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David Navara vs Jan Timman
Czech Coal Carlsbad Tournament (2007), Carlsbad CZE, rd 5, Sep-13
Russian Game: Classical Attack. Staunton Variation (C42)  ·  1-0



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sac: 16.Qxg4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Oct-26-10  kellmano: Further, the king going to d7 after Qb7+ puts up more resistance but white is still winning.

I guess it is reasonable for a puzzle to ask you to find the cleanest win though

Oct-26-10  BOSTER: Yesterday <scormus> wrote <After an embarrassing amount of time I stopped looking for combo involving 18.Nb5>. <Patriot> <what is really interesting is how many people had a blind spot in this position. I had the same blind spot! Very strange>. The "<Blind spot>" is the concept which is very difficult to understand and not easy to explain. The problem is that on the board we can see only the placing of the pieces , their colour and squares,but we can not see the interconnection between pieces. Such interconnection on the board does not exist, we have it only in our brain. The information,that when black queen on c7 and bishop on d6 protect each other only in our brain , because of Rules,Knowledge and experience, I'd say they in our memory cell. When we see white queen on c2 and black queen on c7,separeted by white Knight c3 and black pawn c6 we immediatly send the signal in our "computer" about possibility using the pin from our memory. And because this signal is more steady (you meet this pattern very often) then the signal about queen-bishop protection,which can be delay becase of some obstacles lure his attention (for ex. <Laydeez> for <Once>) ,that means we have time " to play" Nb5 before we understand that Queen c7 is ,protected.
Oct-26-10  LIFE Master AJ: <Oct-26-10 gmalino: <LIFE Master AJ> I would love to see your checklist! Obviously it's a very strong tool.>

On three pages of my website, please read all of them carefully. (To get the reasons WHY and ideas BEHIND my checklist.)


# 2.)

# 3.)

Oct-26-10  David2009: Navara vs Timman, 2007 White 87?

Took me longer than it should - I was fixated on making Qh3+ happen.

In the game, if Black had played 83...Kd5 then 84 Qd3+! is nice. If K to c file, then Qc2+ as in the game. If Ke5 then c8=Q. This leaves only Ke6 when Qh3+! skewers the Queen the other way round.

<lo2: Can one not play 87. Qb7+ Kc5 88. Ka8 And then I do not see anything that can stop white from winning.> You are absolutely right IF Black plays Kc5. However Black can try 87...Kd7 88 Qd5+ Ke7 and White still has work to do (<kellmano>). It is still a table base win but is not easy. Try your luck with this Crafty End Game Trainer link to the puzzle position: You are white, drag and drop the move you want to make. Good luck!

However your method is spot on if at move 83-5 Black had decided to retreet to the a file. Let's rewind to move 83 with White to play:

click for larger view

Navara vs Timman 2007, 83? White starts Qc3+ (as in the game) and Black has problems. If Kd5 White has Qd3+ etc as analysed earlier. This leaves only Kb6 (or b5) when Qb3+ forces the K to the a file (to avoid the Queen skewer). Now the <lo2> recipe Qb7! followed by Ka8 wins since Black can't check on the a file without having his Queen pinned.

Crafty EGT check of this position:

Oct-26-10  lost in space: 87. Qc2+ Qxc2 88. c8=Q+ Kd6 89. Qxc2 1:0

Sometime Tuesdays are easier than Mondays

Oct-26-10  lo2: Yeah did not see 88. ... Kd7

Why do I see something that obvious, must say I really hate missing things like that, and it seriously makes me feel like a complete jacksass. Know it might sound a bit whiny, but it irritates me like hell.

And just tried against crafty, which I cannot conquer at all. And it just makes me even more irritated, that crafty always just got the perfect answer for each move. So I am not getting anywhere.

Oct-26-10  LIFE Master AJ: <David2009>

First link, mated in around 12 moves. No surprise there, it was an easy win.

Second link,; promoted the Pawn, (with a won position); after less than 15 moves. I repeated this result several times.

You sure that this version of Crafty uses a table-base?

Oct-26-10  LIFE Master AJ: These are the moves I chose the first time around:

click for larger view


83.Qc3+ Kb5; 84.Qb3+ Ka5; 85.Qb7 Ka4; 86.Ka8 Qe5; 87.Qa6+ Kb4; 88.c8Q Qe4+; 89.Qcb7+ Qxb7+; 90.Qxb7+, ( ) Line

Oct-26-10  LIFE Master AJ: Of course, I have studied just about every ending under the sun.

If I got it right, it may only be because I remember the correct technique.

Its also pretty obvious that the White Q+P+K all have to work together ...

Oct-26-10  LIFE Master AJ: <Monday's puzzle> Sultan Khan vs G A Thomas, 1932

<<Oct-26-10 gars: This I solved easily. Yesterday I went wrong. Can anybody explain that?>>

Yes! The position for yesterday's puzzle, (18. '?') was MUCH more difficult, in my opinion.

If - for no other reason - there was so much stuff on the board. (Seeing that the WN was trapped - was tough to do.)

BTW, I annotated the game that you asked "us" to look at ...

Portisch vs E Torre, 1979.

Oct-26-10  LIFE Master AJ: (BN was trapped.)


Oct-26-10  wals: Nalimov endgame tablebases

Qc2 win in 11
Qc3 win in 14
Qf3 win in 15
Qa4, Qe6, win in 16
Qc4 win in 17
Qb7 win in 19
Qb1,Qb4,Qd5,Ka8,Ka7, draw
Qb5 lose in 7
Qg3,Qb6,Qf7, lose in 3
Qa3,Qd3,Qe3,Qh3,Qb2,Qa2,Qd1,Qg8,lose in 2
Kc8, lose in 1

A few there to test your skills.

