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  1. #1
    CC Grandmaster Basil's Avatar
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    Which pawn? Why? Glory or tears?

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    Black to play. Queen takes which pawn (e4 or g4) and win (somewhat trivially)? Take the wrong pawn and the match is a forced draw within but a few moves!

    Guessing the right pawn to take is not entirely straight forward, but proving it is somewhat more difficult.

    Answer posted in a few days. It is requested that stronger players only signal that they have the answer (as opposed to publishing it). Alternatively, publishing the answer in white text.

    I found this position most instructive. Its the sort of error that I would be likely to play OTB. [Game from Possum: Axiom v Duggan, correspondence, chesschat].
    Last edited by Basil; 19-01-2007 at 05:27 PM.
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  2. #2
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    I am too lazy to set up the position on the chessboard and start moving pieces. but it looks like Qxe4 is no good due to a simple tactic (Qg5+ Kd7
    Rxd6+).

    I guess Qxg4 is stronger.
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  3. #3
    CC Grandmaster Basil's Avatar
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    I am going to answer now, because what I have posted is not strictly accurate. Michael is correct that Qxg4 is correct (unless you enjoy swimming with crocs). The reason is to be found below:

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    White's 40.Qg5+ forces black to find the very difficult 40...Kf7, leaving the d8 rook en prise:

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    but the rook is immune as black mates with rolling checks. Psychologically very hard for some (me).

    The fatal error, 40...Kd7 allows (as Michael suggested) 41.Rxd6+ 41...Kxd6 42.Qxd8 ++
    Alternatively, protecting the rook with 40...Ke7 allows 41.Qg8+ forcing a perpetual check in order to avoid the aforementioned mate.

    Ouch!
    Last edited by Basil; 19-01-2007 at 06:04 PM.
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  4. #4
    Monster of the deep Kevin Bonham's Avatar
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    Quote Originally Posted by Howard Duggan
    White's 40.Qg5+ forces black to find the very difficult 40...Kf7, leaving the d8 rook en prise:
    Isn't black still then winning (albeit not convincingly) after 40...Kf7 ? After 41.Rf1+ Ke8! 42.Rf8+ (forced - White must not allow Kd7) Kxf8 White does not appear to have a perpetual even after retaking the rook.
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  5. #5
    CC Grandmaster Basil's Avatar
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    Yes black is still winning.

    I haven't constructed this well. I meant to illustrate that if black stayed next to the rook, he was lost or drawn at best.
    Last edited by Basil; 19-01-2007 at 09:26 PM.
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  6. #6
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    I obviously saw the draw in the line other than Kd7 but i just felt no need to post it cause its obvious. It is the Rxd6 trick that could be missed
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  7. #7
    Account Shoutbox Banned antichrist's Avatar
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    Having a quick glance at this it looks quite similar to endgame theory in Fred Reinfeld's book The Complete Chess Course - is that where it is dragged from?

  8. #8
    CC Grandmaster Basil's Avatar
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    Quote Originally Posted by antichrist
    Having a quick glance at this it looks quite similar to endgame theory in Fred Reinfeld's book The Complete Chess Course - is that where it is dragged from?
    Nope.

    Quote Originally Posted by Howard Duggan
    Game from Possum: Axiom v Duggan, correspondence, chesschat
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  9. #9
    CC Grandmaster Garrett's Avatar
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    Howie fills the breach

    Is this the new 'Grandmaster Theatre' Howie ?

    Cool.

  10. #10
    CC Rookie IM_bob's Avatar
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    What's wrong with queen takes g4?

    And if Kf7 Rf1+ Ke8 what about Ke8 Qg8+? Would that be a perpetual draw?

  11. #11
    Monster of the deep Kevin Bonham's Avatar
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    Also, why does Black need to take a pawn at all, eg what is wrong with ...d5 ?
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  12. #12
    CC Grandmaster Basil's Avatar
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    Quote Originally Posted by Kevin Bonham
    Also, why does Black need to take a pawn at all, eg what is wrong with ...d5 ?
    ...d5 is good. Computer suggests it. It was one of my candidates which I rejected on account of loosening the position (throwing the opponent an anchor).

    I'm starting to regret this post! I merely wanted to illustrate capturing either seemingly innocuous pawn had vastly different outcomes. I will double check the simplicity of my next puzzle
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