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|May-30-06|| ||EmperorAtahualpa: Yep, solved today's puzzle too. So far so good this week!|
|May-30-06|| ||dzechiel: <Manic> Very pretty! A picturesque checkmate by the bishop! Wish I'd seen it. :)|
|May-30-06|| ||al wazir: I had the game variation, except for 29. Qh5 instead of Qh4.|
In fact, 27. Qh5 (or Qh4) wins too: 27...Nf8 28. f5 Rg8 (what else is there?) 29. Qxh7+ Nxh7 30. Rxh7+ Kxh7 31. Rh1#.
|May-30-06|| ||al wazir: Or 27. Qh5 Qg8 28. Be4 Nf8 (28...Rg4 29. Bxh7 wins) 29. Bxg6 fxg6 30. Qf3. White is an exchange up and a good bet to win a ♙.|
|May-30-06|| ||prinsallan: Saw it all the way.|
|May-30-06|| ||jahhaj: Easy enough, it had to be something down the h file as White's pieces weren't well placed to attack anywhere else.|
I guess the theme of the week is unavoidable mate. After White's 29th Black is not in check, he has no pieces threatened, he's even a rook up, but he can't get his king out of the mating net.
|May-30-06|| ||patzer2: Note that today's Tuesday puzzle solution 27. Rxh7+! continues the Monday theme from M Turov vs V Karagodin, 1997 of mate with a "waiting move" (29. Qh4 or 29. Qh5 both work for this purpose), or "unavoidable mate" as <jahhaj> noted.|
See http://www.angelfire.com/games5/che... for the definition <Waiting move: A move purposely designed to put the opponent on move without changing the basic structure of the position.>
|May-30-06|| ||jahhaj: <patzer2> Is 29.Qh4 really a waiting move? In my mind a waiting move is one designed to force the opponent to commit himself while keeping your own plans hidden. 'Quiet move' is a better description of 29.Qh4 I think.|
|May-30-06|| ||dakgootje: Yes, i though waiting moves were more like an other way to force your opponent to do something. Or maybe used for zugzwang-like positions. So indeed as the given link says.|
Probably quiet move is indeed better. Always hate when i calculate and i see i cant attack forced, but have to use a quiet move, as your opponent can then tihnk for unexpected things, which makes it harder to be certain of your calculation
|May-30-06|| ||zb2cr: Got it. I'm not sure the term "quiet move" applies to a move with an immediate mate threat, though.|
|May-30-06|| ||jahhaj: <zb2cr> You're right of course, but I suspect that the 'quiet moves' will get quieter as the week progresses.|
|May-30-06|| ||patzer2: Black appears to lose this in the opening. The rare try 4...Bg4 IMO practically forces the Bishop for Knight exchange with extra tempo and a strong and clear advantage for White. Better is 4...Nf6 as in A Bezgodov vs Khalifman, 2005, 4...c6 as in P Negi vs D Marat, 2006 or 4...a6 as in J Shahade vs M Ginsburg, 2003.|
I realize the subtle maneuvering of the modern defense is often intended to tease White into an over extended pawn center, in order to counter attack it with advantage. However, I fail to see how the strange 8...Qc8?! does anything towards achieving that objective. Better here seems to be 8...e5 9. Bc4 Qf6 10. Qxf6 Nxf6 with some hope of salvaging a draw.
Black appears to be clearly lost after castling into White's attack with 13...0-0 14. g5! (+2.34 @ 15 depth, Fritz 8) . Perhaps 13...Nc6 or 13...h6 would have given Black some chance for organizing a credible defense, but the position still appears desperate and on the verge of losing in those lines also.
The pawn advance 18. e5! is instructive. If 18...dxe5? (diagram below),
click for larger view
then 19. Bxd7! Qxd7 20. Nf6+ wins the White Queen via a discovered attack with check.
|May-30-06|| ||patzer2: <jahhaj> <dakgootje> I looked up the http://www.angelfire.com/games5/che... definition <Quiet move: An unassuming move that is not a capture, check, or direct threat.> |
Based on both definitions the term "waiting move" seems appropriate, since 29. Qh4 does make a direct threat (i.e. mate) and is intended to give Black a meaningless move, which does not change the basic structure of the position (i.e. Black still faces a quick forced mate).
