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06-10-2009 , 07:27 AM
#26
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Quote:
Originally Posted by Ajezz

Here it is though:


White to move (Lucena position)
Solution:
Spoiler:
I know you're supposed to "build a bridge" here, but Im not sure exactly how to do it. I know that the general idea is to have the king between the rook and the pawn on the E file to block checks from the black rook.
It should go something like: 1. Rg1+ Kh7 2. Rg5 Re2 3. Kf7 Rf2+ 4. Ke6 Re2+ 5. Re5 wins the game.
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06-10-2009 , 07:49 AM
#27
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the Kazantsev study's really nice. solved it too, woot
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06-10-2009 , 07:54 AM
#28
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Quote:
Originally Posted by hoyasaxa
Solution:
Spoiler:
I know you're supposed to "build a bridge" here, but Im not sure exactly how to do it. I know that the general idea is to have the king between the rook and the pawn on the E file to block checks from the black rook.
It should go something like: 1. Rg1+ Kh7 2. Rg5 Re2 3. Kf7 Rf2+ 4. Ke6 Re2+ 5. Re5 wins the game.
I think it's more precise to build the bridge on the 4th rank, because on the 5th rank the black K could attack the R.
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06-10-2009 , 08:07 AM
#29
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Quote:
Originally Posted by bigpooch
Since there are so many studies on rook endgames, here's an "easy" one....


Gunst (1946) [ BTW, Gunst also composed in the same year (1946) the bishop ending posted ITT. ]

White to play and win.



It's interesting to note that if the pawn and rook are shifted to the right one file, all king moves win whereas in the position above, there is a unique move that wins.
I've always sucked at studies, but isn't this rather straightforward?

Spoiler:

The black rook is tied to h7 and the black king is tied to the h-file. If White gets his king to g6 he wins. So when White starts walking his king towards g6, the black king must follow on the h-file to protect g6. Checks by the rook don't bother White, because they only accelerate the king march.

Ok, so 1.Kc2 Kh2 2. Kd3 Kh3 3.Ke4 Kh4 4. Kf5 Kh5 - now White can't access g6 but with 5.Tf8 he either queens the pawn or gives mate by Rh8.


Edit: Added spoiler tags... sorry...
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06-10-2009 , 08:31 AM
#30
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Quote:
Originally Posted by Viikatemies
I've always sucked at studies, but isn't this rather straightforward?

Spoiler:

The black rook is tied to h7 and the black king is tied to the h-file. If White gets his king to g6 he wins. So when White starts walking his king towards g6, the black king must follow on the h-file to protect g6. Checks by the rook don't bother White, because they only accelerate the king march.

Ok, so 1.Kc2 Kh2 2. Kd3 Kh3 3.Ke4 Kh4 4. Kf5 Kh5 - now White can't access g6 but with 5.Tf8 he either queens the pawn or gives mate by Rh8.


Edit: Added spoiler tags... sorry...
Yes, this is "straightforward" or "easy". I included this study because the composer was already featured ITT and there were so many rook endings.

BTW, all the best ( may you play well! ) in the chess tournament!
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06-10-2009 , 08:58 AM
#31
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White to move (Nunn 1999)
A very simple position which is surprisingly difficult to win.
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06-11-2009 , 12:46 AM
#32
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Quote:
Originally Posted by Ajezz


White to move (Nunn 1999)
A very simple position which is surprisingly difficult to win.
Quite difficult.

Spoiler:

It may be useful to note that the position with kings on f5 and f7 is a mutual zugzwang. Since the analysis was a bit tedious, I simply looked it up; the main line looks like:

1. Kf4! Kf8 2. Kg4! Kg8 3. Kh5 Kh7 4. Kh4 Kh8 5. Kg3!
a) 5...Kg8 6. Kg4 Kf8 7. Kh5! Kf7 8. h4 with the idea of Kg6+-
b) 5...Kh7 6. Kf4 Kg6 ( 6...Kg8 7. Kg4 see a) ) 7. Kg4 Kf7 (7...Kh7 8. Kf5) 8. Kf5+-( with Kg6 )

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06-11-2009 , 08:23 AM
#33
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Here's a nasty "modern" study (modern in the sense having an endgame tablebase is almost necessary for its composition) from chessvibes.com (Weekly Endgame Study #122). Has chess composition reached depths only very few can fathom?

S. Didukh (2005)

White to play and win. ( "Almost impossible" to solve. )


Spoiler:

From the Nalimov endgame tablebases at http://www.k4it.de/index.php?topic=egtb&lang=en; by "box" I mean the "Informatorspeak" of the "box" or "quad" of "only move":

1. d4 Nd5 (obviously to trap the Na8) 2. Ba1! (box) Ke4 (best try) 3. Kh1! (box) Kf5 4. Kg2! Kf4 5. Kh3! Ke4 6. Kh2! (box) Kf3 7. Kg1 Ke3 8. Kf1 Kf3 9. Ke1 Ke3 10. Bb2 Kd3 11. Kf2! Kc2 12. Ba3 Kd3 13. Bc5 Ke4 14. Ke1! (box) Ke3 15. Ba7 Kd3 16. Kf2! Ke4 17. Bc5 (box) Nf4 (best try) 18. Nc7! (box; to be able to guard the pawn at c5 with Na6) Nd3+ 19. Kg3 Ke3 20. Kg4 Ke4 21. Bb6 Nf2+ 22. Kg5 Nh3+ 23. Kh4 Nf4 24. Kg4 after which each of 24...Ng6, 24...Nd3, 24...Ne2 and 24...Ng2 lose in no more than 24 moves.

