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  1. Standard member SwissGambit
    Caninus Interruptus
    22 Jan '13 19:40 / 1 edit
    Valentin Rudenko
    1st place WCCT 1972-5

    White mates in 6

    Your only hint (see GP? I give them ) is "windmill".
  2. 22 Jan '13 19:58 / 1 edit
    I've just WIKI'd Windmill.

    "A windmill is a machine that converts the energy of wind into rotational
    energy by means of vanes called sails."

    What kind of clue is that?

    A first prize problem.

    This I will enjoy. Cheers.
  3. Standard member RJHinds
    The Near Genius
    22 Jan '13 21:44 / 3 edits
    Originally posted by SwissGambit
    Valentin Rudenko
    1st place WCCT 1972-5
    [fen]6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1[/fen]
    White mates in 6

    Your only hint (see GP? I give them ) is "windmill".
    At first glance, the move I would consider first is Rb8 discovered check and then take the Rook on g8. Is that okay so far? Or maybe gxh3 is better? Yes, now I think gxh3 is better first because the Rb8 discoverec check can still be played. Now to figure out what black's best move is after 1.gxh3.
  4. Standard member SwissGambit
    Caninus Interruptus
    22 Jan '13 22:18
    Originally posted by RJHinds
    At first glance, the move I would consider first is Rb8 discovered check and then take the Rook on g8. Is that okay so far? Or maybe gxh3 is better? Yes, now I think gxh3 is better first because the Rb8 discoverec check can still be played. Now to figure out what black's best move is after 1.gxh3.
    If you play Rb8+ and Rxg8, you're letting black's king run.
  5. Subscriber rookorbycrook
    rookorbycrook
    22 Jan '13 22:48
    cant see mate in six however g2xh3 bd5 rb2+ ka3

    rxd2 bf4 rfxf3 bdxf3

    rxa2+ kb4 bxf3 and white is better
  6. Standard member RJHinds
    The Near Genius
    22 Jan '13 22:49
    Originally posted by SwissGambit
    If you play Rb8+ and Rxg8, you're letting black's king run.
    I am getting to tired to think about it anymore now. I'm going to have to get some sleep. So I'm going with 1.gxh3 to start right now. I'll work on it some more later unless I come back and it is already solved.
  7. Standard member ChessPraxis
    Cowboy From Hell
    22 Jan '13 22:53
    Originally posted by RJHinds
    I am getting to tired to think about it anymore now. I'm going to have to get some sleep. So I'm going with 1.gxh3 to start right now. I'll work on it some more later unless I come back and it is already solved.
  8. Subscriber rookorbycrook
    rookorbycrook
    22 Jan '13 23:29 / 1 edit
    got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

    rb7 + ka3 rxf3 ++
  9. Standard member RJHinds
    The Near Genius
    23 Jan '13 01:02 / 1 edit
    Originally posted by rookorbycrook
    got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

    rb7 + ka3 rxf3 ++
    What happens if black plays 1...Rxg3 instead of 1...Rxh6 ?

    I think you got the right ending idea, but I still think 1.gxh3 is the best first move.
  10. Standard member RJHinds
    The Near Genius
    23 Jan '13 05:26 / 1 edit
    Originally posted by SwissGambit
    Valentin Rudenko
    1st place WCCT 1972-5
    [fen]6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1[/fen]
    White mates in 6

    Your only hint (see GP? I give them ) is "windmill".
  11. Standard member RJHinds
    The Near Genius
    23 Jan '13 05:47 / 1 edit
  12. Standard member RJHinds
    The Near Genius
    23 Jan '13 05:57 / 3 edits


    So how to continue for checkmate in 6?
  13. Standard member RJHinds
    The Near Genius
    23 Jan '13 07:12 / 1 edit
    Originally posted by RJHinds
    [pgn]
    [FEN "6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1"]
    1. gxh3 Bd5 2. Rb8+ Ka3 3. a8=Q Bxa8 4. Rb3+ Ka4 5. Rb2+ Ka3 6. Rxf3 {CHECKMATE!}
    [/pgn]
    This one does not work because of 6... Bxf3.
    The 2nd one is the only one that works, but black does not make best moves.
  14. Standard member RJHinds
    The Near Genius
    23 Jan '13 07:55
    Originally posted by rookorbycrook
    got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

    rb7 + ka3 rxf3 ++
    I can't come up with anything that covers everything that black might do. Your line works, however, 1...Rxg3 might be better for white since it guards f3 from your final checkmate move of Rxf3. Perhaps, there is something else in that line that could be done that I do not see after 1.g3 Rxg3. Have you figured that out?
  15. Standard member RJHinds
    The Near Genius
    23 Jan '13 08:45 / 5 edits
    Originally posted by rookorbycrook
    got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

    rb7 + ka3 rxf3 ++
    Okay, I see how your idea works now. That g3 first move seemed very unlikely move to me and I would never have considered it, if you had not brought it up. I almost dismissed it anyway, but I could not get my line to work.