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Hot Topic (More than 10 Replies) Position from Chess Exam Book (spoiler alert) (Read 12590 times)
micawber
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Re: Position from Chess Exam Book (spoiler alert)
Reply #6 - 02/26/10 at 08:13:03
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This is a link to a column by Tim Krabbe. 
The position shown in the original post was played in an actual game (Lasker - Loman, 1903). Krabbe also notes that Kf2 would have won. Tim also adds some further studies

http://www.xs4all.nl/~timkr/chess/prok.htm
  
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Dink Heckler
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Re: Position from Chess Exam Book (spoiler alert)
Reply #5 - 02/25/10 at 14:49:25
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Just received Dvoretsky and Pervakov's 'Studies for Practical Players', which highlights three Gurgenidze studies on this theme.

Here's one of them, simple but not easy:

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*

White to play and win
  
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chk
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Re: Position from Chess Exam Book (spoiler alert)
Reply #4 - 02/23/10 at 13:33:29
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Very well thought, thanks! (I somehow completely missed 9. ... Ra4 10. Qg8+).

I used to get Chess Today but that was a couple of years ago. But thanks, I'll have a look on the games mentioned.  Cool
  
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Dink Heckler
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Re: Position from Chess Exam Book (spoiler alert)
Reply #3 - 02/23/10 at 12:26:17
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(after 6...Ra2): 
7 Qe5 Kf8
8 Qd6 Ke8
9 Qd5, and now 9...Ra4 loses the g-pawn, so
9 ...Ra3
10 Kf4 Ra4
11 Kf5 and now Black will get mated if he tries to hold the g-pawn; White arranges to play Kg6 at a moment when the Q holds g4 from either e6 or d7.

By the way, if you get Chess Today, Alex Baburin spent two issues recently looking at interesting R vs Q possies with Black (it's always Black  Smiley ) trying to construct various fortresses. He cited 3(!) interesting examples from the recent Moscow Open:
Lintchevski - Nepomniachtchi, Bologan - Krylov, and Bareev - Grachev. He shows that all three were winning for White, but only Bologan brought home the bacon. All three are well worth a look.
  
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chk
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Re: Position from Chess Exam Book (spoiler alert)
Reply #2 - 02/23/10 at 11:51:48
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Yes that was the problem's idea (in this situation after ...Rh4 Black wins due to the Q-side pawns thrown in).

Your choice is interesting but I still see the Rook escaping (Ra2) - the fortress is still viable due to the King protecting Pg7 which stops Ph2 and the Rook protecting the Q-side and stopping the White King from advancing.. So I suppose you intend to advance the King as soon as possible after Ra2, but I cannot see it all in my head (I think a guided engine would be handy here).. Thanks I'll check it out when I'm back home
  
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Dink Heckler
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Re: Position from Chess Exam Book (spoiler alert)
Reply #1 - 02/23/10 at 11:30:57
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I'm sure I've seen a similar setup as a draw problem...after chasing the WK to g5, ..Rh4! followed by g5+ and Kg7...(well, its obviously still operative here as a subvariation)

In your particular example, 6 Kf3 would seem to set Black insoluble problems. No fortress for you  Smiley
  
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chk
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Position from Chess Exam Book (spoiler alert)
02/23/10 at 08:53:07
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Hello dear friends, I am currently working my way through an excellent book: Chess Exam by Igor Khmelnitsky, but I cannot figure out the correct continuation in a given position. I have also tried the position with Fritz12 and still find no solution so I need your (and your engines') help  Smiley.

Spoiler alert: for those working (or planning to work) through the book I am going to give part of the solution!



OK, the position is #86:

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Black to move

The author claims this is a win for White after 1. ... Rc3+ 2. Kf2!, but I was thinking when solving this that although White's best is indeed 2. Kf2!, Black can still achieve a draw by aiming for a fortress:

1. ... Rc3+ 2. Kf2! Rc2+ 3. Ke3 {best in my opinion-see below} Rxg2 {practically forced} 4. h8=Q+ Kf7 5. Qh5+ Ke7! {5. ... Rg6 loses to 6. Kf4 - the point of White's 3rd move} and due to the presence of Pd5 White cannot check in order to win the Black Rook, thus Black manages to play Rg6-Rf6 and create the sort of fortress Girkassa mentioned in a recent post (Black has the fortress even without the Q-side pawns; just plays Rf6-Rh6 and the King protects Pg7).

Fritz12 tried 5. Qb8 instead which seems pointless and I have also checked Igor's site but could not find a forum or any readers' feedback. So I thought what's the best place to discuss this? Bingo  Wink
  
"I play honestly and I play to win. If I lose, I take my medicine." - Bobby
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