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Weekly Endgame Study (110)

7 March 2009, 18.00 CET | Last modified: 14:22 | By Yochanan Afek  | Filed under: Weekly endgame study | Tags:

Weekly Endgame StudyEvery Saturday we present you an endgame study selected by IM Yochanan Afek: player, trainer, endgame study composer and writer. A week later the solution is published. Good luck solving!

M. Matous and J. Polasek
2002

White to play and win

Next week the solution.

Solution last week:

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4 Responses to “Weekly Endgame Study (110)”

  1. Eugene on March 8th, 2009 3:59 am

    1. d6 Qf8+
    2. Kh7 Qd8
    3. Qg4 Kd6
    4. Qe6+ Kc7 (K? Qe8)
    5. Ne8+ Kb7 (Kb8 Qd6+)
    6. Qd6
    Ka7
    7. Qc7+
    Q?
    7. d8
    Q?+
    7. Kg8 Q?+
    8. Kf7
    Qd8
    9. Ke6 K?
    10. Qc7
    Q?+
    9. Ke7 Qg5+
    10. Kf6 Qg7+
    11. Ke6
    Ka8
    7. Qc7.

    Those are the main variations I can think of that don’t involve blunders.

  2. Felix on March 9th, 2009 9:50 am

    1.d7 you mean. My line would be 1.d7 Qh3+ 2.Nh5! Qxh5 3.Kg8 Qh4 4.Qd1+ winning

  3. MvE on March 9th, 2009 11:34 am

    @Eugene:

    If your first move is 1. d6-d7, Black can play 1. …, Qf3-h3‚Ćand the pawn drops off.
    Except if White plays 2. Ng7-h5!! when taking the pawn is unwise because of the knight fork.And if 2. …, Qh3xh5‚Ć then 3. Kh8-g8! and Black has no sensible check.

    I looked up in a Nalimov tablebase if this queen ending was won, thereby depriving my own imagination the chance to find a further sparkle (if I could have found it at all).
    The ending is indeed won. Black’s best continuation is
    3. …, Qh5-h4
    4. Qg1-d1†, Kd5-e6
    5. d7-d8R!!
    The only move to win.
    5. …, Qh4-g5‚Ć
    6. Kg8-h7
    Should White have promoted to a queen, thereby covering the g5 square, he could not have captured the black queen anyway because of stalemate.
    6. …, Qg5-h4‚Ć
    But here the rook promotion makes a real difference. With a queen on d8, Black could have played 6. …, Qh5‚Ć! with a new stalemate if white captures, or with perpetual check otherwise.
    7. Kh7-g6
    Quite amazingly, the White King can ultimately escape perpetual check, if he seeks refuge at… b2(!). Interesting to replay this stage. Black’s problem is that White can sometimes interpose his queen on g4 and later b3, which would force a queen trade because of the position of Black’s king.

  4. Eugene on March 11th, 2009 2:26 am

    @MvE. Ah, you’re right. Sorry, my chess engine didn’t catch that, guess this Endgame is a bit too deep for Crafty to calculate (as Black) with a timer on (I’m kind of impatient).

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