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Posers and Puzzles

Posers and Puzzles

  1. 18 Apr '08 15:57


    SER-S#42

    White makes 42 consecutive moves (without check - only the last move may be a check) to reach a position in which Black is forced to mate White in one move.
  2. Standard member preachingforjesus
    Iron Pillar
    18 Apr '08 22:14
    1.Ke3 2.e8=N 3.Nxf6 4.Ne4 5.f6 6.f7 7.f8=Q 8.Qxb8 9.Qf4 10.b8=B 11.Bxa7 12.Be4 e1=Q#

    I believe this results in:


    as this is not even close to forty two, I must be misunderstanding something
  3. 18 Apr '08 22:34 / 1 edit
    Originally posted by preachingforjesus
    1.Ke3 2.e8=N 3.Nxf6 4.Ne4 5.f6 6.f7 7.f8=Q 8.Qxb8 9.Qf4 10.b8=B 11.Bxa7 12.Be4 e1=Q#

    I believe this results in:
    [fen]8/8/P6p/7P/p2BNQ1p/4Kp2/P1k2P1P/4q1n1[/fen]

    as this is not even close to forty two, I must be misunderstanding something
    I think the word "force" is important. In your position Black can also move the a-pawn, the knight and the king instead of promoting.

    edit: oh and another problem i just noticed is, that black doesnt have to promote to queen. that makes it even more difficult.
  4. Standard member SwissGambit
    Caninus Interruptus
    19 Apr '08 05:53
    Got it.
  5. 21 Apr '08 03:06
    Originally posted by SwissGambit
    Got it.
    S'D (SwissGambit)
  6. Standard member preachingforjesus
    Iron Pillar
    29 Apr '08 20:13 / 1 edit
    Ive gotten to 45 in about 6 different ways. For example:

    1.e8=N 2.Nxf6 3.Ne4 4.f6 5.f7 6.f8=R 7.Rxf3 8.Ra3 9.Rxa4 10.Rb4 11.Rb1 12.Ra1 13.f4 14.f5 15.f6 16.f7 17.f8=B 18.Bxh6 19.Be3 20.h6 21.h7 22.h8=Q 23.Qxh4 24.Qe1 25.h4 26.h5 27.h6 28.h7 29.h8=Q 30.Qxb8 31.Qe5 32.b8=B 33.Bxa7 34.Bc5 35.a7 36.a8=B 37.Bd5 38.Bc4 39.a4 40.a5 41.a6 42.a7 43.a8=Q 44.Qad5

    45.Qxe2+ Nxe2#

    Can some one show me what i'm missing

    edit :: I'v just notice The piece on c4 must be a knight instead of a bishop
  7. Standard member SwissGambit
    Caninus Interruptus
    29 Apr '08 22:49
    Originally posted by preachingforjesus
    Ive gotten to 45 in about 6 different ways. For example:

    1.e8=N 2.Nxf6 3.Ne4 4.f6 5.f7 6.f8=R 7.Rxf3 8.Ra3 9.Rxa4 10.Rb4 11.Rb1 12.Ra1 13.f4 14.f5 15.f6 16.f7 17.f8=B 18.Bxh6 19.Be3 20.h6 21.h7 22.h8=Q 23.Qxh4 24.Qe1 25.h4 26.h5 27.h6 28.h7 29.h8=Q 30.Qxb8 31.Qe5 32.b8=B 33.Bxa7 34.Bc5 35.a7 36.a8=B 37.Bd5 38.Bc4 39.a4 40.a5 41.a6 42.a7 43.a8=Q ...[text shortened]... at i'm missing

    edit :: I'v just notice The piece on c4 must be a knight instead of a bishop
    That's the right idea. What you need to do now is work on efficiency. For example, the sequence 6.f8R 7.Rxf3 8.Ra3 9.Rxa4 10.Rb4 11.Rb1 is a lot of wasted moves with the White Rook. 3 of the moves are just 'setup' moves that do not capture a black pawn or control a necessary square around one of the Kings.

