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Is this position legal? A two part problem.


  • 14 months ago · Quote · #21

    BigDoggProblem

    Ajatsatru wrote:
    BigDoggProblem wrote:
     

    OK - what you just said about the Bf8 'disappearing beneath the line of pawns' - apply that same reasoning to white's Bishop.

    Yes, even if some white knight took the black square bishop from beneath the white pawn structure, we would be at loss of one white piece to get the c7 pawn to h2 square. Sorry... just that it takes me a while to understand things lol

    Don't worry about it - it's meant to take some time to solve, especially for people who have not seen many retrograde problems.

  • 14 months ago · Quote · #22

    tmkroll

    I have two of Raymond Smullyan's books of retrograde puzzles. I imagine omnipaul (who was quite a bit clearer in explaining the solution than I) had also seen similar stuff before.

  • 14 months ago · Quote · #23

    BigDoggProblem

    tmkroll wrote:

    I have two of Raymond Smullyan's books of retrograde puzzles. I imagine omnipaul (who was quite a bit clearer in explaining the solution than I) had also seen similar stuff before.

    Those are good intro books. I have read Holmes and I started Arabian Knights recently.

  • 14 months ago · Quote · #24

    Ajatsatru

    BigDoggProblem wrote:
     

    Don't worry about it - it's meant to take some time to solve, especially for people who have not seen many retrograde problems.

    This is a very interesting concept of chess problems. Thank you for posting them here.

    Would you happen to know any online source where I could find more of such problems?

  • 14 months ago · Quote · #25

    BigDoggProblem

    Ajatsatru wrote:
    BigDoggProblem wrote:
     

    Don't worry about it - it's meant to take some time to solve, especially for people who have not seen many retrograde problems.

    This is a very interesting concept of chess problems. Thank you for posting them here.

    Would you happen to know any online source where I could find more of such problems?

    The Retro Corner is a good starting point.

  • 14 months ago · Quote · #26

    Ajatsatru

    Thanks BigDoggProblem, you are cool!

  • 14 months ago · Quote · #27

    BigDoggProblem

    Ajatsatru wrote:

    Thanks BigDoggProblem, you are cool!

    Cool

  • 14 months ago · Quote · #29

    Pippychess

    of course both of them are - likely no way

  • 14 months ago · Quote · #30

    tecnoecuador

    good

  • 14 months ago · Quote · #31

    soothsayer8

    BigDoggProblem wrote:

    tmkroll and omnipaul have it right. In the 2nd one, you need 6 black pawn captures on dark squares but you have only 5 white pieces that could have been sacrificed on dark squares. Position 2 is illegal.

    Position 1 is legal because the doubled pawn is on a white square, which means you only need 5 dark-square captures.

    I think this is the best summary! Well put, Mr. Dogg, and nice puzzle! =)

  • 14 months ago · Quote · #32

    BigDoggProblem

    Firestopr wrote:

    woowww. interesting puzzles! did u make these yourself?

    I did this one myself, although I knew of the idea from other retro puzzles.


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