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Posers and Puzzles

Posers and Puzzles

  1. 02 Nov '07 11:32

    Shortest Proof Game in 4.0 moves (Fischer Random Chess)
  2. Subscriber sonhouse
    Fast and Curious
    02 Nov '07 13:59
    Originally posted by David113
    [fen]bqnrnkrb/pppppppp/8/8/8/8/PPPPPPPP/BQRKNRNB[/fen]
    Shortest Proof Game in 4.0 moves (Fischer Random Chess)
    How about three moves? Is that ok?
    1 N-f3 a5
    2 N-g5 a4
    3 NXh7 #
  3. 02 Nov '07 14:27
    Originally posted by sonhouse
    How about three moves? Is that ok?
    1 N-f3 a5
    2 N-g5 a4
    3 NXh7 #
    A proof game is usually a game where you show the moves to obtaining a legal position. But I am unfamiliar with Fischer random chess starting position. Would someone more knowledgeable clarify?
  4. Subscriber sonhouse
    Fast and Curious
    02 Nov '07 14:34 / 1 edit
    Originally posted by ilywrin
    A proof game is usually a game where you show the moves to obtaining a legal position. But I am unfamiliar with Fischer random chess starting position. Would someone more knowledgeable clarify?
    Ok, read a wiki about it so it looks to me like it would have to be Knights out, knights in kind of thing.
    1 N(g)-f3 N-f6
    2 N g1 N-e8
    3 N(e)-f3 N(c)d6
    4 N-E1 N-C8
    As for the Fischer Random thing, there are 960 legal starting positions, this being just one.
  5. 02 Nov '07 14:46 / 2 edits
    I think I've got it.

    The problem asks you to find a valid Fischer Random game ending in this position after 4 moves. Note this isn't a valid Fischer Random starting position - I think white and black have to be set up the same.

    So: start from the following position:



    Then the game goes:

    1. Nd3 Nf6
    2. Rc1 Rg8
    3. Kd1 Kf8
    4. Ne1 Ne8
  6. Subscriber sonhouse
    Fast and Curious
    02 Nov '07 14:52 / 1 edit
    Originally posted by mtthw
    I think I've got it.

    The problem asks you to find a valid Fisher Random game ending in this position after 4 moves. Note this isn't a valid Fisher Random starting position - I think white and black have to be set up the same.

    So: start from the following position:

    [fen]bqnrkrnb/pppppppp/8/8/8/8/PPPPPPPP/BQNRKRNB[/fen]

    Then the game goes:

    1. Nd3 Nf6
    2. Rc1 Rg8
    3. Kd1 Kf8
    4. Ne1 Ne8
    So you are turning it into a valid random fischer thing?
  7. 02 Nov '07 15:00
    Originally posted by sonhouse
    So you are turning it into a valid random fischer thing?
    I'm turning it from a valid Fischer random thing into the given position. I think the difference between this and a usual proof game is that you aren't given the starting position.
  8. 03 Nov '07 16:13
    Originally posted by mtthw
    I think I've got it.

    The problem asks you to find a valid Fischer Random game ending in this position after 4 moves. Note this isn't a valid Fischer Random starting position - I think white and black have to be set up the same.

    So: start from the following position:

    [fen]bqnrkrnb/pppppppp/8/8/8/8/PPPPPPPP/BQNRKRNB[/fen]

    Then the game goes:

    1. Nd3 Nf6
    2. Rc1 Rg8
    3. Kd1 Kf8
    4. Ne1 Ne8
    That is indeed correct