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Is this position legal? A two part problem.


  • 22 months ago · Quote · #21

    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.

  • 22 months ago · Quote · #22

    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.

  • 22 months ago · Quote · #23

    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?

  • 22 months ago · Quote · #24

    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.

  • 22 months ago · Quote · #25

    Ajatsatru

    Thanks BigDoggProblem, you are cool!

  • 22 months ago · Quote · #26

    BigDoggProblem

    Ajatsatru wrote:

    Thanks BigDoggProblem, you are cool!

    Cool

  • 22 months ago · Quote · #28

    Pippychess

    of course both of them are - likely no way

  • 22 months ago · Quote · #29

    tecnoecuador

    good

  • 22 months ago · Quote · #30

    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! =)

  • 22 months ago · Quote · #31

    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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