Upgrade to Chess.com Premium!

possible or impossible?


  • 20 months ago · Quote · #161

    s0030135


    The second position is also possible:

  • 20 months ago · Quote · #162

    piphilologist

    edit: someone got it before me :(
  • 20 months ago · Quote · #163

    shoopi

    Congratulations to both of you!

     

    More positions coming up.

    which of these positions is legal? (composed by cobra91):

  • 20 months ago · Quote · #164

    andrewjmen

    here's another one, black can still castle on both sides but that doesn't really matter

  • 20 months ago · Quote · #165

    andrewjmen

    is it too hard or is it too easy that nobody wants to answer?

  • 20 months ago · Quote · #166

    shoopi

    Not many people are active in this thread, and those that are aren't always here. Give it time.

    Anyway, thanks for contributing for the thread. I'll give your position a shot.

  • 20 months ago · Quote · #167

    shoopi

    Alright here's the analysis:

    Black has promoted all of his pawns. In order to achieve that, he must have made a minimum of 6 captures with his pawns. White is missing exactly 6 pieces, so all of them must have been captured.

    This means that black's a, b, g, and h pawns couldn't have captured a piece on the way to promotion. Here I had to think about it, but it is possible thanks to black's missing bishops.

    What's nice about this position is the symmetry, as play is basically the same on both wings.

  • 20 months ago · Quote · #168

    andrewjmen

    you're right Shoopi!

  • 20 months ago · Quote · #169

    andrewjmen

    here´s the answer without promotion:



  • 20 months ago · Quote · #170

    shoopi

    That's true.

    Funny that both of our solutions took exactly 60 moves to complete Cool

    I know it can be done in less, but the question is, how much less? what is the least amount of moves necessary to reach this position?

    This might be a new fun challenge to work on (by the way, the problems I posted on 163# are still up for solving Smile)

  • 20 months ago · Quote · #171

    piphilologist

    56 moves, I didnt try #163 because its so difficult I don't know where to start :(
    EDIT: Game not working, can't be bothered to enter it in again but i had got it in 56 moves
  • 20 months ago · Quote · #172

    shoopi

    Maybe it's for the best, since now people can't copy what you already did and try to find a small improvement that you missed Tongue Out

    I'll try to do this now.

  • 20 months ago · Quote · #173

    shoopi

    Ok, I analysed the position for quite a bit and looked at many different ideas. Unfortunately, many did not seem to work.

     

    I managed to get 54 moves rather quickly, but then finding an improvement became much more difficult. Eventually I found a way to get 53 moves which, I believe is the best possible.

     

    Can anyone find 54 or 53 moves? or god forbid, a better score Cool

  • 20 months ago · Quote · #174

    shoopi

    Also, here's a guideline on how to approach the puzzles in #163:

    1) Can black get all of those promoted pieces?

    2) What were the last moves?

    I will also give a small hint straight away regarding which position is legal, to encourage people to try (highlight to see): Position 1 is illegal and position 2 is legal. So you might want to work on that one.

     If no one seems interested (or has given up) in trying, I will post the solution!

  • 20 months ago · Quote · #175

    piphilologist

    I got the 53 eventually, will try for 52 now :)

  • 20 months ago · Quote · #176

    shoopi

    piphilologist wrote:

    I got the 53 eventually, will try for 52 now :)


    Impressive! I wonder if we used the same method. I couldn't figure out a way to get 52, but I've seen crazier things happen!

  • 20 months ago · Quote · #177

    piphilologist

    shoopi wrote:
    piphilologist wrote:

    I got the 53 eventually, will try for 52 now :)


    Impressive! I wonder if we used the same method. I couldn't figure out a way to get 52, but I've seen crazier things happen!

    My method was (highlight to see)

    Shift all the white pieces along one to allow athe rooks on one side of the board an extra square for maneuvring

    I think 52 is impossible but don't know. I might have a go at that #163 tomorrow now I've got a hint to help me :)

  • 20 months ago · Quote · #178

    shoopi

    Yeah I think so too. We also probably used the same method to reach 53 moves. Here's mine:

  • 20 months ago · Quote · #179

    piphilologist

    52Tongue Out , the white first-rank-shifting was unneccesary but I had put it in anyway and didnt feel like re-entering the game



  • 20 months ago · Quote · #180

    piphilologist

    For #163 the last white move must have been a pawn move (or for #1 1.Rh5+ N4xh5# but I doubt the composer left any spare white pieces)

    In position 2 Black can play N4h5# with the same position as #1 except for a rook. But I have no idea why f5 would be a legal rook position and c4 not, I suppose I'll only figure out if i do loads of analysis of the position


Back to Top

Post your reply: