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| Jun-10-12 | | Tiggler: <sevenseaman> <All I can say I have enjoyed yesterday's and today's puzzle very much. This is the kind of stuff that should be coming along every day.> I'm happy for your enjoyment, and I liked these two also, but let's NOT have the same kind of stuff everyday. I appreciate the variety. |
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| Jun-10-12 | | sevenseaman: After seeing <M.Hassan> line (a good one) I realised the weakness in my line at ii). Instead of 28. Bc2. 28. Ba3 is a better continuation for White. It should be; 28. Ba3 Bf8 29. Qe3 Bxa3 30. Qxb6 Rxb6. And Black should still win but it is not so spectacular as in my line iii). |
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| Jun-10-12 | | evlozare: <mhassan>- black is a pawn up but a piece down. |
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| Jun-10-12 | | Tiggler: 23. Qa3 would have offered more resistance, and possibly left W OK or better. Earlier posters (in 2004) also offered 22. Qe3 as a possibly winning improvement for W. It appears that this game by Petrosian, although much admired, is flawed. The same has been noted about today's GOTD also by Petrosian. No one plays flawless chess, so best not to get carried away with exclamations of awesomeness without analysing the game first. |
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| Jun-10-12 | | LoveThatJoker: This is a tremendous puzzle because it is a WC Petrosian puzzle!! <23...Nd4!!>
a) 24. Na3 Qxa3!! 25. Qxa3/Bxa3 Nxc2#
b) 24. Bb2/Ba3/Qa3/c3?? Nxc2#
c) 24. Rxd4 Rxb1+! 25. Kxb1 Qb4+ and 26...Qxe1 
d) 24. Bd3 Rxb1+! 25. Kxb1 Qb4+! 26. Bb2 (26. Ka1 Rb8 27. Ba3/c3 Qc3+ Mating) 26...c3 and 27...Qxb2# e) 24. Rd2 Rxb1+! 25. Kxb1 Qb4+!
f) 24. Re2 Nxe2 25. Bxe2 Rxb1+ 26. Kxb1 Rb8+ 27. Ka1 (27. Bb2 Qb4 ) 27...c3 as Black threatens Qb4, to which there is no adequate defence g) 24. Qc3! Qb4! 25. Qxb4 Nxc2+ 26. Kb2 Nxb4 and Black has a tremendous and rich position; and for this, he has temporarily sacrificed only one in the force count, and is sure to recoup this material with interest. LTJ |
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| Jun-10-12 | | LoveThatJoker: I had actually seen this game before, but thankfully couldn't recall how the game ended after 23. Qg3. I went with 23...Nd4! - which is sound, interesting and winning, but objectively second to 23...Rxb1+!!. 0.80 out of 1 is fair for today.
I end my week with 5.80 out of 7 for a pass!
LTJ
PS. For the sake of truth and objectivity, it should be noted that in my <f) 24. Re2 Nxe2 25. Bxe2 Rxb1+ 26. Kxb1 Rb8+ 27. Ka1 (27. Bb2 Qb4 ) 27...c3> line, Stockfish finds 28. Qg4/Qf4 as a defensive try. This said, after 28...Qa5 (also given by Stockfish) Black's advantage is still sizeable with at least (-2.00). |
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| Jun-10-12 | | Al2009: White's position is so bad, that 23...d4 is winning too.
If 24. Ba3 Nb4 25. Re2 d3 etc.
If 24. Bg2 d3 25. Ba3 (25 Bxc6 Rxb1+ 26. Kxb1 Rb8+ 27 Bb2 Qd4 etc.) Qd4+ 26. c3 Rxb1+ etc. It's just a question of tastes... |
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| Jun-10-12 | | hugogomes: oh, sunday bloody sunday. |
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| Jun-10-12 | | whiteshark: <23...Rxb1+ 24.Kxb1 Rb8+ 25.Ka1 c3> and that's it. Even on Sunday. |
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| Jun-10-12 | | morfishine: Got it up to <27.Bd3> but played <27...Qa5> |
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| Jun-10-12 | | morfishine: <Tiggler> On your comment <Earlier posters (in 2004) also offered 22. Qe3 as a possibly winning improvement for W> Yes, but after <22...Qb4> white is lost |
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| Jun-10-12 | | gofer: White's position is fubar. Okay black is a bishop down for a single pawn, but black's position
is so superior that I am suprised white got this far without resigning. The king on a1 blocked
in by its own pawn and knight, but the open diagonal and file is just horrid to defend. My plan
would be separate the queen from defense of the b file and the end would be inevitable! <23 ... Rxb1+>
<24 Kxb1 Rb8+>
25 Bb2 Qb4 
<25 Ka1 c3!>
The threat is 26 Qb4 Ba3 27 Qxa3 Rb1 28 Rb2! mating, so white must extract its bishop from c1
to stop Qb1/Qb2# and that is going to be difficult considering white has just lost control of
the dark squares on b2 and d2!
25 ... Be3 26 Qa3 Rb1 27 Rb2! mating
25 ... Bb2 26 Rxb2 Rb1 27 Qa3 mating
<25 Bd2 Nb4!>
Black now has the threat of 26 ... Nxc2#
26 Rc1 cxd2 mating
26 Bc3 Qa5/Qc4 mating
So has white got a better defense against 25 ... c3 than 26 Bd2? Time to check...
