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For Marco---possible Stockfish bug
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Marek Kwiatkowski



Joined: 14 Feb 2010
Posts: 541
PostPost subject: Re: For Marco---possible Stockfish bug    Posted: Sun Feb 19, 2012 5:37 pm Reply to topic Reply with quote
I found a next very interesting example with a logical solution.
[d]8/5p2/8/8/p7/rpK4p/1p3ppr/bQ1N1bqk w - -
   ::    ::    ::    ::
::    ::    :: BP ::    
   ::    ::    ::    ::
::    ::    ::    ::    
BP ::    ::    ::    ::
BR BP WK    ::    :: BP
   BP    ::    BP BP BR
BB WQ :: WN :: BB BQ BK

White King must catch the black Rook (a3) like "cat and mouse".
It is one of these positions which leads you to a fatal conclusion, that only human can
think, and machines are stupid and there is needed an artificial intelligence to solve such problem.

At first I did it much weaker and moved black Pawn one step up.
[d]8/8/5p2/8/p7/rpK4p/1p3ppr/bQ1N1bqk w - -
   ::    ::    ::    ::
::    ::    ::    ::    
   ::    ::    BP    ::
::    ::    ::    ::    
BP ::    ::    ::    ::
BR BP WK    ::    :: BP
   BP    ::    BP BP BR
BB WQ :: WN :: BB BQ BK


Now I tried Stockfish 2.1.1 with VALUE_DRAW = -1.
Code:

info depth 71
info currmove c3d4 currmovenumber 1
info nodes 1066926600 nps 248439 time 4294516
info currmove d1b2 currmovenumber 2
info currmove c3d2 currmovenumber 3
info nodes 1067469748 nps 248416 time 4297094
info currmove c3b4 currmovenumber 4
info depth 71 seldepth 28 multipv 1 score mate 32 lowerbound nodes 1068814645 np
s 248369 time 4303328 pv c3b4 a3a2 b4a5 a2a3 a5b6 a3a2 b6c7 a2a3 c7d6 a3a2 d6e7
f6f5 e7d6 a2a3 d6e5 a3a2 e5d4 a2a3 d4c5 a3a2 c5b4 a2a3 b4a3 f5f4 a3b4 f1d3 d1f2


After this Stockfish 2.1.1 with VALUE_DRAW = 0.
As it was excepted, it reaches a very high depth very quickly.
Code:

info depth 95 seldepth 15 multipv 1 score cp 0 nodes 682474575 nps 238514 time 2
861359 pv c3d2 a3a2 d2e3 f6f5 e3f4 a2a3 f4e3 a3a2

But now it stoped and after 2 next hours I terminated the solving.