    Think of it this way. You MUST promote all the pawns to set up the selfmate at the end. It will take 25 moves just to get them all to the promotion rank. 42-25 = 17 moves. 17 moves divided by 8 pieces = 2 moves and change. You're allowed a mere 2 moves per promoted piece - and for most, you'll need one to capture a black pawn, and another to move away and control square(s) around a King.
  8. Standard member preachingforjesus
    Iron Pillar
    30 Apr '08 12:30
    Originally posted by SwissGambit
    That's the right idea. What you need to do now is work on efficiency. For example, the sequence 6.f8R 7.Rxf3 8.Ra3 9.Rxa4 10.Rb4 11.Rb1 is a lot of wasted moves with the White Rook. 3 of the moves are just 'setup' moves that do not capture a black pawn or control a necessary square around one of the Kings.

    Think of it this way. You MUST promote all th ...[text shortened]... one to capture a black pawn, and another to move away and control square(s) around a King.
    The big reason I kept coming up long Is the rook on a1 doesn't need to go to the back rank, just to the b-file; which reduces an earlier attemp by percicely 3 moves. and looks like:

    1.e8=N 2.Nxf6 3.Nd5 4.f6 5.f7 6.f8=Q 7.Qxf3 8.Qg2 9.f4 10.f5 11.f6 12.f7 13.f8=B 14.Bxh6 15.Be3 16.h6 17.h7 18.h8=R 19.Rxh4 20.Re4 21.h4 22.h5 23.h6 24.h7 25.h8=Q 26.Qxb8 27.Qe5 28.b8=B 29.Bxa7 30.Bc5 31.a7 32.a8=R 33.Rxa4 34.Rb4 35.a4 36.a5 37.a6 38.a7 39.a8=N 40.Nb6 41.Nc4 42.Qxe2+ Nxe2#

  9. 30 Apr '08 18:07
    Originally posted by preachingforjesus
    The big reason I kept coming up long Is the rook on a1 doesn't need to go to the back rank, just to the b-file; which reduces an earlier attemp by percicely 3 moves. and looks like:

    1.e8=N 2.Nxf6 3.Nd5 4.f6 5.f7 6.f8=Q 7.Qxf3 8.Qg2 9.f4 10.f5 11.f6 12.f7 13.f8=B 14.Bxh6 15.Be3 16.h6 17.h7 18.h8=R 19.Rxh4 20.Re4 21.h4 22.h5 23.h6 24.h7 25.h8=Q 26 ...[text shortened]... 37.a6 38.a7 39.a8=N 40.Nb6 41.Nc4 42.Qxe2+ Nxe2#

    [fen]8/8/8/2BNQ3/1RNKR3/4B3/2k1n3/8[/fen]
    Congrats, but how much time did you spend on that?!
  10. Standard member SwissGambit
    Caninus Interruptus
    01 May '08 06:07
    Originally posted by preachingforjesus
    The big reason I kept coming up long Is the rook on a1 doesn't need to go to the back rank, just to the b-file; which reduces an earlier attemp by percicely 3 moves. and looks like:

    1.e8=N 2.Nxf6 3.Nd5 4.f6 5.f7 6.f8=Q 7.Qxf3 8.Qg2 9.f4 10.f5 11.f6 12.f7 13.f8=B 14.Bxh6 15.Be3 16.h6 17.h7 18.h8=R 19.Rxh4 20.Re4 21.h4 22.h5 23.h6 24.h7 25.h8=Q 26 ...[text shortened]... 37.a6 38.a7 39.a8=N 40.Nb6 41.Nc4 42.Qxe2+ Nxe2#

    [fen]8/8/8/2BNQ3/1RNKR3/4B3/2k1n3/8[/fen]
    Well done.

    Note that white promoted exactly two of each kind of piece.