Perhaps there is another term for meaningless waiting moves just prior to mate, but I don't know of any. In any event, 29. Qh4 is anything but "unasuming" and definitely does make a "direct threat." So it is not a "quiet move."
|May-30-06|| ||Halldor: Nice traditional clearance of the h-file by a rook sac, and here it leads to a forced mate.|
|May-30-06|| ||Halldor: I would say that a 'quiet move' is usually a positional move that turns out to be very strong although often it is not obvious when the move is played. <patzer2> found a good description for it.|
But 29.Qh4/h5 is a move in a forced mate combination (if Black hadn't seen it already it must have been a blow for him). This is not a 'waiting move' either, the queen simply has to go to the h-file, if it were there already White could mate in one.
|May-30-06|| ||patzer2: <Halldor> <This is not a 'waiting move' either> Why not? |
If a waiting move is one which (1) "purposely puts the opponent on the move" and (2) "does not change the basic structure of the position," then 29. Qh4 meets these two criteria for a "waiting move."
After 29. Qh4, Black is (1) purposely put "on the move," and (2) the "basic structure of the position is not changed" (black gets mated).
|May-30-06|| ||YouRang: Got it pretty fast - I've become familiar with this very common theme: |
One side has connected rooks on the back rank, and an open file directed at the opposing king's position.
Use one rook to blast open the defense, and after the king captures that rook, slide the other rook to the square vacated by the first rook to continue the attack with check.
Then, it's just a matter of seeing the follow-up moves. :-)
|May-30-06|| ||alphee: Reminds me of the chapter "attack on the casteled king" (or something close to it) in Vukovik's Art of Attack in Chess. Or may be it is just because it is tuesday.|
|May-30-06|| ||Halldor: <patzer2> I'm not convinced if this fits to no. 1, "purposely puts the opponent on the move" - at least there is no zugzwang here, and White doesn't have to wait for any decision by Black, it doesn't matter what Black does, he can't prevent the mate. - I always thought a waiting move was about waiting for some decision by the opponent before deciding what to do (if he would castle long or short etc.), or putting him in zugzwang. Am I wrong?|
|May-30-06|| ||Fezzik: Well, at least I made up for missing my first Monday puzzle ever by finding this one relatively easily. |
Yes, it's the same theme as yesterday's, but finding both ...Qe1 *and* ...Ka8 was too much for me. Today, the forcing moves first rule worked beautifully. Maybe I can play chess after all. (Maybe)
|May-30-06|| ||Fezzik: BTW,
29.Qh4 doesn't wait for anything. It threatens mate and protects the queen. It aint no waiting move. It's a direct attacking move that doesn't have a defense, and it's the logical follow-up to the Rook sac.
|May-30-06|| ||kevin86: I,too,answered this one right. The rooked is sacrificed to gain a tempo for its brother to initiate the mating combo.|
|May-30-06|| ||patzer2: <Fezzik> <It threatens mate...It aint no (i.e. it isn't a) waiting move.> Appreciate your comment, and see your point. I suppose 29. Qh4, even though it is a followup to a forced mating combination begun at least two moves previously, could in it's own right be considered an "unstoppable mate threat not involving a check or capture." If one takes this poisition, then 29. Qh4 by creating a separate mate threat, does not meet the second criteria in the definition, and therefore is not a waiting move.|
However, to me the move that threatened mate was the first move in the combination (27. Rxh7+!), while 29. Qh4 was simply a followup not involving a check or capture, which waits for Black to make a move before continuing on with the forcing check, capture and mate sequence. Perhaps "waiting move" is an unconventional way to refer to such a move, but I find it does help me to remember to be aware of such possibilities in forced mate combinations.
|May-30-06|| ||patzer2: If one uses IBM's definition from their Deep Blue site's Chess Glossary, which I assume was reviewed and approved by GM Joel Benjamin, at http://www.research.ibm.com/deepblu..., I guess 29. Qh4 (decisively threatening mate) is not a waiting move:|
A move that, while not achieving anything positive, does not weaken the position.>
|May-30-06|| ||LIFE Master AJ: I got this one fairly easily, but I thought it a tad tough for a Tuesday.|
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