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| Jun-02-09 | | johnlspouge: Tuesday (Easy):
V Tukmakov vs Speelman, 1994 (23.?) White to play and win.
Material: B for N. The Black Kg8 has 2 legal moves, both on the back rank. The White Bd3 and Bf4 attack the K-position along adjacent diagonals. The White Rc1 and Rd1 have adjacent open files, with Bd3 able to discover an attack on Bd5. The White Qg4 attacks Pg7 and eyes Rc8 through Pe6. The White Pe6 cramps the Black position, controlling e7 and being able to advance to d7 to attack Rc8. The Black Rc8 is burdened with protecting Nc5. The White Kg1 is vulnerable to back-rank mates, but is secured from checks. Candidates (23.): Rxc5
23.Rxc5 Rxc5 [else, drop a N]
The Black Rd8 is now loose.
24.Qh4
(forking with the threats 25.Qxd8+ and 25.Qxh7+ Kf8 26.Qh8#) The threats leave Black down at least a N (and probably worse), but the alternatives are no better. (1) 24…f6 25.Qxh7+ Kf8 [Kf7 26.Bg6+ Kf8 27.Qh8#]
26.Bg6 (threatening 27.Qh8#)
Black avoid immediate mate only by sacrificing excesses of material after 26…Rxd6 27.Bxd6. (2) 24…Rxd6 25.Bxd6
(forking again with 26.Bxc5 and 26.Qxh7+ Kf8 27.Qh8#) Black has no time to save Rc5 and will be down at least R+N to P. |
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| Jun-02-09 | | johnlspouge: Hi, <MaxxLange>. Thanks for your post yesterday on V Gashimov vs Kramnik, 2009 explicitly pointing out the common conundrum (1) "take and then fork" or (2) "fork with a threat against the K". Yesterday, I instinctively did not bother to look at the "take and then fork" possibility in the puzzle. Your post made me aware of the need to be conscious of my choice. Today, it was not immediately clear that the "fork with a threat against the K" option included a deadly threat (although it does). As <CHESSTTCAMPS> points out, the position requires some calculation. And as <MostlyAverageJoe> points out, the puzzle is good Wednesday material. Let me join the "welcome back" chorus, <MAJ>. |
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| Jun-02-09 | | Patriot: An "easy" puzzle--right folks? LOL. This wasn't easy at all in my book because there were a number of forcing lines to consider. 23.Bh6 went to the top of my list of candidates. For example, 23...g6 24.Rxc5 Rxc5 25.Qd4 wins a piece (not 23...g6 24.Qd4 e5!). I finally realized 23...g6 is a mistake anyway (23...f6 is the move). I eventually ruled out other forcing lines before considering 23.Rxc5 Rxc5 24.Qh4. This threatens to mate several ways or win a piece. |
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| Jun-02-09 | | Marmot PFL: Lots of candidate moves here. Took several miuntes to find the right sequence, even with yesterday's solution as a clue. I lookes at several slower lines, but 25...f5 refutes most of them, hitting the WQ and defending g7. |
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| Jun-02-09 | | JG27Pyth: I had Qh4 first (wished I'd read the take and fork, v fork threat n take post Johnlspouge mentions) ... what is Black's best defense after Qh4? |
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| Jun-02-09 | | JG27Pyth: Is it just f6, and I get the h pawn consolation prize -- hey, thanks for playing here's a pawn... |
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| Jun-02-09 | | Patriot: <JG27Pyth: I had Qh4 first (wished I'd read the take and fork, v fork threat n take post Johnlspouge mentions) ... what is Black's best defense after Qh4?> 23...Nxd3 looks like a good start. No mate threat and the knight isn't hanging anymore. |
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Jun-02-09
 | | beenthere240: Two puzzles in a row with quiet or at least semi-quiet key moves -- ie non-capture, non-check moves. |
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| Jun-02-09 | | WhiteRook48: what the...? |
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| Jun-02-09 | | CHESSTTCAMPS: <Patriot> regarding the candidate 23.Bh6 <..I finally realized 23...g6 is a mistake anyway (23...f6 is the move).> 23...f5 may be stronger, but there is no definitive refutation as I claimed in my first post. |
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Jun-02-09
| | doubledrooks: While various threats or attacks upon the black king look promising, the winning shot is 23. Rxc5. Now if 23...Rxc5, white launches a double attack with 24. Qh4, threatening the black Rd8 and mate after 25. Qxh7+ Kf8 26. Qh8#. And after 23. Rxc5 f5, both 24. Qh4 and 24. Rxc8 look good to me. I went with 24. Qh4 as it seems simplest. |
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| Jun-02-09 | | Patriot: <CHESSTTCAMPS> I realized after my post that 23...f5 is also possible. But either way it was enough to convince me to look for something else since both moves allow g7 to be guarded by the queen. f6 and f5 may not be a refutation but it shows that Bh6 doesn't look so strong afterward. That's when it's time to start looking for something else before getting too involved in one particular line (going with my teacher's advice "look wide before you look deep"). I should've considered f6 or f5 sooner rather than looking at g6 further, so I sort of came full circle and then discovered f6. |
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| Jun-02-09 | | lzromeu: The most simple and traditional Bh6 don´t works.
