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What engine can see the best move Bf8+!
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Marek Kwiatkowski



Joined: 14 Feb 2010
Posts: 535
PostPost subject: Re: What engine can see the best move Bf8+!    Posted: Fri Apr 13, 2012 10:14 am Reply to topic Reply with quote
The good result of Houdini and Critter can be accidental. It seems that both the engines are not experts in zugzwang positions.
Stockfish can solve it on a very high depth (time) thanks to problems with VALUE_DRAW = 0;
My Sting solves it in 19 mintes on a very slow computer.

[d] 6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1
   ::    ::    :: WR ::
::    ::    ::    ::    
   :: BP WB    ::    BK
::    WP    ::    :: BP
   ::    ::    BP    BQ
::    ::    :: WP ::    
   ::    :: WP :: WK ::
::    ::    ::    ::    


Sting SF 2.0 (beta):
Code:
 
 33/46   09:11    493.008.329   894.091    0,00   Rg8e8 Qh4g3+ Kg2f1 Qg3h3+ Kf1g1 Kh6g6 Bd6xf4 Qh3h4 Bf4d6 Kg6f7 Re8e4 Qh4e1+ Kg1g2 h5h4 Re4e7+ Kf7f6 Re7e8 Qe1c1 Re8e4 h4h3+ Kg2xh3 Qc1f1+ Kh3g4 Qf1g1+ Bd6g3 Qg1xc5 Bg3h4+ Kf6f7 Re4e7+ Kf7g6 Re7e6+ Kg6f7 Re6f6+ Kf7g7
  34+   19:00    887.273.483   777.766   +0,08   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2c4 Bf6a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  34+   19:01    887.722.040   777.648   +0,16   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2c4 Bf6a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  34+   19:02    888.489.821   777.511   +0,28   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1c1 Kg2h2 Qc1c4 Kh2h1 Qc4c2 Bf6a1 Qc2c4 e2e4 f4xe3/ep Rg7g4+
  34+   19:05    890.489.703   777.094   +0,73   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1c1 Kg2h2 Qc1c4 Kh2h1 Qc4c2 Bf6a1 Qc2c4 e2e4 f4xe3/ep Rg7g4+
  34+   19:06    891.013.252   777.000   +1,14   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 h5h4 Kg2h2
  34+   19:11    894.206.774   776.589   +2,67   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 h5h4 Kg2h2
  34+   19:19    900.172.186   776.114   +4,04   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e3 Rg7e7+ Kh8g8 Re7xe3 f4xe3 Kh1g2 Kg8f7 Bf6d4 e3e2 Kg2f2 h5h4 Kf2xe2 Kf7g6 Ke2f2 Kg6h5 Kf2g2 Kh5g5 Bd4e3+ Kg5f6 Kg2h3 Kf6e5 Kh3xh4 Ke5e6 Kh4g4 Ke6d5 f3f4 Kd5e6 f4f5+ Ke6e5 Kg4g5
  34+   19:32    909.108.248   775.679   +6,09   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2xf3+ Kh1h2 Qf3e3 Bf6a1 h5h4 Ba1b2 Qe3xc5 Rg7g5+
 34/55   19:38    913.254.956   775.258   +6,98   Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Kh1xh2 Kh6g5 Kh2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d7 Kg4xf4 Kd7c8 Bd4e3 Kc8b7 Kf4g4 Kb7a6 f3f4 Ka6b7 f4f5


I modified this position to try to prove that the result of Houdini and Critter can be accidental.

[d] 7k/6R1/2p5/2P4p/5p1q/5P2/1B2P3/6K1 b - - 0 1
   ::    ::    ::    BK
::    ::    ::    WR    
   :: BP ::    ::    ::
::    WP    ::    :: BP
   ::    ::    BP    BQ
::    ::    :: WP ::    
   WB    :: WP ::    ::
::    ::    ::    WK    


After 1...Qe1+ 2.Kh2 Qh4+ 3.Kg2 Qe1 4.Bf6 it leads to known position from previous solution.
But now, the main zugzwang position
[d] 7k/6R1/2p2B2/2P4p/5p2/5P2/4P1K1/4q3 b - - 0 1
   ::    ::    ::    BK
::    ::    ::    WR    
   :: BP ::    WB    ::
::    WP    ::    :: BP
   ::    ::    BP    ::
::    ::    :: WP ::    
   ::    :: WP :: WK ::
::    ::    BQ    ::    

appears after the logic move Bf6.

Sting solves it quickly.