Is chess complicated?

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06-11-2009 , 09:13 AM
#34
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Bigpooch, am i on the right track with the van Tert study? Can't find it anywhere. If you don't intend to post the solution here soon, pls pm me.
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06-11-2009 , 09:39 AM
#35
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Quote:
Originally Posted by Noir_Desir
Bigpooch, am i on the right track with the van Tert study? Can't find it anywhere. If you don't intend to post the solution here soon, pls pm me.
Yes, you basically have the right idea.

1. g8R! (1. g8Q? Bb7+ 2. Qg2 Be4 as you noted and obviously 3. Qf3 Bxf3+ 4. gf3 Kf2 mates in the same way) Bb7+ 2. Rg2 = and now 2...Ke4 simply 3. Rxh2 =. This also answers a question: Are there positions where underpromotion to a rook (or bishop) instead of a queen draws instead of loses?

BTW, was the Platov study I posted the one you were shown? ( It's a rather well-known study. )
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06-11-2009 , 09:50 AM
#36
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Yep, that was the study i meant.

I saw 3. Rxh2 too but then it was too late to edit my post Was a nice study but the key was a bit too obvious (ok, it's not g8Q because it's a study lol, then what else).
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06-11-2009 , 02:48 PM
#37
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Quote:
Originally Posted by bigpooch
Quite difficult.

Spoiler:

It may be useful to note that the position with kings on f5 and f7 is a mutual zugzwang. Since the analysis was a bit tedious, I simply looked it up; the main line looks like:

1. Kf4! Kf8 2. Kg4! Kg8 3. Kh5 Kh7 4. Kh4 Kh8 5. Kg3!
a) 5...Kg8 6. Kg4 Kf8 7. Kh5! Kf7 8. h4 with the idea of Kg6+-
b) 5...Kh7 6. Kf4 Kg6 ( 6...Kg8 7. Kg4 see a) ) 7. Kg4 Kf7 (7...Kh7 8. Kf5) 8. Kf5+-( with Kg6 )
Spoiler:
That's right. Another point is that the position after Black's 2nd move would win for White if it was Black's move, therefore the strange Kh5-h4-g3 manoeuvre avoiding g4.
And if in your line a) Black plays 6...g6 then 7. Kf4 Kf7 8. Ke5 Ke7 9. h4 +-.
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06-30-2009 , 09:08 AM
#38
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White to play and draw.
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06-30-2009 , 09:14 AM
#39
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I saw an endgame study a few months ago where the solution involved the 'defending' side promoting to a knight multiple times to stave off mate, only to get mated in the end. I've been looking for it ever since. Does anyone here know what I'm talking about?
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06-30-2009 , 09:41 AM
#40
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I think Suba (a very nice guy btw) showed a friend of mine the study you are talking about, claiming that it was a position where Tartakower resigned against Tarrasch, and a Soviet miner who taught himself chess found the win for him after analysing the position after work every evening for 15 years. The story, while fun, is almost certainly made up. I'll try to dig up the position and post it here.
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06-30-2009 , 10:53 AM
#41
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Quote:
Originally Posted by swingdoc
I saw an endgame study a few months ago where the solution involved the 'defending' side promoting to a knight multiple times to stave off mate, only to get mated in the end. I've been looking for it ever since. Does anyone here know what I'm talking about?
Well, there could be more than a dozen of these studies!

One of the most "famous" studies ( meeting your specifications ) that has received much attention can be found at the link:

http://www.chessbase.com/puzzle/puzz16b.htm

For convenience, one modified "corrected" version ( the other method of modification is moving the Black Ng5 to e5; the original flawed attempt had no White pawn on h2 ), submitted by Roberto Balzan ( the original composition by Gijs van Breukelen was flawed ) is below:

White to play and win



Spoiler:

One main line is: 1. Nf6+ Kg7! 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8Q Nf7+ 5. Ke6 Nxd8+ 6. Kf5 e2 7. Be4 e1N 8. Bd5! c2 9. Bc4 c1N 10. Bb5 Nc6 11. Bxc6 Nc7 12. Ba4 Ne2 13. Bd1 Nf3 14. Bxe2 and 15. Bxf3#
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06-30-2009 , 12:08 PM
#42
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That looks like the one i was referring to.
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07-02-2009 , 04:02 PM
#43
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Quote:
Originally Posted by jd_poker


White to play and draw.
Okay, I get the "joke"! [ BTW, this is very difficult! ]

Spoiler:

Three knights against a lone king is usually a win, but not always; e.g.,



which is a possible finale. IMHO, what makes this study difficult is to notice that 1. Ng1! Ne3+ 2. Kh3! is the only move and that 2. Kh2? loses to 2...e1N! ( not hard to see, but hard to prove! I simply looked this up. Three knights against a lone knight is very often a win, but sometimes a draw; since this doesn't seem like an exception, analyzing it would seem unnecessary, although if pressed, one could produce some variations ).

1. Ng1 Ne3+ 2. Kh3! Nf4+ 3. Kh2 Ng4+ 4. Kh1 Nf2+ 5. Kh2 e1N 6. Nf3+ ( after 6. Kg3?, both 6...Ke3 and 6...Ned3 win in a 3N vs N ending ) 6...Nxf3 7. Kg3 leads to the above diagram.
Last edited by bigpooch; 07-02-2009 at 04:08 PM.
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07-02-2009 , 06:30 PM
#44
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that one is very cool, I got the general idea but based on your spoiler I'm glad I didn't try to solve all the lines.
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