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|Oct-19-10|| ||amaurobius: <Once> If even you find it a challenge thinking of something new to say, then what hope is there for the rest of us?|
Excellent post today, by the way.
|Oct-19-10|| ||zb2cr: I found this one quickly. I can do no better than point to the excellent commentary by <OBIT>, <dzechiel>, <Brandon plays>, <Formula7>, <gofer>, and <agb2002>.|
The "might-have-beens", including <Once>'s were excellent as well.
|Oct-19-10|| ||Patriot: I pretty much thought white was winning on instinct after 44.Qxb7+ Rxb7 45.Rxb7+ Ke8 46.Rxf7 Kxf7 47.a4. However I did look at counterplay with 47...c5 and 47...e5.|
But I forgot to use an old tool, which proves the line works. It's called "square of the pawn". In order for black to catch up with the a-pawn he must first capture the f-pawn and lose a tempo. So after 47.a4 Kxf7 48.a5 it's easy to see that black is "out of the square" and can never catch up to the pawn.
Other attempts at counterplay such as 47...c5 or 47...e5 fail, thanks to the king and the d-pawn. After 47...e5, 48.dxe5 should be convincing enough. 47...c5 48.Kb1 or 48.Kb3 and those pawns are going nowhere.
This is another example of the power of the outside passed pawn.
|Oct-19-10|| ||David2009: N Vlassov vs A Iljushin, 2003 White 44?|
White liquidates into a won ending with 44 Qxb7+ Rxb7 45 Rxb7+ Ke8 46 Rxf7 Kxf7 47 a4 and now (A) 47...Kxf6 48 a5 queens well ahead of Black (B) 47...c5 48 a5 cxd4 49 a6 d3 50 Kb1 snuffs out Black's counter-play.
Time to check:
click for larger view
Black (to play) finds the best human move: (C)...Resigns.
|Oct-19-10|| ||southeuro: whats wrong with 29....Nxd3 ??|
|Oct-19-10|| ||OBIT: I think <Petrie811> has a point about 43...Kd6. Black threatens ...Qxf6 and intends to meet 44. Qb4+ by 44...Kc7. The only plan I see for White is playing 44. Rf3 Rg8 (retreating to move 41) and pushing the queenside pawns, but I don't see that offering much winning chances. It looks to me like 43...Kd7 still deserves two question marks.|
|Oct-19-10|| ||LIFE Master AJ: The following continuation is a little long, but it is very easy to calculate, (no real sidelines): |
44.QxP/b7+!, RxQ/b7; 45.RxR/b7+, Ke8; (any other move drops the BQ for free.) 46.RxQ/f7, KxQ/f7; 47.a4, (This appears to win, as the Black King is "outside the square of th Pawn" on a4.) 47...KxP/f6; 48.a5, Ke7; 49.a6, Kd7; 50.a7, and the pawn promotes.
This has got to be it, although I spent less than two minutes on the whole problem. (I also quickly ran through my steps ... my 7-point checklist. The checklist also serves as a good analysis guide, you won't miss anything essential if you use it.)
|Oct-19-10|| ||LIFE Master AJ: <<<<Oct-19-10> David2009:> (B) 47...c5 48 a5 cxd4 49 a6 d3 50 Kb1 snuffs out Black's counter-play.>|
An important sideline, I did not even seriously consider this. Good catch!
|Oct-19-10|| ||Patriot: <LIFE Master AJ> What is your 7-point checklist, if you don't mind me asking? I went to your websites first, but did not see it there. Thanks!|
|Oct-19-10|| ||kevin86: A Monday type pozzle on Tuesday:at the plus of a pawn,white exchanges rooks and queens off and breakaways with his pawn. The kind of chess I like seeing.|
44 ♕xb7+ ♖xb7 45 ♖xb7+ ♔e8 46 ♖xf7 ♔xf7 47 a4...followed by a5,a6,a7,a8,a9,a10 lol
|Oct-19-10|| ||sleepyirv: Thought process: Well, you can simplify into a winning endgame... but shouldn't a Tuesday be more snazzier?|
Answer: Well, no. Gotta learn to calculate these games out.
|Oct-19-10|| ||Justawoodpusher: Saw the queen sac right away. Interesting question was only if the a-pawn is fast enough. And as already mentioned, because black has to capture the f-pawn he leaves the "square" and cannot enter it again.|
Also without the f-pawn white wins, but this would have been a Wednesday or Thursday puzzle...
