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Prove that a position is legal and reachable.
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Arpad Rusz



Joined: 17 Apr 2010
Posts: 143
Location: Budapest
PostPost subject: Re: Prove that a position is legal and reachable.    Posted: Thu May 17, 2012 9:58 pm Reply to topic Reply with quote
Yes, using this program is tricky: you should paste the position not in FEN notation but in simple Forsyth notation followed in a second line by the number of plies:

rnbqkb1r/ppp2ppp/8/8/8/8/PPPPPPPP/RNBQKB1R
8


[D]rnbqkb1r/ppp2ppp/8/8/8/8/PPPPPPPP/RNBQKB1R w
BR BN BB BQ BK BB    BR
BP BP BP    :: BP BP BP
   ::    ::    ::    ::
::    ::    ::    ::    
   ::    ::    ::    ::
::    ::    ::    ::    
WP WP WP WP WP WP WP WP
WR WN WB WQ WK WB :: WR


There is only one solution in 4.0 moves:
1.Sg1-f3 Pe7-e5 2.Sf3xe5 Sg8-e7 3.Se5xd7 Se7-c6
4.Sd7xb8 Sc6xb8

Last edited by Arpad Rusz on Thu May 17, 2012 10:01 pm; edited 1 time in total
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Subject Author Date/Time
Prove that a position is legal and reachable. Dustin Yoder Wed May 16, 2012 11:23 am
      Re: Prove that a position is legal and reachable. Julien MARCEL Wed May 16, 2012 11:45 am
            Re: Prove that a position is legal and reachable. Arpad Rusz Wed May 16, 2012 1:22 pm
      Re: Prove that a position is legal and reachable. Uri Blass Wed May 16, 2012 1:28 pm
      Re: Prove that a position is legal and reachable. Ricardo Barreira Wed May 16, 2012 1:49 pm
            Re: Prove that a position is legal and reachable. Julien MARCEL Wed May 16, 2012 1:55 pm
                  Re: Prove that a position is legal and reachable. Sven Schüle Wed May 16, 2012 2:43 pm
                  Re: Prove that a position is legal and reachable. H.G.Muller Wed May 16, 2012 6:25 pm
                        Re: Prove that a position is legal and reachable. George Tsavdaris Sat May 19, 2012 2:22 pm
      Re: Prove that a position is legal and reachable. Edmund Moshammer Wed May 16, 2012 2:49 pm
            Re: Prove that a position is legal and reachable. George Tsavdaris Sat May 19, 2012 1:50 pm
      Re: Prove that a position is legal and reachable. Joona Kiiski Wed May 16, 2012 6:39 pm
            Re: Prove that a position is legal and reachable. H.G.Muller Wed May 16, 2012 6:50 pm
                  Re: Prove that a position is legal and reachable. Alex Brown Wed May 16, 2012 10:57 pm
                        Re: Prove that a position is legal and reachable. Sven Schüle Thu May 17, 2012 9:01 pm
                              Re: Prove that a position is legal and reachable. Sven Schüle Thu May 17, 2012 9:27 pm
                                    Re: Prove that a position is legal and reachable. Arpad Rusz Thu May 17, 2012 9:58 pm
                              Re: Prove that a position is legal and reachable. George Tsavdaris Sat May 19, 2012 2:40 pm
                                    Re: Prove that a position is legal and reachable. Sven Schüle Sat May 19, 2012 8:56 pm
                                    Re: Prove that a position is legal and reachable. Alex Brown Sat May 19, 2012 9:27 pm
                  Re: Prove that a position is legal and reachable. Uri Blass Thu May 17, 2012 2:55 am
                        Re: Prove that a position is legal and reachable. H.G.Muller Thu May 17, 2012 8:39 am
      Algorithm Ideas Dustin Yoder Wed May 16, 2012 6:48 pm
            Re: Algorithm Ideas fernando Sat May 19, 2012 5:12 pm
      Re: Prove that a position is legal and reachable. Robert Hyatt Thu May 17, 2012 9:59 pm
            Re: Prove that a position is legal and reachable. George Speight Fri May 18, 2012 2:34 am
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