils the beauty of the rest of the game. |
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| Sep-29-07 | | Shams: perhaps insufficient compensation but I wouldn't say almost none-- 16.d6 Nf5 17. exf5 gxf5 and the threat of ...f4 means white can't take on c5 immediately. clearly Geller saw 16.d6 and liked the text better. |
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| Apr-14-08 | | ToTheDeath: There's such a thing as cashing in too early. 16. d6 b5! 17. Bb3 c4 gives Black reasonable compensation- Rybka asseses it as only +.55 for White, whereas in the game White kept all his trumps and virtually forced Black into the winning combination. Geller's play was amazingly accurate and holds up well under computer analysis. |
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| Aug-08-08 | | zooter: Usually, I don't attempt fridays, but I think
20.c6 would be a good move with the idea of 21.c7
After 20.c6 bxc6 21.Bxc6 Rb8 I don't really know what I would do...time to peek |
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| Aug-08-08 | | zooter: absolutely brilliant moves by Geller...never saw it... |
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| Aug-08-08 | | PinnedPiece: <zooter: Usually, I don't attempt fridays>
Welcome to Satruday. This is posted 12 midnite FLA time. :) |
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| Aug-08-08 | | lost in space: Took a while to find the right idea:
20. Nd6 hxg5
(or 20...Rf8 21. Bxe7 Qxe7 22. Nxc8 Rf(a)xc8 23. Qxd7 ) 21. Nxf7 Kxf7
(or 21...Qa5 22.Bxd7 Bxd7 23. Qxd7 Kxf7 24. Nxg5+ Kg8 25. Qe6+ ) 22. Nxg5 Kg8
(or 22...Kg8 23. Qb3+ maybe even mate soon)
23. Ne6+ Kg8 24. Nxd8
If this was a friday, what will they come up with on Sunday? Time to check |
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| Aug-08-08 | | dzechiel: White to move. Black is up a pawn. "Difficult."
OK, I must be missing something. The first think I'm seeing is 20 Nd6 threatening the 21 Nxe8 as well as 21 Nxc8 followed by 22 Bxd7. But this is too easy for "Difficult", so there's either a cook to this line, or there's something better to be found. OK, I have finally gotten around to noticing that white's bishop on g5 is under attack. This should have an effect on my analysis. I'm really coming up empty here. Let's look at some candidate moves for white: - 20 Bxd7
- 20 Nd6
- 20 Qb3
- 20 Qd6
- 20 Bxe7
- 20 Bxh6
The problem with many of these moves is that they are not forcing, and I don't know what white would do if black didn't take the bait of the g5-bishop. If it was a blitz game, I would play
20 Qb3
as black would be tempted to play
20...hxg5 21 Nfxg5 Rf8 22 Nd6
and it looks like white is getting quite a bit of pull for his piece. But I'm not seeing anything concrete here, and I'm content tonight to turn over all the cards and peek at the game score. Time to check. |
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| Aug-08-08 | | dzechiel: Wow, this DID seem difficult. I'm glad I threw in the towel when I did. This does not bode well for the weekend. |
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| Aug-08-08 | | Slurpeeman: I considered 20. Bf6 for a moment, but if Black declines the sacrifice, that move is not very effective. It's curious that White has quite a few pins on Black's pieces. Many combinations to consider. I got Nd6, but didn't look at all the lines. I thought if 20...Rf8 then 21. Nxc8 Rxc8; 22. Qxd7 Qxd7; 23. Bxd7, with a very clear advantage (not to mention being up a piece) |
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| Aug-08-08 | | Hector Maluy: <dzechiel: Wow, this DID seem difficult. I'm glad I threw in the towel when I did. This does not bode well for the weekend.>
I also "threw in the towel" quickly. I was looking for: 20)Bxh6. If 20)..Bxh6 21)Bxd7 followed by 22)Nf6+, and that's it! :( |
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| Aug-08-08 | | newzild: Hmmm. This is strange. I saw the solution within 20 seconds. And everyone else here seems to have struggled with it. I think because the first thing to think about is Philidor's Legacy, which usually pops into my mind first when there are knights hopping around the king and the possibility of getting the Queen onto the a3-g8 diagonal.
