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|Nov-18-08|| ||who: 124.Rd8 lost. Nalimov gives Rf8 as the only drawing move (it allows 124.Rf8 Re3 125.Kg1).|
|Nov-18-08|| ||Eyal: R+B vs. R seems like one of the most difficult theoretical draws to hold in practice: Endgame Explorer: RB vs R; the list of players who failed to hold it at one time or another includes Reti, Bronstein, Olafsson, Hort, J. Polgar, Short (twice), Almasi, Grischuk, Ljubojevich, Van Wely and Rublevsky, so Leko is not in such bad company...|
|Nov-18-08|| ||madlydeeply: That's OK, Pete, it happens to the best of us. I once lost a R+N v. R ending...I was so happy to get to the "drawn" ending and then my smile turned into utter humiliation when I lost. Of course that was a 7 minute game on FICS and I'm a complete idiot but that's beside the point....|
|Nov-18-08|| ||Eyal: <I once lost a R+N v. R ending...>|
This should be easier to hold - Endgame Explorer shows only about 10% won by the attacking side, compared with about 40% in the case of R+B vs R; but anyone who loses it can still take comfort in Judit Polgar vs Kasparov, 1996 ...
|Nov-18-08|| ||Nezhmetdinov: I'm feeling you, <madlydeeply>... I'm that kind of fool too.|
|Nov-20-08|| ||Andrew Chapman: Is 38.Nxf6 any good for a draw?|
|Dec-08-08|| ||kingsindian2006: this is a grueling game... the winner deserves a point and a half i think..lol|
|Dec-09-08|| ||Resignation Trap: Photo of Peter getting pounded by Chucky in this endgame: http://www.chesspro.ru/_images/mate... .|
|Jul-04-10|| ||dzechiel: Black to move (124...?). Black is up by a bishop. "Insane."|
I think the only "insane" thing about this position is the effort that it took to get here.
The winning sequence from this point is fairly straight forward. We start with
The threat now is 125...Bh3+ 126 Kg1 Re8#. White has only one good way to stop this...
125 Rg8 Re5
Readying the rook for transfer to the h-file. Other than that, this move doesn't change the nature of the position, white must still maintain the pin of the bishop.
126 Rg7 Rh5
Now with the threat of 127 Rh1#. As this check cannot be blocked, the white king has to run for it.
127 Ke1 Rd5
Black could not make this move until the white king occupied e1, as white would then bring his own rook to the e-file and block the check. But that maneuver can no longer work, so white probably hangs it up here.
Time to check.
Yup, just slightly different squares for the rooks.
|Jul-04-10|| ||johnlspouge: Sunday (Insane)
Leko vs Ivanchuk, 2008 (124...?)
Black to play and win.
Material: R+B vs. R endgame. The endgame is usually a draw, if the defending R gets behind the attacking K to check. The White Kf1 has 1 legal move, g8, on the back rank, so Black has mating possibilities.
Candidates (124...): Rf2+, Ra2, Re3
[ 124...Rf2+ 125.Ke1 Kg2 126.Rg8, and Black has no threat]
[124...Ra2 125.Rd3+ Bf3 126.Ke1 Ra1+ 127.Kd2, and Black has no threat]
Black must create mate threats, while protecting his own Kg3.
124...Re3 (threatening 125...Bh3+ 126...Re1#)
125.Rg8 [Kg1 Re1#]
125...Rd3 ((threatening 126...Rd1#)
126.Re8 Rd1+ 127.Re1 Bh3+ 128.<Kg1> Rxe1#
I had failure of board vision, missing 128.Ke2. Congrats to those who found their way.
|Jul-04-10|| ||azax: A Sunday puzzle. Black to move. "Insane."
I believe most R+B v R positions are theoretically won, but take up to 57 moves to prove it. However, since we are not all computers and cannot calculate 50 moves into the future, these endgames often turn out pretty wacky. Given that was an "insane" puzzle, and I have never gotten a Sunday one in my history of perusing chessgames, I wasn't very confidant, but since endgames are my strongest point and I know a fair bit about this one, I decided to give it a try. Onto the position.
