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  1. 24 Mar '17 16:23

    Three Chess Mazes for you to try. If unfamiliar with the term
    then the explanation of what a Chess Maze is provided.

    An appearance of a new guy 'The RHP Demon'
    He will ask me questions and I'll answer them.
    (an experiment really but anybody got a question?)

    Finishes as usual with the RHP 'Hall of Doom'

    Blog Post 354
  2. Subscriber BigDoggProblem
    The Advanced Mind
    24 Mar '17 18:40 / 2 edits
    Originally posted by greenpawn34
    [b]
    Three Chess Mazes for you to try. If unfamiliar with the term
    then the explanation of what a Chess Maze is provided.

    An appearance of a new guy 'The RHP Demon'
    He will ask me questions and I'll answer them.
    (an experiment really but anybody got a question?)

    Finishes as usual with the RHP 'Hall of Doom'

    Blog Post 354
    [/b]
    I liked the Chess Mazes - they were fun solving; not too hard. Except for the Bishop one. That one is troubling me.



    First, it seems something is missing in the stipulation; Bg7, Bxf8+ is too easy, so we must not be allowed to capture anything.

    Second, it is impossible for e1 to be the target square. Where did the Bishop come from to reach that square? Obviously not from any squares that already checked the King. The only other square left is h4. So where did it come from to reach h4? The only unguarded square is e7, which attacks the King, and would have solved the problem already.

    Edit: the Rook should be on f7. This also resolves the "capturing" issue.
  3. Standard member DeepThought
    Losing the Thread
    24 Mar '17 22:51
    I particularly liked the lemondrop game and HEPKAT's swindle. There's a reasonable explanation of how a tree pruning algorithm works on Wikipedia, but essentially if the algorithm finds a move one of whose replies leads to checkmate, or at least a provably worse position than some other option, there isn't any point in evaluating the other replies.

    https://en.wikipedia.org/wiki/Alpha-beta_pruning
  4. 25 Mar '17 04:01 / 1 edit
    Hi Deep Thought,

    I thought I'd stay away from the heavy techy side of things.
    I'm up to my neck when I talk about ply. Any deeper and I drown.
    (and I use to sell these things for a living - 1985-1992)

    Hi Big Dog,

    Thanks. I've corrected the Bishop one on the blog..

    As a reward and you enjoy them here are three slightly harder ones (correct ones)

    Recap for anyone just who just happened along.

    In all three positions just check the Black King without being captured.
    The Black pieces do not move unless they can take the piece.
    You are not allowed ot take a Black piece.





  5. Subscriber BigDoggProblem
    The Advanced Mind
    25 Mar '17 13:55
    Originally posted by greenpawn34
    Hi Deep Thought,

    I thought I'd stay away from the heavy techy side of things.
    I'm up to my neck when I talk about ply. Any deeper and I drown.
    (and I use to sell these things for a living - 1985-1992)

    Hi Big Dog,

    Thanks. I've corrected the Bishop one on the blog..

    As a reward and you enjoy them here are three slightly harder ones (correct ...[text shortened]... /2b3p1/4n2k/8/r7/4qb2/8/5R2 w - - 0 1[/fen]

    [fen]4r3/6q1/8/3b4/3b4/6k1/5N1n/8 w - - 0 1[/fen]
    Thanks, GP. Those are fun.

    The Rook ones are the most interesting. It seems like they can be made to do more convoluted changes of direction, along with visits to out-of-the-way squares that offer a tiny bit of maneuvering space.
  6. 26 Mar '17 13:11
    Hi Big Dog,

    I think you are now ready for a King Maze.

    The rules slightly differ.

    Only the White King moves. Black never moves.
    The White King CAN capture a piece or a pawn..

    Usual rules apply, the King must never move into check.

    Moving only the King checkmate Black. (5 moves)



    Moving only the King checkmate Black. (7 moves)

  7. Subscriber BigDoggProblem
    The Advanced Mind
    27 Mar '17 18:07
    Originally posted by greenpawn34
    Hi Big Dog,

    I think you are now ready for a King Maze.

    The rules slightly differ.

    Only the White King moves. Black never moves.
    The White King CAN capture a piece or a pawn..

    Usual rules apply, the King must never move into check.

    Moving only the King checkmate Black. (5 moves)

    [fen]4K2B/6b1/8/8/8/2kP4/1R6/8 w - - 0 1[/fen]

    Moving o ...[text shortened]... y the King checkmate Black. (7 moves)

    [fen]5R1R/1B1pbbKp/8/3p4/8/6p1/6k1/6r1 w - - 0 1[/fen]
    #1:
    Kf7, xg7, f6, e5, e4

    #2:
    Kxh7, g7, xf7, xe7, d6, xd5, d6
  8. Subscriber BigDoggProblem
    The Advanced Mind
    27 Mar '17 18:13 / 1 edit
    Here's a King maze that I composed. In this one, BOTH Kings move. The other pieces threaten squares but do not move.


    The goal is to get the white King to e1 without stalemating or checkmating black in the process.

    Edit: the position is not legal, I know.
  9. 28 Mar '17 09:39
    Before I start, Black is helping White to achieve this.
  10. Standard member DeepThought
    Losing the Thread
    28 Mar '17 11:00 / 4 edits
    Originally posted by greenpawn34
    Before I start, Black is helping White to achieve this.
    Hi greenpawn,

    Black does not help white, I think the answer is
    that black is constrained to move between g7 and g8 provided white doesn't block the defence of h7. So white has to go all round the board to get to d6 to take the first pawn, the direct route takes 20 moves and so white triangulates by going to g5 first to make the journey take 21 moves. That way black is blocking the bishop at the right time. Then white has to go all the way back again to drop the move again and take the next pawn. Repeating this process white eventually eats all the pawns and gets to e1.


    Hi BigDogg,
    I liked that, nice theme.
  11. 28 Mar '17 14:47
    Thanks deep thought, I saw the only King moves, I was just making sure.

    Hi Big Dog,

    This is actually an excellent composition and will blogged (with your permission.)
    It's 100 moves. Perfect.. One could use to show how to visualise 100 moves ahead.
    We are very lucky to have you.

  12. Subscriber BigDoggProblem
    The Advanced Mind
    28 Mar '17 18:52
    Originally posted by greenpawn34
    Thanks deep thought, I saw the only King moves, I was just making sure.

    Hi Big Dog,

    This is actually an excellent composition and will blogged (with your permission.)
    It's 100 moves. Perfect.. One could use to show how to visualise 100 moves ahead.
    We are very lucky to have you.

    [pgn]
    [FEN "4B1kb/2Pp3N/1Pb1p3/1P2p2K/1PPp1PN1/1RpQP1B1/3p1P2/R ...[text shortened]... tempo then it would be White to play here.} 97... Kg7 98. Kxc3 Kg8+ 99. Kxd2 Kg7 100. Ke1 [/pgn]
    Glad you liked it ... feel free to use it in a blog.
  13. 28 Mar '17 20:36
    Thanks Big Dog.

    It's better there than hiding in a thread. (I'll say I did it )
  14. Standard member Schlecter
    The King of Board
    29 Mar '17 20:02 / 1 edit
    Never hear about chess mazes before, just found another kind of chess mazes:

    Mazelog http://www.mazelog.com/show?N2

    But it seems chess mazes are mostly a single player game
  15. Subscriber vandervelde
    medieval punk rocker
    08 Apr '17 17:15
    Originally posted by Schlecter
    Never hear about chess mazes before, just found another kind of chess mazes:

    Mazelog http://www.mazelog.com/show?N2

    But it seems chess mazes are mostly a single player game
    Yep, it is chessturbation.