~~~
:-) |
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| Jun-10-12 | | sevenseaman: #88072
This is from a famous game I do not seem to recall. I remember the first move because it was so outre that people failed to easily see the rationale behind it for quite some time. I am searching for the source game but if some one remembers please tell me. 
click for larger viewBlack to play and win. |
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| Jun-10-12 | | Chessdreamer: <sevenseaman> Spassky vs Fischer, 1972 |
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| Jun-10-12 | | David2009: E Terpugov vs Petrosian, 1957 Black 23...? Interesting devlopment by White - a piece up but on the back foot one might say. Somehow one
doesn't expect Petrosian to be playing brilliant combinations.
Try 23...Rxb1+ foreseeing as main line 24.Kxb1 Rb8+ 25.Ka1 Nxe5 26.Rxe5 Qxf2 27.Qxf2 Bxe5+ 28.c3 Bxc3+ 29.Bb2 Bxb2+
30.Qxb2 Rxb2 31 Kxb2 and White has a won endgame. Back to the drawing board. 26...Qxf2 is too rustic try 26...Qb6
27.Bf4 no better. Try 25...Qb6 26.Bf4 Nb4 27.Qc3 Qxf2 and White a R ahead is under pressure. This is stretching
my powers of analysis. Time to check:
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Got the first couple of moves then nowhere near. Here's the position just before White plays 23.Qg3:
click for larger view
with a link to Crafty End Game Trainer to try out alternative White defences: http://www.chessvideos.tv/endgame-t... The brilliant robot finds the alternative win 23...Nd4 24.Rxd4 Rxb1+ 25.Kxb1 Rb8+ 26.Ka1 Qxd4+ 27.c3 Qb6 28.Bd3 (if 28.Ba3 Bf8!) 28...cxd3 29.Qxd3 Qxf2 and Black is a Pawn up with a raging attack. Here's the puzzle position colours reversed:
click for larger view
with a corresponding link to Crafty End Game Trainer:
http://www.chessvideos.tv/endgame-t... Against Petrosian's line the stubborn robot chooses the colours-reversed equivalent of 26.Bb5 Rxb5 27.Qg4 d4 28.Qe2 but is soon forced to surrender decisive material after 27...d4. Enjoy finishing the line off (further colours-reversed link: http://www.chessvideos.tv/endgame-t...). |
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| Jun-10-12 | | sevenseaman: < morfishine: Got it up to <27.Bd3> but played <27...Qa5>> That's a win too. (Black threatens 28...Qxa2#).
I do not see a White resource. Who stopped you from getting the win as under? 27...Qa5 28. a4 Qxa4+ 29. Kb1▢ Qa2+ 30 Kc1▢ Qb2# Cheer up, winner. |
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| Jun-10-12 | | sevenseaman: < Chessdreamer: <sevenseaman> Spassky vs Fischer, 1972> Thanks. Its game #12. |
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| Jun-10-12 | | morfishine: <sevenseaman> Actually puzzle 88072 is from game 5 of Fischer vs Spassky 1972. When Fischer played <27...Bxa4> Spassky reportedly "jumped" up from his chair...I would've loved to have seen that |
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| Jun-10-12 | | sevenseaman: <morf> Game #5 Fischer played White. The position is from Game #12 when Fischer played Black. I've checked up and replayed the game as well. 27...Bxa4 and Spassky resigned when he was still in the air when he 'jumped up from his chair' as you say. Here is the link to the game; Spassky vs Fischer, 1972. |
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| Jun-10-12 | | bachbeet: I saw the first couple moves but didn't see that the knight had a huge role in the win. No points for me. |
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| Jun-10-12 | | dufferps: Yes. Petrosian's 23.Rxb1+ was the key move, forcing 24.Kxb1 Rb8+. But I think Terpugov would have fared better by playing 25.Bb2. I see lots of variations from that point, and most of them involve white losing his Queen, but I don't see the quickly forced checkmate that followed his 25.Ka1 I'll have to look further and also read the other kibitzes to see if white could still have a quick win. |
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| Jun-10-12 | | dufferps: Well, I just posted that I thought Terpugov would have fared better with 25.Bb2. But I must take it back.
25.Bb2 c3 -- and white is helpless to prevent 26. ... Qa3, 27. ... Qxb2# except by Qxc3 to be followed by ... Qxc3 and ... Qxb2# |
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| Jun-10-12 | | Timetraveller: <sevenseaman>: Just for the sake of correctness, Fischer had white in the even games in Spassky - Fischer 1972. This position is in fact from game 5 of that match when Fischer had Black. |
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Jun-10-12
 | | chrisowen: Wash over board 23...rxb1+ 24.kxb1 rb8+ 25.ka1 c3 fetching looks in to be it juggernaut upon Evgengy low mood who starts going backward beneath in constant onslaught queen piles up Petrosian down to the tasks lug man rook one fell it swoop in entrance b1 stripping a3 defence at first glance ne5 appears on the cards often yet rigid re1 might plunder in g3 backs up rook ground turn to a d4 in murky it cant see possibilty through queen sweep across in to cover c2 so trickle in rb1 and c3 preventing cut off qg3 is my curious guess to attaining today's nirvana same in going I feel all this is right bd2 nb4 bd3 qc4 wow big bonanza casing him out he incorporate level it not known spectacular it honking glare down both barrells it hope in good mate a2 ruins him c2 or give him a lead nowhere to go Terpugov quite so. |
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| Jun-10-12 | | zakkzheng: why not rxb1+ kxb1 c3? |
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