This lifts the black rook out of White's range and threatens 125. ...Bh3+ 126. Kg1 Re1# . White must play Rg8 (pinning the bishop). All other lines lose quickly, which I won't bother getting into. Black needs to find another way to threaten mate:
Here he threatens to move over to the h-file and deliver Rh1# . Kg1 still allows ...Re1#, so white must waste a move along the g-file (if the pin is broken, black still has the mate from ...Bh3+). There doesn't seem to be an important distinction between Rg5 and Rg6, though the Rg5 is not on the bishop's color, so this looks a little more appealing. The only legal move (besides sacking the rook pointlessly) to stave off the immediate mate is Kf1.
126. Kf1 Rh7 127. Kf1 Rd7
And now white must resign. ...Rd1 is mate whether or not the king moves over to g1. White lives the longest by 128. Rxg4+ Kxg4, but Leko didn't want, in addition to losing such a spectacular game, to insult Ivanchuk's intelligence by persisting without pieces against a rook.
If you're confused by some lines that I neglected to (or did) post, or my notation is wrong, just post and it'll be cleared up.
|Jul-04-10|| ||azax: Update: I was mistaken, most R+B vs R positions are theoretically drawn, not won.|
|Jul-04-10|| ||DarthStapler: I don't get this ending at all|
|Jul-04-10|| ||Once: The best offense is a good deeefense...
If ever I get bitten by a radioactive spider, accidentally irradiated by gamma rays, caught in a solar storm, or whatever, I really hope to get some decent superpowers.
You know, it would be great to have super strength like Mr Incredible, but without the facial and body masonry of the Thing or the unfortunate skin-tone and wardrobe malfunctions of the Hulk. Spiderman and superman have cool powers. I could even go for the bionics of the six million dollar man or the fiery antics of the human torch.
But the superpower than you really don't want, the joker in the pack, the sporty spice of powers is ... invisibility. HG Wells' version of the invisible man was permanently invisible, which meant that he had to go around dressed like king Tut so that people could speak to him. And, okay, I'm sure my inner teenager could find some use for invisibility, but that would quickly get boring and then what do you do?
Admittedly, Jessica Alba was somewhat scrumptious in the Fantastic Four, and they did give her a forcefield as well as invisibility. But it couldn't hide the fact that invisibility is, let's face it, a purely defensive power. It's like a super-duper version of running away very effectively. Not cool. Wimpy. Beige.
Mind you, you have to admit that invisibility does come in handy from time to time, even if it is only to see Jessica Alba in her underwear. So I guess the best superpower to have would be a mix of defense and offense. Muscles and a shield, like Captain America.
Today's solution sees black mixing offense and defense in equal measure, while white can do nothing except defend. Black needs to nudge white into a position where his rook cannot act as bodyguard to the king.
124...Re3 Defends against annoying side-checks from the rook. Threatens Bh3+, Kg1, Re1#.
125.Rg8 Defends by pinning the black bishop against the king.
125...Re7 (Re6 and Re5 also work). Now that white cannot side-check, black adds the option of going to the h file to his repertoire of threats.
126. Rg5 Effectively, a pass move. White has to maintain his pin on the bishop and 126. Kg1? Re1# is not much of an option)
126...Rh7 A new threat - Rh1#. But this is also a defensive move. If black played 126...Rd7 here, white would defend with 127 Re5 to block 127...Rd1+ with 128. Re1.
127. Ke1 The only move to defend against Rh1 mate. But now white's king has been dragged to a square where his rook cannot defend him.
127...Rd7 The killer threat of Rd1# cannot be avoided. Now the Re5/Re1 defence doesn't work, because the white king is parked on e1.
So there you have it. If you want to be macho in your cape and colourful tights, get a purely offensive superpower like superstrength or sticky fingers. If you want to be ultra pragmatic, choose powers which mix defense and offense. And if you want to be a wuss, a big girl's blouse (which I was called recently), then choose invisibility. The only superpower which has a natural affinity with pastel shades.
|Jul-04-10|| ||kelvi: Seems like 126. Rg6, instead of 126. Rg5 might save draw. For instance,|
126. Rg6 Rh7 127. Kg1 Re7 128. Rf6 ...
allowing for the interpose on Rank 1.
|Jul-04-10|| ||Once: Tut, tut, I am forgetting my manners!
