Posers and Puzzles

Posers and Puzzles

  1. DonationAcolyte
    Now With Added BA
    Loughborough
    Joined
    04 Jul '02
    Moves
    3790
    21 Apr '05 23:46
    The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.

    But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, but one in which the mate may take several moves to occur. How many moves away from the inevitable mate can you manage?
  2. Joined
    30 Dec '04
    Moves
    122161
    22 Apr '05 00:17
    Originally posted by Acolyte
    The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.

    But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, bu ...[text shortened]... e may take several moves to occur. How many moves away from the inevitable mate can you manage?


    OK this is my best effort.

    White has 2 black bishops as he has "queened" one of his pawns into a bishop (bishoped?) I think the position is legal.

    With white to move, it's inevtiable that he can only move his pawn, which will reach the 8th rank in 6 moves, before the black king can take it. No other pieces can move.

    Of course, this only works providing white doesn't turn his pawn into another bishop or a knight!!! 🙂
  3. Earth Prime
    Joined
    16 Mar '05
    Moves
    21936
    22 Apr '05 01:03


    I believe this is a good one. It's white to move and mate in 6, and I think it is unavoidable no matter what.
  4. Standard memberPalynka
    Upward Spiral
    Halfway
    Joined
    02 Aug '04
    Moves
    8702
    22 Apr '05 01:53
    Nice one! I think you can actually push both pawns one square back and make it 7, right?
  5. SubscriberBigDoggProblem
    Just...the Dogg
    bigdogghouse.com/RHP
    Joined
    26 Nov '04
    Moves
    123662
    22 Apr '05 01:55
    Originally posted by Acolyte
    The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.

    But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, bu ...[text shortened]... e may take several moves to occur. How many moves away from the inevitable mate can you manage?
    My best effort is here:

    http://www.redhotpawn.com/board/showthread.php?threadid=22215&page=2

    ...although it involves lots of promoted force!

    Noam Elkies has done a mate in 10 (!):

    http://www.xs4all.nl/~timkr/chess2/diary.htm

    Item 267.
  6. SubscriberBigDoggProblem
    Just...the Dogg
    bigdogghouse.com/RHP
    Joined
    26 Nov '04
    Moves
    123662
    22 Apr '05 01:56
    Originally posted by Palynka
    Nice one! I think you can actually push both pawns one square back and make it 7, right?
    No, because 1.d4 b6 would lead to stalemate.
  7. Earth Prime
    Joined
    16 Mar '05
    Moves
    21936
    22 Apr '05 01:571 edit
    Uhh. i guess. But they could both take a two stepper on the first one and I don't know if it counts when the PLAYER makes the CHOICE to drag it out, as I thought it was inevitable mates. So whatever.

    EDIT: never mind. Above poster is correct
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