This fork (forkmate if this word exist)is great: the Queen mate in Qxh7+ or Qxd8#. Avoid this only with sacrifices I blind this, my mind is very disciplinated to traditional moves.
Neither, this is game is about winning moves with material and positional advantage. |
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| Jun-02-09 | | jheiner: <Patriot> I was looking at Bh6 lines also. I went through a number of calculations, but knew I was missing something. I never got to the R sac because I felt I would "be out of time OTB" so went and checked. Thank you for pointing out f6 as the correct response. I think the attack against the K on the dark squares is more common, so seeing the defense patterns is very important [to me]. I looked at a lot of responses to g6 and subsequent sac attempts with the white B etc. Just wasn't enough there. |
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Jun-02-09
 | | Jimfromprovidence: Here's an intersting continuation.
23 Rxc5 f5 24 Qh4.
click for larger view Now, if 24...Re8 25 Bxa6! Qxa6 26 d7!
click for larger view |
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Jun-02-09
 | | kevin86: I missed this one-oops... |
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| Jun-02-09 | | Udit Narayan: Very similar to yesterday's puzzle...queen threatens the capture or mate! |
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| Jun-02-09 | | YouRang: I went with the not-as-good 23.Bxh7+ Kxh7 24.Qh4+ Kg8 25.Rxc5, winning a pawn. I figured that there was probably something better, but then laziness struck and I was unable to go any further. |
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| Jun-02-09 | | njchess: RxN keeps the attack going, followed by Qh4 forcing Black to defend against mate and losing a rook in the process. Black probably resigns rather than play g6. Time to check. As for the game, 17. ... Nxe5?? was a mistake. It allowed White to displace Black's kingside knight, a key defender, which was sorely needed given White's centrally placed bishops. Clever finish. |
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| Jun-02-09 | | johnlspouge: < <lzromeu> wrote: [snip] This fork (forkmate if this word exist) is great > Hi, <Izromeu>. "Forkmate" is fine by me :) The important point is that if you fork <squares> (here, d8 and h7), as a generalization of the concept of forking pieces, it will open new possibilities for combinations. (Often, pieces can be also be pinned to mate threats, a similar generalization.) |
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| Jun-02-09 | | TheaN: 2/2
Tuesday 2 June 2009
<23.?>
Target: 1:25;000
Taken: >2:00;000
Par: no. For some reason this Tuesday was pretty hard compared to others. -ML-
Meh. I somewhat gave up on this one as I missed the simple 23.Rxc5 Rxc5 24.Qh4 Rxd6 25.Bxd6  and had no true answer on Rxd6 although it was simply defended :). After I saw the game moves, which end after Qh4, I saw it. Well, as said: <23.Rxc5 Rxc5> anything else and Black is a Knight down. <24.Qh4!> and Black cannot defend both 25.Qxh7† Kf8 26.Qh8‡ 1-0 and 25.Qxc8 . This is where Black resigned. Ironically, the proposed Rxd6 might be best: <24....Rxd6 25.Bxd6 > but now f8 is covered by the Bishop so Qxh7 is mate, and he's also attacking Rc5. KO. |
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| Jun-02-09 | | damiano80: <johnlspouge> said:
(1) 24...f6 25.Qxh7+ Kf8 26.Bg6 (threatening 27.Qh8#) I think that Bg6 lose to 26...e5; the simple 26.Qh8+ wins a rook and the game. |
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| Jun-02-09 | | johnlspouge: < <damiano80> wrote: <johnlspouge> said: (1) 24...f6 25.Qxh7+ Kf8 26.Bg6 (threatening 27.Qh8#) I think that Bg6 lose to 26...e5 the simple 26.Qh8+ wins a rook and the game.> The move 26.Bg6 doesn't lose, but it doesn't win either. You are correct that 26.Qh8+ wins easily. I debated this variation longest, but my patience was thin. My week has its rhythm, so when I get a Wednesday problem on a Tuesday, it gets Tuesday's attention span. Thanks for picking up my error. |
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Jun-02-09
 | | gawain: I completely missed it. Very simple, in retrospect. But I was obsessed with forcing the issue with Bh6 or Bxh7+. |
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| Jun-04-09 | | MostlyAverageJoe: <The Rocket: average joe how can a chess engine tell you that its medium level difficulty?> Look in my profile for a link to an explanation. |
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Kibitzing
sac: 23.Rxc5