Happy Independence Day to all of my friends on the other side of the pond.
|Jul-04-10|| ||Once: <kelvi> 126. Rg6 Rd7 and the black bishop prevents Re6. Fritzie says that white is busted after 124...Re3.|
|Jul-04-10|| ||Eduardo Leon: <124...e3>
This must be played on principle. Black prevents 125.d3+ and creates the threat 125...h3+ 126.g1 e1#. There is only one sensible way to stop this.
Ouch. Now black threatens mates in two both in the "d" and "h" files. White is paralyzed and can do nothing but keep his rook in the "g" file...
... so the mate in two threat becomes a mate in one threat.
Using the <other> mate in one threat! Now that the king is in e1, white cannot bring his rook to the defense of the king. The only way to stop the mate in one threat is...
And winning this endgame is basic theory.
|Jul-04-10|| ||lost in space: 4!:0!
What does that mean for a potental match Eng-Arg? 1 : 0 or 2: 0?
|Jul-04-10|| ||Once: <lost in space>
Germany played very well in both games. They are clearly in a different league to both England and Argentina and now my favourites to win the world cup.
It is interesting that the pre-tournament hype was about the so-called star players - Messi, Ronaldo, Rooney, Tevez, etc. But it seems that the bodysnatchers have got to them already and sent along mediocre dopplegangers instead. I wonder if the WAGs / FUFs have noticed the difference or they too have been taken over? Mark my words, there are alien pods in expensive houses all over the world...
The teams who are doing well are those with arguably less stellar players but who are playing as a team. There's a chess analogy in there somewhere that I might explore one of these days!
Mind you, I do feel sorry for Ghana.
|Jul-04-10|| ||Eduardo Leon: <There's a chess analogy in there somewhere that I might explore one of these days!>|
Yes, a few well-coordinated pieces can be worth more than a lot of material.
Morphy vs Duke Karl / Count Isouard, 1858
J S Neto vs Kasparov, 1981 (the sidelines 42.h1 xe3 43.fxe3 dxg2 44.xg2 g3 and 42.h1 xe3 43.e6 xf2 44.gxf3 f1+ 45.h2 exf3 46.xg5 f4#)
<Mind you, I do feel sorry for Ghana.>
Being South American myself, I acknowledge Ghana deserved to win more than Uruguay. But such is soccer, and such is life.
|Jul-04-10|| ||lost in space: Hi Once,
"bodysnatcher and Doppelgänger", good one! :-)
You are right, the superstars are not performing well so far. There is only one remaining, and also he is not that good as in the past: Torre. Or are Robben and Schweinsteiger seen as a superstars already?
For me there are 4 favorites left, and the most impressive one is Netherlands (Germanyx is playing very attractive, Netherlands is playing very effectiv)
And it should not be neglected: Every game starts with 0:0; After the game is before the game; The next game is always the most diffcult one.
So, now I have to pay 5 Euros for all that phrases. :-)
BTW: I agree with you that the team has to be the superstar. How we get a superstar-team when playing against UMAN next time?
|Jul-04-10|| ||dakgootje: invisibility would be good offensively because you don't have to worry anymore about defense and thus could fully focus on the offense -- like going-Tal without the problem that saccing all your pieces might mean a loss.|
On the other hand, it completely loses it's function when the opponent has those heat-seeing glasses or echo location or similar. And considering supervillains are by default extremely rich, you can take for granted they have such devices.
Teleportation would be good though - even offensively: grab a guy, teleport to open sea and bye-bye!
What was the downside of Captain America though? Practically all superheros have one major flaw.
|Jul-04-10|| ||Once: <dakgootje: What was the downside of Captain America though? Practically all superheros have one major flaw.>|
Now that's a tough one. He has been engineered to be the perfect soldier in every way and his shield is indestructible.
After much research (okay, I looked it up on wikipedia!), I finally found a fatal flaw for Captain America. He cannot get intoxicated by alcohol. Which kind of misses the point, doesn't it?
|Jul-04-10|| ||JeremyBrowne: <dzechiel> Black's 125th is important. For instance, 125.. Re7 is more accurate than your suggested 125... Re5 because it stops the following:|
125...Re5 126. Rg7! Rh5 127. Kg1 Re5 128. Rf7 Re1+ 129. Rf1.
I think Black still wins, for instance by playing something like Re2, Bf3, Rg2+, Rh2 and Rh1+ either mating or winning the rook, but the point is the win is not as clean.
The point is playing Re7 stops the rook being able to get to f1 because the bishop controls the crucial squares.
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