Please turn on javascript in your browser to play chess.
Posers and Puzzles

Posers and Puzzles

  1. Donation Acolyte
    Now With Added BA
    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. 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. 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 member Palynka
    Upward Spiral
    22 Apr '05 01:53
    Nice one! I think you can actually push both pawns one square back and make it 7, right?
  5. Subscriber BigDoggProblem
    The Advanced Mind
    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. Subscriber BigDoggProblem
    The Advanced Mind
    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. 22 Apr '05 01:57 / 1 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