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Apr-01-09
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| Marmot PFL: Would be a good Monday puzzle. |
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Apr-01-09
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| kevin86: This is dead easy-Castle Queen Side with check and capture the rook next turn. |
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Apr-01-09
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| dzechiel: <newzild: Further to <dzechiel>'s mention of an Averbakh game in which the Grandmaster didn't realise a rook can castle over an attacked square, I recall Tal saying that Korchnoi once had to ask a tournament director about the same rule in a very important tournament.> <newzild> is on the right track here. In the game referenced above, Korchnoi's rook was under attack (presumably from a bishop or queen) and he asked the TD if he could still castle using that rook. |
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Apr-01-09
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| KingG: <newzild>, <dzechiel> Yes, this was the game in question: Korchnoi vs Karpov, 1974. |
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Apr-01-09
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| A.G. Argent: And here's where Mr. NN really gets sucker punched with a 0-0-0#. You'd think he'd learn.
A Kvicala vs NN, 1875 |
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Apr-01-09
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| YouRang: Well, like most others I presume, I spotted 11...O-O-O+ quickly. I don't if it's easy because of April Fools, or if they just thought it was trickier than it was. A good "April Fools" puzzle should have been some spoiler where it looks like an easy solution, but it really leads to a deadly counter-attack. I don't suppose puzzles like that are so easy to find though. :-) |
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| Apr-01-09 |
| tivrfoa: For me you couldn't castle if there's an opponent piece threating the path between the rook and the king. |
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Apr-01-09
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| zenpharaohs: This must have been the fastest I've ever spotted a move in one of these, and there have been a couple other really fast ones. I forced myself to then spend time looking for a mate, since once I find a win, I have a natural tendency to stop inspecting other possibilities. I suppose the April Fool was that there wasn't another move to find. |
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Apr-01-09
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| swordfish: Not difficult, but really cute. |
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Apr-01-09
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| Marmot PFL: <A.G. Argent:> The only problem with that example is that Rd1+ is also mate. |
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Apr-01-09
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| zanshin: This feels like a Monday puzzle. |
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Apr-01-09
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| Jedzz: Since this puzzle was so easy, here is a true Wednesday puzzle to solve:
click for larger viewWhite to move and mate in 6. |
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| Apr-01-09 |
| Kwesi: <<TheTamale>:Also, I moved the pieces around instead of doing it in my head. Is that cheating?> Yes. |
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Apr-01-09
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| hedgeh0g: A simple puzzle, but unless you play through the game, you have to assume Black still has qside castling rights. Somewhat trivial, I know, but I just thought I'd make the comment. |
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Apr-01-09
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| patzer2: <Jedzz><puzzle> 1. d4. |
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| Apr-01-09 |
| number 23 NBer: <Jedzz> I suppose the concept is a little difficult, but if you play it out over the board, all moves are the only legal moves. |
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Apr-01-09
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| GreenFacedPatzer: <Jedzz>
I must congratulate you on that profound puzzle. Many, many times, I've felt I solved a puzzle without completely working out every variation. But this is the first time I worked out every variation, clear to the checkmate, without feeling that I solved the puzzle. In fact, if it had been possible to make a wrong move, I am certain I would have done so, but the puzzle was so constructed that I found myself unable to go wrong. I thus acheived the checkmate without seeing it coming, planning for it, or anticipating it in any way. Well played, sir. |
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| Apr-01-09 |
| ruzon: The quickest way to explain the rule is that the King cannot castle out of check, into check, or through check. Nobody has mentioned that we had a similar puzzle a long time ago, only it was White who played O-O-O+. I can't find it, though. |
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| Apr-01-09 |
| WhiteRook48: 11... 0-0-0+ easy |
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| Apr-01-09 |
| gauer: <<patzer2> ... a good discussion of castling rules ... >
A "traditional" way of describing a to castling motion is: K -> over two squares, followed by R fills in the gap (so long as both unmoved pieces wishing to move - King's original first move used to be that he had a leap of two squares, much like a Kt, with some variations that the K might not move at all in the game until he was checked once - are not going into, exiting or through a check). Therefore, does white have a case that black cannot play 11 ... 0-0-0+ since K@e8->d7->c8+R@a8->d8 would be considered a path "through" a checking square?! <winks> Also, does the K necessarily have to wind up at c8 or f8 during the end of castling, & can the Rook wind up at the gap-filling sqaure of d7 in the hypothetical case above, not moving laterally like a traditional Rook on the same move? Also, if white had a Knight on d8 in the above game, is black allowed to make a capture of it, either with K or R, as part of castling?! |
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| Apr-01-09 |
| gauer: http://en.wikipedia.org/wiki/Nalimo... has a tablebase puzzle with a Dual found from a composed Pogosiants study. Another, from Pal Benko , 1981:
click for larger view
& add a white Knight at c3 or g3 (Problemists call these Twins), white plays, checkmating in two moves, nine men vs Lonely King. No need to go on about how often the theme of castling for attack has been featured in puzzles... |
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| Apr-01-09 |
| Smothered Mate: <hedgeh0g>
Have you found a way to reach the position at move 11 with black to move without black being able to castle queenside?I have tried to but could not.
Gilmoy posted a proof that black must be able to castle queenside, but missed that the c4 pawn could have gone there directly from c2 (as actually happened). I believe this is still open:
Prove that black must be able to castle queenside in the puzzle position, or give a game to show that it is possible that black can not castle queenside. |
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Apr-01-09
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| DCLawyer: <KingG <Yes, this was the game in question: Korchnoi vs Karpov, 1974.>> (1) How did you know that? Impressive. (2) I had heard this story, but had no idea that it had occurred in a Candidates final. What a great story to encourage beginners who are still learning the rules! |
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Apr-02-09
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| KingG: <DCLawyer> It's a fairly well known game. In his book On My Great Predecessors 5, Kasparov says he attended the game as a child. I don't remember if he remarks on Korchnoi having to call over the arbiter(he probably does), but he does say that he immediately saw the 13.Nxh7 shot, as did several members of the audience. |
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Jun-29-09
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| Sem: Castling is allowed since the white rook does not control a square over which the black king moves while castling. |
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