|Oct-19-10|| ||twin phoenix: Ok i must be an idiot but i can't understand why black didn't play 29.--,Nxd3? I don't see a mate and it appears white just drops his queen....|
|Oct-19-10|| ||chesskidnate: <petrie911> That probably wouldve been blacks best try now i haven't worked out all the lines but it looks like white has 44.Qa7 Kc7(44...Qc7 45.Qc5 Kd7 46.Qe7 Kc8 47.Qxe6+ Qd7 48.Qg8+ Qd8 49.f7 Kc7 50.Rg1 appears to win) 45. a4 Qxf6(perhaps too greedy, though leaving the pawn there could very easily be much worse) 46.a5 Qf8 47.a6 Qc8 48.Qb6+ Kd7/d6 49.axb6 looks quite scary for black, maybe he can hold on but i would expect that to be a white win(maybe you could even march your king up to a7)|
|Oct-19-10|| ||MaczynskiPratten: <twinphoenix, southeuro>, yes, 29..Nxd3 would be winning. This is further evidence that the game score is wrong, 26 Qd3 should be 26 Qf3 (see earlier posts)|
|Oct-19-10|| ||Naugh: 44. Qxb7 suggests itself almost at once. Two passed passed half a mile apart are enough justification for exchanging material.|
|Oct-19-10|| ||xiko9: yes, there is no problem with Nxd3. According to Rybka 2.2 32 bit
(-7.88) 29...Nxd3 30. Nc5 Nxc5 31.Bxc5.
It must be a mistake from the annotation.
|Oct-19-10|| ||wals: Analysis Rybka 4 x 64
depth 19 : 3 min :
(+3.65):26...Bg5.probably to stop Bh4.Best,Qxd3,-0.44. Rg7,=0.27.
depth 18 : 3 min :
(-0.05):27.Na4.possibly aiming for c5.
Best, Bxe6, +3.65. Qxh7, +3.51.
depth 20 : 4 min :
( 0.82):27...Neg6.protecting the Queen? Best, Qxd3, =-0.05.
depth 20 : 3 min :
(-11.90):29.Bd6.the Queen is up for grabs. Best,Qa3,+0.69.
depth 20 : 2 min :
(=0.00):29...Nxh3.took the Bishop over the Queen.Nxd3, -11.90.
depth 20 : 2 min :
(+0.55):35...Re8.Best, b6 (=0.00),
attacking the knight.
depth 16 : 5 min :
depth 11 : 3 min :
( 0.65):42.Rb3.Offset by Rb8. Best, a4, +3.88.
depth 13 : 3 min :
(+10.14):43...Kd7.Best, Kd6, +1.25,
allowing more protection to b7.
Black resigned move 47.
|Oct-19-10|| ||LivBlockade: <Patriot> This looks like LIFE Master AJ's 7-point checklist:
|Oct-19-10|| ||M.Hassan: "Easy" White to play 44.?
Materials are equal
Queen sacrifice shows me the green light!
In this position, White has two past pawns, Black has none. One will be no doubt promoted.
This could be the correct line. Let's check
|Oct-19-10|| ||EXIDE: Did not see, that the end game was won after RxQ. I thought that white at best could get a draw by perpetual check, by 46.Rb8+:kd7 47 Rb7+:ke8. I usually get Tuesday puzzles right. I am disappointed.|
|Oct-19-10|| ||turbo231: Got it. Black can't take the pawn at f6 plus catch the pawn on the a file.|
|Oct-19-10|| ||Patriot: <<LivBlockade>: <Patriot> This looks like LIFE Master AJ's 7-point checklist: http://www.ajschess.com/lifemastera...;|
|Oct-20-10|| ||TheBish: N Vlassov vs A Iljushin, 2003|
White to play (44.?) "Easy"
Material is even, but White can create an outside passed pawn in the endgame (with a quick conversion from the middlegame) after 44. Qxb7+! Rxb7 45. Rxb7+ Ke8 46. Rxf7 Kxf7 47. a4 Kxf7 48. a5 and the pawn can't be caught.
|Oct-20-10|| ||LIFE Master AJ: <<<<<<<Oct-19-10 > Patriot:> <LIFE Master AJ>> What is your 7-point checklist, if you don't mind me asking?> I went to your websites first, but did not see it there.> |
Sorry I missed your question!
Its an article, in three parts. (Please take the time to read the whole thing, it will give you the reasons that I went to this system.)
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