Oct-26-10  LIFE Master AJ: Earlier post >> 83.Qc3+ Kb5; 84.Qb3+ Ka5; 85.Qb7 Ka4; 86.Ka8 Qe5; 87.Qa6+ Kb4; 88.c8Q Qe4+; 89.Qcb7+ Qxb7+; 90.Qxb7+, ( ) Line

IF anyone desires it, I can explain each one of my moves. (Sometimes, this helps the lower-rated players a lot.)

Oct-26-10  LIFE Master AJ: Like 86.Ka8 was to break the pin on the c-pawn.
Oct-26-10 Sorry to be a nudge, but under-promotion to a rook also works.
Oct-26-10  LIFE Master AJ: If you want, here a Queen is prolly best.
Oct-26-10  David2009: Following my first post Navara vs Timman, 2007

<LIFE Master AJ: [snip] You sure that this version of Crafty uses a table-base?> I am reasonably sure it DOES NOT link to a 5-man tablebase, but that it DOES to a 4-man tablebase (it plays a lethal Q vs R or R v N game). Try the following link

click for larger view

(which is the final position in Jaenisch vs Shumov, 1854). The position is a dead draw - all Black need do is march his K towards h8. No need for a table-base, then. But you can swindle Crafty and win as White!

You can also sometimes swindle Crafty in drawn endings with R+P vs R. Now this really does surprise me.

Crafty EGT can look sixteen moves ahead in some positions (crafty chessforum discussed in CHESSTTCAMPS chessforum).

<lo2: Yeah did not see 88. ... Kd7 [snip] And just tried against crafty, which I cannot conquer at all. And it just makes me even more irritated, that crafty always just got the perfect answer for each move. So I am not getting anywhere.> My sympathy:

(A) Have you had the pleasure of beating Crafty using the link to the position at move 83 given in my post Navara vs Timman, 2007 In the main line Crafty retreats to the a file after which your plan of Qb7 and the Ka8 works just fine;

(B) In the Crafty EGT link to the puzzle position, after 87 Qb7+ Kd7! 88 Qd5+ Kc7 try the quiet move 89 Qd4! The point of Qd4! is that it controls a1 and h8 so Black can't check from those squares. Crafty finds nothing better than 89 ...Ke6. You are now ready to play 90 Kb7 to leave

click for larger view

(Black to play). Crafty (to move) plays Qh1 met by 91 Ka7! and there is nothing better than Qh7 allowing 92 Qb6+ and Black is loses quickly.

So why doesn't Black play Qg2+ in the last diagram, so as to answer Ka7 with Qa2+ etc? The answer is that White's Q on d4 also controls b2, so White can play Kb6!! This is a very difficult move to see - table bases find it but mere mortals can't (unless they have seen it before).

(C) More generally try which is a very user-friendly 5-man Nalimov table base.

Hope this helps.

Oct-26-10  azax: Better late than never.

Tuesday puzzle, White to move.

Material: White is up a pawn in a queen ending.

White's pawn looks close to promotion, but since the pin will take a while to undo, he must look for a tactic. The queen fork 87. Qc2+ immediately jumps out (always look for checks!).

87. Qc2+ Qxc2 88. c8=R+

"Hey there, I dunno about you, but I think it's time to resign."

Oct-26-10  morphy2010: Can one not play?

87. Qb7+ Kc5 88. Ka8

And then I do not see anything that can stop white from winning.

Oct-26-10  wals: Analysis Rybka 4 x 64

depth 21 : 4 min :
Black blunder
(+1.37):39...Nb3. Best, Rc7, 0.57.

depth 30 : 56 min :
Black blunder
(+5.24):56...Rf1. Best, Rd1+, +1.12.

depth 25 : 4 min :
White blunder
(+0.29):60.b6. Best, Rf6+, +5.41.

depth 26 : 4 min :
Black blunder
(+1.98):60...Rb1. Best, Rc1+, 0.29.

depth 23 : 3 min :
Black blunder
(+5.17):62...Rc1+. Best, Kd7, +1.98.

depth 21 : 3 min :
Black blunder
(+7.68):65...Ke5. Best,Rg1, Rh1, +6.09.

depth 21 : 3 min :
Black blunder
(+8.14):67...Rc1+. Best, Rc1+ is the best.

depth 24 : 3 min :
White blunder
(=0.00)69.Rxg6. Best, b7, +8.14.

depth 22 : 4 min :
Black blunder
(+7.58):72...h2. Best, Rb1,Rc6, =0.00.

depth 15 : 2 min :
White blunder
(+3.34):76.Rf7. Best, Qh8+.

depth 16 : 3 min :
Black blunder
(+7.27):76...Kd4+. Best,Kd6, Ke4, +6.05.

depth 23 :
Black blunder
(+11.47):77...Rxc7. Best, Qe5, +6.06.

Nalimov endgame tablebases shows
78.bxc7 wins in 25.

Oct-26-10  redorc19: Easy... i guess. i was recently, however reviewing some tactics so i'm kind of cheating... I remember something like this in another game does anyone know what this tactic is called???
Oct-26-10  LIFE Master AJ: <Oct-26-10 redorc19: Easy... i guess. i was recently, however reviewing some tactics so i'm kind of cheating... I remember something like this in another game does anyone know what this tactic is called???>

Lure, decoy, false sack.

X-Ray, skewer, reverse pin ... (and win) said Reinfeld.

Gee! I must be tired. I think I am starting to sound like CO.

Oct-26-10  Patriot: <BOSTER> You gave a very interesting explanation.
Oct-26-10  jst102: Brilliant!
Feb-11-11  redorc19: oh yeah, <LIFE Master AJ> thx for the multiple tactics
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