I certainly don't think Nd6 deserves two exclamation marks... |
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| Aug-08-08 | | lost in space: Just saw a typo in my first post today:
22. Nxg5 Kf8 (and not Kg8; this move is handled below) (or 22...Kg8 23. Qb3+ maybe even mate soon) |
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Aug-08-08
 | | al wazir: The difficulty here is that there are too many candidate moves (I considered at least ten), and as <dzechiel> says, none of them look particularly forcing. I thought 20. c6, threatening 21. c7, was especially cute, but it doesn't go anywhere. I eventually settled for 20. Bf6. But after 20...Nxf6 (not 20...Bxf6 21. Bxd7 Bxd7 22. Nxf6+) 21. Nxf6+ Bxf6 22. Bxe8 Qxe8 23. Nxe5, there's no win. After 20. Nd6 white is still a long way from home. There's a lot of slip (or slop) twixt the cup and the lip, and a lot of alternatives to analyze. |
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Aug-08-08
 | | LIFE Master AJ: Absolutely outstanding!!!
I should annotate this game and place it on my website. "I certainly don't think Nd6 deserves two exclamation marks... " I am a a master, and I analyzed for over ten minutes, and I also did not get the whole solution. If Nd6 is sound, I would say it deserves THREE exclams ... but two might do the job! |
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Aug-08-08
| | al wazir: <newzild: Hmmm. This is strange. I saw the solution within 20 seconds . . . the first thing to think about is Philidor's Legacy.> "Hmmm" is right. Just what *did* you see? There is no smothered mate in this game, nor was one threatened at any time. |
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| Aug-08-08 | | Gilmoy: I saw all kinds of goofball ideas, mainly setting up Nf6+ to collect a lobster on d7. But 20.Bxh6 <deflection sac> Bxh6 eventually drops an exchange at c1. (Also, Black could just counter-sac with 20..Bh8!) After about 30 seconds, I noticed the fantasy sequence 20.Nd6 21.Nxf7, with the follow-ups (B,Q)b3+ to flush the K. We've all seen wacky sacness at weak f7, e.g. Botvinnik vs Portisch, 1968 and Kupreichik vs A Planinc, 1970. I lacked time to calculate the lines in detail -- I did only a quick static eval for telltales like follow-up checks, half-open h, White's good piece flow, and Black's congestion. White's position is like a coiled spring, very similar to other thunderbolt demolition sac wins. I quickly felt that this had to be the right idea. Perhaps it's lazy one way, but towards-enlightenment another way: Use the Force! Leap, don't grind! Trust your feelings! More practically: it's probably a wise meta-technique to train for a two-tiered eval, e.g. quick 1st pass in 10-30 seconds to see if it's promising enough to justify a deep 2nd pass of 15-30 minutes. Rarely, your intuition gets so accurate that you take the plunge, and spend your 2nd pass on <your opponent's> clock. In the <ahem> words of Julius Tal: "Veni, vidi, sacci, cogiti -- in that order". |
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| Aug-08-08 | | lost in space: LIFE Master AJ wrote: [snip] I analyzed for over ten minutes, and I also did not get the whole solution.> [snip] This took me round about 25 minutes of intensive analysing. Never ever had that for a friday puzzle. And is was pure luck that I started with Nd6, so no waste of time with the other (many ) candidate moves. |
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| Aug-08-08 | | Once: The opening position makes a striking impression. Black's knights on e7 and d7 are pinned in several directions. They block in the black pieces and do nothing to protect the sixth rank. What's more we have two tempting weak squares to fantasise over. The Capablancas amongst us will dream about a knight outpost on d6. The Tals and Alekhines will want to sink their teeth into f7. because black's pieces will struggle to come to the aid of the black king. Then the Petrosians note that the Bishop on g5 is under threat. My first thought is the positional 20. Bxe7 Qxe7 21. Nd6. Rescues the bishop, grabs one of the sexy squares for a knight outpost. But I'm not too convinced - I seem to be helping black to untangle his poor pinned knights. This is CG, so let's be a little more tactical. Try reversing the order and leaving the bishop to its fate. 20. Nd6 hxg5 21. Nxf7 - the knight is immune because of Nxg5+ and Qb3 and white will surely get mated or lose his queen to a knight fork. After 21. Nxf7, the queen has to move, but where? Here my logic started to get fuzzy - and my visualisation was failing. I have threats like N(7)xg5, N(3)xg5, Qb3 and if the queen moves too far from the defence of the e7 knight, Bxe7. Seems to be enough to justify sacing a bish for two pawns. As usual, didn't see to the end of the gamd - the variations got too complicated. <dzechiel> It can be counter-productive to think along the lines of "too easy for a friday" or (thinking about earlier this week) too difficult for a Tuesday. These puzzles are already artificial in that we know there is a tactical shot in there, so we are prepared to spend time looking at them. I think it makes it doubly artificial to add in other information that the players did not have - eg that it would end up as a Friday puzzle on CG! Mind you, it's hard not to think like this - to deny something that we already know. I used the fact that this is a CG puzzle to look for a tactical rather than positional move. |
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| Aug-08-08 | | amuralid: I thought about 20. c6 for a long time but could not find a forced win. :( |
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