Of course I tried to solve the original position with black Pawn on f7 too.
Stockfish 2.1.1 with VALUE_DRAW = -1 shows mate in 44 on depth 74. Maybe it was a lucky.
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Subject Author Date/Time
For Marco---possible Stockfish bug Louis Zulli Tue Jan 31, 2012 5:49 pm
      Re: For Marco---possible Stockfish bug Marco Costalba Tue Jan 31, 2012 7:12 pm
      Re: For Marco---possible Stockfish bug Joona Kiiski Wed Feb 01, 2012 7:56 am
            Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 10:02 am
                  Re: For Marco---possible Stockfish bug Joona Kiiski Wed Feb 01, 2012 12:48 pm
                        Re: For Marco---possible Stockfish bug Louis Zulli Wed Feb 01, 2012 2:41 pm
                              Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 7:15 pm
                                    Re: For Marco---possible Stockfish bug Marco Costalba Wed Feb 01, 2012 7:23 pm
                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 9:05 pm
                                    Re: For Marco---possible Stockfish bug Joona Kiiski Wed Feb 01, 2012 8:32 pm
                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 9:02 pm
                                                Re: For Marco---possible Stockfish bug Joona Kiiski Thu Feb 02, 2012 8:30 am
                                                      Re: For Marco---possible Stockfish bug Marek Kwiatkowski Thu Feb 02, 2012 8:36 am
                                                            Re: For Marco---possible Stockfish bug Joona Kiiski Thu Feb 02, 2012 10:52 am
                                                                  Re: For Marco---possible Stockfish bug Marek Kwiatkowski Thu Feb 02, 2012 2:08 pm
                                                                        Re: For Marco---possible Stockfish bug Joona Kiiski Thu Feb 02, 2012 3:45 pm
                                                                              Re: For Marco---possible Stockfish bug Marek Kwiatkowski Thu Feb 02, 2012 5:32 pm
                                                                                    Re: For Marco---possible Stockfish bug david nash Thu Feb 02, 2012 6:14 pm
                                                                                    Re: For Marco---possible Stockfish bug Richard Vida Thu Feb 02, 2012 7:23 pm
                                                                                          Re: For Marco---possible Stockfish bug Marco Costalba Thu Feb 02, 2012 8:04 pm
                                                                                          Re: For Marco---possible Stockfish bug Robert Wagner Campos Thu Feb 02, 2012 8:59 pm
                                                                                          Re: For Marco---possible Stockfish bug Uri Blass Thu Feb 02, 2012 10:41 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Thu Feb 02, 2012 9:01 pm
                                                                                          Re: For Marco---possible Stockfish bug Sven Schüle Thu Feb 02, 2012 11:28 pm
                                                                                          Re: For Marco---possible Stockfish bug Robert Wagner Campos Fri Feb 03, 2012 12:26 pm
                                                                                          Re: For Marco---possible Stockfish bug Uri Blass Fri Feb 03, 2012 2:14 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Fri Feb 03, 2012 2:21 pm
                                                                                          Re: For Marco---possible Stockfish bug Evert Glebbeek Fri Feb 03, 2012 2:41 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Fri Feb 03, 2012 2:58 pm
                                                                                          Re: For Marco---possible Stockfish bug Sam Hamilton Fri Feb 03, 2012 3:23 pm
                                                                                          Re: For Marco---possible Stockfish bug Evert Glebbeek Sat Feb 04, 2012 7:07 am
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Sat Feb 04, 2012 9:31 am
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Sun Feb 05, 2012 4:20 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Sun Feb 05, 2012 5:24 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 08, 2012 1:54 pm
                                                                                          Re: For Marco---possible Stockfish bug Joerg Oster Wed Feb 08, 2012 5:14 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 08, 2012 5:49 pm
                                                                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Sun Feb 19, 2012 5:37 pm
                                                                                          Re: For Marco---possible Stockfish bug Robert Wagner Campos Fri Feb 03, 2012 6:33 pm
                                                                                          Re: For Marco---possible Stockfish bug Robert Wagner Campos Fri Feb 03, 2012 6:15 pm
                                                                                          Re: For Marco---possible Stockfish bug Louis Zulli Sat Feb 04, 2012 1:50 am
                                                Re: For Marco---possible Stockfish bug Marek Kwiatkowski Fri Feb 03, 2012 2:08 pm
                                                      Re: For Marco---possible Stockfish bug Kevin Hearn Fri Feb 03, 2012 3:49 pm
                                                            Re: For Marco---possible Stockfish bug Marek Kwiatkowski Fri Feb 03, 2012 6:45 pm
                              Re: For Marco---possible Stockfish bug Joerg Oster Wed Feb 01, 2012 8:38 pm
                                    Re: For Marco---possible Stockfish bug Louis Zulli Wed Feb 01, 2012 9:14 pm
                                          Re: For Marco---possible Stockfish bug Joerg Oster Thu Feb 02, 2012 7:23 am
                                                Re: For Marco---possible Stockfish bug Marek Kwiatkowski Thu Feb 02, 2012 8:29 am
                                    Re: For Marco---possible Stockfish bug Louis Zulli Wed Feb 01, 2012 9:38 pm
                                          Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 9:54 pm
                                                Re: For Marco---possible Stockfish bug Louis Zulli Wed Feb 01, 2012 11:05 pm
                                                      Re: For Marco---possible Stockfish bug Marek Kwiatkowski Wed Feb 01, 2012 11:11 pm
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