Posers and Puzzles

Posers and Puzzles

  1. Standard memberEnglish Tal
    Phoneless
    Account suspended
    Joined
    01 Jun '06
    Moves
    25553
    03 Sep '06 13:28
    rObOkbOr
    pppppppp (lower case p's)
    OONOOOOO
    OOOOOnOO
    OOOOOONO
    OOnOOOOO
    PPPPPPPP (Upper case p's)
    ORBKOBOR
  2. Standard membercelticcountry
    Copyright ©2001-2006
    Eastbourne
    Joined
    20 Sep '04
    Moves
    16434
    03 Sep '06 15:04
    Nice Puzzle.

    Lowercase
  3. SubscriberBigDoggProblem
    Just...the Dogg
    bigdogghouse.com/RHP
    Joined
    26 Nov '04
    Moves
    123726
    03 Sep '06 17:494 edits
    Originally posted by English Tal
    rObOkbOr
    pppppppp (lower case p's)
    OONOOOOO
    OOOOOnOO
    OOOOOONO
    OOnOOOOO
    PPPPPPPP (Upper case p's)
    ORBKOBOR
    The Uppercase army has a different parity than lowercase army (one has made an even number of moves, and the other an odd number of moves, depending on how the board is rotated). A difference in parity happens only after White has moved. Since a lowercase 'n' is giving check to the enemy K, the lowercase pieces must be White.

    Proof Game:
    1.Nf3 Nc6 2.Ne5 Nd4 3.Nc6 Nf6 4.Nxd8 Nd5 5.Nc6 Ne3 6.Nc3 Nxd1 7.Nd5
    Nc3 8.Na5 Ncb5 9.Nc4 Nf3+ 10.Kd1 Rg8 11.Nf6+



    Edit: I knew this looked familiar. R. Smullyan, Chess Mysteries of Sherlock Holmes, p. 87.
  4. Standard memberEnglish Tal
    Phoneless
    Account suspended
    Joined
    01 Jun '06
    Moves
    25553
    03 Sep '06 19:24
    Originally posted by BigDoggProblem
    The Uppercase army has a different parity than lowercase army (one has made an even number of moves, and the other an odd number of moves, depending on how the board is rotated). A difference in parity happens only after White has moved. Since a lowercase 'n' is giving check to the enemy K, the lowercase pieces must be White.

    Proof Game:
    1.Nf3 Nc6 ...[text shortened]... t: I knew this looked familiar. R. Smullyan, Chess Mysteries of Sherlock Holmes, p. 87.
    You got me. Touche!
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