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Jul-29-11
 | | M.Hassan: "Difficult" White to play 18.?
White is a pawn down
Knight move can threat a checkmate:
18.Nb5 <if....Qxc4 19.Nxa7#> 18.........Bxb5
19.Bxb7+ Kxb7 forced
20.Qxb5+ Ka8 or c8
21.Qc6#
Time to check
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Hurray!!! another difficult survivor |
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Jul-29-11
 | | rhickma4: If 18...Qxf4 then White can interpose 19.Nxa7+ Kb8 20.Qxf4+ Kxa7 21.Qc7 and wins the B on e7. |
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| Jul-29-11 | | tacticalmonster: 18 Nb5 Bxb5 19 Bxb7+ Kxb7 (19...Kd7 Qxb5#) 20 Qxb5+ Kc8 or Ka8 21 Qc6# |
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| Jul-29-11 | | tacticalmonster: This week is extremely easy as I can solve the puzzle more quickly than usual and I see most regulars are getting them so far |
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Jul-29-11
 | | sevenseaman: Posters terming today's puzzle 'easy' confound me. May be my powers of analytical concentration are waning. I took a good 5 minutes in deciding on 18. Nb5 and that a later Nxa7+ was implacable for Black. Most of my time went into eliminating 18. Bxb7+ Anyone who leaves his Q en pris has to be careful. |
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| Jul-29-11 | | IRONCASTLEVINAY: its easy not difficult |
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Jul-29-11
 | | lost in space: Haven't seen the threat Nxa7#. Sigh |
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| Jul-29-11 | | chesskidnate: Notably, you also get to annhilate black after 18...Qxf4 19.Nxa7+ Kg8 20.Qxf4+ Kxa7 21.Qc7. |
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| Jul-29-11 | | anandrulez: drunkennight: aren't todays computer more than 4-5 move deep ? it I think today its more sensible to go through the comp moves just know what the heck it has planned |
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| Jul-29-11 | | anandrulez: lostinspace : there many games with the black bishop covering the king's squqares and a check and can mate the king . hence check if the king is under ny problem from opp pieces and work from that . |
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Jul-29-11
 | | David2009: Romanishin vs Ivanchuk, 1986 White 18? Try 18.Qxd4 cxd4 19.Rc1 dxc3 20.Rxc3+ Bc6 21.Rxe6 with compelling threats - GOOT!. But NOT 21.Bxc6 bxc6 22.Rxc6+ Kd7! 23.Rc7+ Ke8 24.Rexe6?? Rd1+ and
Black delivers back rank mate.
Check:
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click for larger view
Missed it by a mile. My line loses a piece without compensation after 21...Kd7!. Crafty End Game Trainer link: http://www.chessvideos.tv/endgame-t.... And yet the combination was not difficult to see: 18.Nb5! threatens mate on a7. The EGT defends with 18...Qxc4 but 19.Nxa7+ etc. wins quickly. |
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| Jul-29-11 | | jheiner: 18.White to play (Difficulty: Difficult) Romanishin vs Ivanchuk, 1986 Material: Down a P.
Position: White's Qc4 is hanging. Black's K has no safe squares. Candidates: Qb5, Bxb7+, Nb5+
The first two candidates don't work:
18.Qb5 (threatening Qxb7#.) 18...Bxb5 19.Nxb5 (threatening Nxa7# and attacks the Q, but Qxf4 removes all threats.) 18.Bxb7+ Kxb7 (forced) but how to continue the attack. But the third looks promising:
18.Nb5+ (threatening Nxa7# mate and Nxc4 winning the Q) Bxb5 The immediate recapture fails:
19.Qxb5 (threatening Qxb7#.)
