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Shortest-proof-game challenge


  • 15 months ago · Quote · #101

    cobra91

    joseph_ward wrote:

    This is by no means the shortest, but I think I'll post it anyway to give others something to beat.

    37 moves.

     


    I don't like to be picky, but that isn't quite the same position. You'll have to make a minor adjustment for it to count.

  • 15 months ago · Quote · #102

    Michael-G

    Queens and kings not in their right place but he only needs 3 moves more to do it.

  • 15 months ago · Quote · #103

    joseph_ward

    Whoops, I missed that. Okay, 38 moves.

  • 15 months ago · Quote · #104

    cobra91

    ^ Nice. And you never know, that could be a winner...

  • 15 months ago · Quote · #105

    cobra91

    Time has expired for round 8, which means joseph_ward wins (see post #103). Round 9 begins when the next position is posted - hopefully it will be more... "eventful" than the last one was. Tongue out

  • 15 months ago · Quote · #106

    joseph_ward

    Here is the position for round 9.

  • 15 months ago · Quote · #107

    thb1973

    I believe that this position is impossible.

    White has 8 pieces, and black has 7.for the bottom four blacks to get there (and the top two), 8 pieces must be used. This includes white's a2, a3, and a4 pawns. To get them into position, black's a7 pawn must be used.

    Think about it.

  • 15 months ago · Quote · #108

    stubborn_d0nkey

    I think its possible, will try it later/tomorrow

  • 15 months ago · Quote · #109

    joseph_ward

    thb1973 wrote:

    I believe that this position is impossible.

    White has 8 pieces, and black has 7.for the bottom four blacks to get there (and the top two), 8 pieces must be used. This includes white's a2, a3, and a4 pawns. To get them into position, black's a7 pawn must be used.

    Think about it.

    I'm not sure exactly what you are describing.  If it turns out that the position is impossible, I can post another one.  I think it's legal, though.

  • 15 months ago · Quote · #110

    Michael-G

    We are trying these for days and suddenly you are telling us that you don't even know if it is legal and you will just post another?

    You haven't test it before posting it?You just made a position from your mind?

  • 15 months ago · Quote · #111

    stubborn_d0nkey

    What's the rule on editing other peoples work?

  • 15 months ago · Quote · #112

    Michael-G

    Amazing solution!!!Well done!!!

    p.s.Although the opening had some inaccuraciesLaughing

  • 15 months ago · Quote · #113

    thb1973

    I was mistaken; I counted the pieces wrong and it turns out that the a7 pawn can be used to move white's a2 pawn to the b file.

  • 15 months ago · Quote · #114

    stubborn_d0nkey

    Michael-G wrote:

    Amazing solution!!!Well done!!!

    p.s.Although the opening had some inaccuracies

    Yeah, I'm pretty new to this and I mainly wanted to show that it is possible so there can definitely be a shorter solution.

    In case I win, do I have to set up a diagram or can I use a textual problem. What I mean is can I give a few conditions that have to be met in the final position instead of giving a diagram (of course I would check if the positions can be met). I think I have a, IMO, cool problem  (I'll check if it is possible, but I'm 99% sure it is)

  • 15 months ago · Quote · #115

    MaartenSmit

    This is amazingly hard. The past 2 challenges have gone by and I haven't found a solution for any of them.

    Is there a specific way you guys look at these problems? Do you look at the pawn structure first? Do you make a plan which pieces end up where and in which order? Please help me! I feel like such an idiot :/

  • 15 months ago · Quote · #116

    joseph_ward

    @MaartenSmit

    This won't help with getting the shortest solution, but this is how I come up with solutions.

    In post #97, I looked at the pawn structure first and saw that White had to get his four pawns behind black's pawns.  I decided to do this one file at a time.  I decided to put a white pawn on c5, let black play bxc4, move a white pawn to d5, let black play exd4, move a white pawn to e5 (now that the e-file is clear), let black play fxe4, move a pawn up to f5, and play fxe4.

    After deciding on this plan, I needed to decide which pieces to let black capture.  I figured out that the piece on c4 could be a pawn, but pawns would need to be promoted to replace the other pieces.  This would take care of white's remaining 3 pawns.  This helped me come up with a game that worked, even though it was definately not the shortest possible.

  • 15 months ago · Quote · #117

    cobra91

    stubborn_d0nkey wrote:
     

    What's the rule on editing other peoples work?

    If you mean "borrowing" moves from someone else's answer, making small improvements, and posting the "augmented" version as your own, then there are no restrictions - as long as the latter sequence is shorter (even by just one move), it doesn't matter how similar it is to the former.

    This question first arose during round 2, so if you're curious as to why such tactics are allowed, you might want to read post #37 for my reasoning behind it. Of course, if I completely misinterpretted your question, and you meant something different, just say so.

    Btw, pretty efficient proof game for someone "new to this", so good job on that.

  • 15 months ago · Quote · #118

    cobra91

    stubborn_d0nkey wrote:
    In case I win, do I have to set up a diagram or can I use a textual problem. What I mean is can I give a few conditions that have to be met in the final position instead of giving a diagram (of course I would check if the positions can be met). I think I have a, IMO, cool problem  (I'll check if it is possible, but I'm 99% sure it is)

    Although it was never directly stated, the assumed rule up until now has been that the previous winner must diagram a specific position. However, your idea of simply giving a set of conditions to be met is a terrific suggestion that could certainly make things a lot more interesting. Could everyone else let me know what their opinion is on this? It's a rule change I wouldn't hesitate to make, but don't want to do so without some sort of consensus. Cool

  • 15 months ago · Quote · #119

    browni3141

    cobra91 wrote:
    stubborn_d0nkey wrote:
    In case I win, do I have to set up a diagram or can I use a textual problem. What I mean is can I give a few conditions that have to be met in the final position instead of giving a diagram (of course I would check if the positions can be met). I think I have a, IMO, cool problem  (I'll check if it is possible, but I'm 99% sure it is)

    Although it was never directly stated, the assumed rule up until now has been that the previous winner must diagram a specific position. However, your idea of simply giving a set of conditions to be met is a terrific suggestion that could certainly make things a lot more interesting. Could everyone else let me know what their opinion is on this? It's a rule change I wouldn't hesitate to make, but don't want to do so without some sort of consensus.

    Sounds interesting.

  • 15 months ago · Quote · #120

    browni3141


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