If 19...b6? 20.Qa6#
If 19...Rf8 20.Qxb7+ Kd8 21.Qb8+ Bc8 (blunting the mating attack) So the continuation must be more forcing. Change the move order: 19.Bxb7+ Kxb7 (forced) 20.Qxb5+ Ka8 (or Kc8) 21.Qb8#
Time to check. |
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| Jul-29-11 | | jheiner: My powers of visualization failed to see that the Bd7 cleared a space both for Rd7 to protect in the case of Qxb5 and also as an escape square after Bxb7+. My lines and analysis were otherwise correct, but missing that square is almost enough for me to not take credit on today's puzzle. Almost... |
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| Jul-29-11 | | solskytz: Found it nice and easy...
first I noticed the unprotected Q on c4, uh oh...
then the a7 mating square came to mind...
then I saw the oblig capture on b5 with the black B... then the blow Bxb7 check, king takes, Q to b5 check
took a little more time to see that Qb8 isn't the way to check, and that an immediate 1. Nb5 Bxb5 2. Bxb7+ Kxb7 3. Qb5+ Kc8 4. R(whichever) to d1, in order to block the black K's escape, prepare checkmate on b8 and gain an important tempo, ostensibly winning the black Q and emerging up material with a continuing and strong attack, isn't going to work because of ...Qb4 which covers everything - saves the Q, and eyes b8 (x-ray defense, same as yesterday) Then I saw 4. Qa6+ which pushes the K to the d-file where I'll 'geometrize' him with the Q, not fearing a rook's attack on my Queen as when she stood on b8 on the previous variation. All together - something between half a minute and a minute. Good for 5 minute blitz - not so for 3 minute blitz... OTB I play 5 minutes and would score a brilliancy (these kind of attacks come from my favorite anti-Sicilian 1. e4 c5 2. c3 when black castles long). online I play 3 minutes and would either lose on time calculating the complications, or exchange Queens and hope to outsmart and/or 'outclock' my opponent in the subsequent play. |
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Jul-29-11
| | sevenseaman: <jheiner> Credit or no credit, you are fine in your analysis. I can see that only your last move, 21. Qb8# went awry. It needed to be 21. Qc6#.
To me it looked a typo. |
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Jul-29-11
 | | Once: The old adage is "give a check - it might be mate". I think this is meant to be ironic. We really ought to be able to work out whether a check is mate or not. But we can adapt that saying and possibly make it a little more useful - "threaten a mate - it might be inescapable". It seems to be a constant theme in many of our puzzles that the winning side prevails by ignoring a threat and making a mate threat in return. The mate threat doesn't always work, but it can force the opponent to compromise his position or give away material. In today's POTD, Nb5-Na7# just screams out to be played. It's like a class full of kids and there is one with his hand held up as high as it will go "Me, sir! Me, sir! Ask me, sir!" Then it's not hard to see that 18...Bxb5 is the only way to save the black queen and defuse the Nxa7# mate threat. Then we start the POTD afresh, but this time with 18. Nb5 Bxb5 on the board. And again we are into pattern recognition time. 19. Bxb7+ gives the queen an entry square with check and however black runs it's mate in short order. Fun puzzle. Maybe not your usual Friday difficulty, but an enjoyable little mouthful all the same, washed down with a cheeky little chablis. |
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| Jul-29-11 | | gofer: <18 Nb5 ...>
Black must avoid Nxd4 and Nxa7#. There is only two options and both are
horrid.
Option 1 (Suicide)
<18 ... Bxb5>
White now has a number of choices; Bxb7+, Qxb5 and Qxd3+ but only one
means that the attack gains momentum and infact kills black dead dead
dead...
<19 Bxb7+ ...>
White has ripped black apart and so black probably resigns... 19 ... Kd7 20 Qxb5#
19 ... Kxb7 20 Qxb5+ Ka8/Kc8 21 Qc6#
Option 2 (Jetison Material)
<18 ... Qxf4?>
<19 Nxa7+ Kb8>
<20 Nc6+ Bxc6>
<21 Qxf4+ ...>
White is winning easily black cannot play Bd6 as it immediately loses
Nf6.
Time to check... |
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Jul-29-11
| | cocker: Surprisingly clearcut. Black has several pieces in play but cannot block the mate with any of them. Perhaps easier than usual for a Friday but I enjoyed 'getting one right' for a change. |
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Jul-29-11
 | | morfishine: I only got this far: 18.Nb5 Bxb5 19.Qxe6+ Bd7 20.Be5:
click for larger view
I'll check to see if its at least close...
Wrong check! Very enjoyable puzzle |
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Jul-29-11
| | sevenseaman: Once we have made 18. Nb5 notice how Black is unable to take the white Q. His imperative is Bxb5 as he sees 19 Nxa7#. Move order becomes tricky for White here. The White Q too cannot jump the b5 B straight away, for then the Black Q gets the tempo to take your vital B at f4, and all your plans fall apart. The thing to do here is retain tempo by 19. Bxb7+ and force the K to respond. And now 20. Qxb5+ delivers full punch. 20... Ka8 or c8 and 21.Qc6# is routine. the Black Q that had a charmed life, lives on as the spurned spinster. Thus the line is;
<18. Nb5 Bxb5 19.Bxb7+ Kxb7 () 20.Qxb5+ Ka8 (orKc8)
21.Qb8#>
As posters found today's puzzle quite easy, the above is nothing new, mere loud thinking to get some clarity. |
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Jul-29-11
 | | scormus: Surprising to Chuky on the receiving end of this blitzkrieg finish. 18 Nb5! Bxb5 (... Qxb4 19 Nxa7#) 19 Bxb7+ Kxb7 (or ... Kxd7 20 Qxb5#) 20 Qxb5+ Kc8 or ... Ka8 21 Qc6# <cocker> yes, remarkably clear cut. Elegant too. The way I like them |
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Jul-29-11
| | scormus: <Once> again, brilliant commentary. You could be paid a fortune for this sort of thing |
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Jul-29-11
 | | agb2002: White is one pawn down.
Black threats 18... Qxc4.
The black king does not have free squares to move. This suggests 18.Nb5, threatening 19.Nxa7# and 19.Nxd4: A) 18... Bxb5 19.Bxb7+
A.1) 19... Kxb7 20.Qxb5+ Ka(c)8 21.Qc6#.
A.2) 19... Kd7 20.Qxb5+ Kc8 21.Qc6#.
B) 18... Rde(f,g)8 19.Nxd4 + -.
C) 18... Qxf4 19.Nxa7+ Kb8 20.Qxf4+ Kxa7 21.Qc7 Ka6 (21... Bc6 22.Bxc6; 21... Rb8 22.Qa5#) 22.Bxb7+ and mate soon. |
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Jul-29-11
| | sevenseaman: <morf> Good effort! You were on the right road mostly, only your vehicle skidded out of control and mired into the swamp. I can see that from the diagram provided. Its standing at a queer angle. No matter, we will get it back on road tomorrow. |
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Jul-29-11
| | sevenseaman: All specialisations in the long run acquire a jargon of their own and can be indecipherable to a layman (or a laywoman). I am a Bridge aficionado and a friend e-mailed me the following; [A Cleaning woman was applying for a new position.......
When asked why she left her last employment she replied, "Yes, sir, the wages were good, but it was the most ridiculous place I ever worked. They played a game they call BRIDGE and last night, a lot of folks were there.....
As I was about to bring refreshments, I heard a man say ‘Lay down and let’s see what you got.’ Another man said ‘I got strength, but not much length.’ And then another man said to a lady,
‘Take your hand off my trick'......
I pretty near dropped dead just when a lady answered, 'You forced me. You jumped me twice when you didn’t have the strength for one good raise’.....
Another lady was talking about protecting her honour. And two ladies were talking and one said, ‘Now it’s my turn to play with your husband while you play with mine’....
Well, I just got my hat and coat and as I was leaving, I hoped to die if one of them didn’t say, ‘Well, I guess we can go home, this is our last rubber'!"] |
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sac: 18.Nb5