[d] 7k/6R1/2p5/2P4p/5p1q/5P2/1B2P3/6K1 b - - 0 1
   ::    ::    ::    BK
::    ::    ::    WR    
   :: BP ::    ::    ::
::    WP    ::    :: BP
   ::    ::    BP    BQ
::    ::    :: WP ::    
   WB    :: WP ::    ::
::    ::    ::    WK    


Sting SF 2.0 (beta):
Code:

 37/26   01:48     73.698.635   677.588    0,00   Qh4e1+ Kg1h2 Qe1h4+ Kh2g1
  38-   01:56     79.491.692   682.695   -0,08   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6b2 Qe6a2 Bb2d4 Qa2c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   01:57     80.048.240   682.987   -0,16   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6b2 Qe6a2 Bb2d4 Qa2c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   02:01     83.281.432   684.474   -0,74   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6b2 Qe6a2 Bb2d4 Qa2c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   02:05     85.831.229   685.536   -1,15   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1c1 Kg2h2 Qc1c4 Bf6b2 Qc4a2 Bb2d4 Qa2c4 Bd4a1 Qc4c2 Kh2h1 Qc2c4 e2e4 h5h4 Ba1f6 h4h3 Bf6a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 Qc4xc5 Rg7g5+
  38-   02:12     91.339.350   689.514   -1,76   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   02:16     94.249.334   690.471   -2,67   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1c1 Kg2h2 Qc1c2 Bf6a1 Qc2c4 Kh2h1 Qc4c2 e2e4 Qc2c4 Ba1f6 Qc4e6 e4e5 Qe6c4 e5e6 Qc4xe6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   02:19     96.722.871   691.569   -4,04   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1c1 Kg2h2 Qc1c2 Bf6a1 Qc2c4 Kh2h1 Qc4c2 e2e4 Qc2c4 Ba1f6 Qc4e6 e4e5 Qe6c4 e5e6 Qc4xe6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1
  38-   02:39    110.893.568   697.373   -6,09   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Kh1xh2 Kh6h7 Kh2h3 Kh7g6 Kh3g4 Kg6f7 Kg4xf4 Kf7g6 Kf4g3 Kg6f5 Bd4e3 Kf5e5 f3f4+ Ke5f5 Kg3f3 Kf5g6 Kf3g4 Kg6h6 f4f5+ Kh6g7 Kg4g5 Kg7g8 Be3d4 Kg8f7 f5f6 Kf7f8 Kg5g6 Kf8g8 f6f7+ Kg8f8 Bd4g7+
  38-   03:06    130.786.713   700.679   -9,17   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 Qc4b5 Rg7b7+ Kh8g8 Rb7xb5 c6xb5 c5c6
 38/58   03:11    134.104.611   701.541   -7,75   Qh4e1+ Kg1h2 Qe1h4+ Kh2g2 Qh4e1 Bb2f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h4h3 Ba1f6 Qc4e6 Bf6d4 Qe6c4 Bd4a1 h3h2 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Kh1xh2 Kh6h7 Bd4e5 Kh7h6 Be5xf4+ Kh6g7 Bf4g5 Kg7f7 Bg5h4 Kf7e8 Kh2h3 Ke8d7 Bh4g5 Kd7c8 f3f4 Kc8c7 f4f5 Kc7d7 Kh3g4 Kd7c7 f5f6 Kc7d7 f6f7


What about others ? Very Happy
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Subject Author Date/Time
What engine can see the best move Bf8+! Jorge Pichard Tue Apr 10, 2012 6:51 am
      Re: What engine can see the best move Bf8+! Robert Houdart Tue Apr 10, 2012 9:18 am
            Re: What engine can see the best move Bf8+! Jorge Pichard Tue Apr 10, 2012 11:16 pm
                  Re: What engine can see the best move Bf8+! om prakash Thu Apr 12, 2012 6:46 pm
            Re: What engine can see the best move Bf8+! Dan Andersson Wed Apr 11, 2012 1:07 am
                  Re: What engine can see the best move Bf8+! Jorge Pichard Wed Apr 11, 2012 1:52 am
                        Re: What engine can see the best move Bf8+! Sam Hamilton Wed Apr 11, 2012 3:37 am
                              Re: What engine can see the best move Bf8+! Jorge Pichard Wed Apr 11, 2012 8:21 am
                                    Re: What engine can see the best move Bf8+! Sam Hamilton Wed Apr 11, 2012 12:47 pm
                                          Re: What engine can see the best move Bf8+! Jorge Pichard Wed Apr 11, 2012 5:10 pm
                                                Re: What engine can see the best move Bf8+! Sam Hamilton Thu Apr 12, 2012 12:44 am
                                                      Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 1:33 am
            Re: What engine can see the best move Bf8+! kgburcham Wed Apr 11, 2012 3:07 am
            Re: What engine can see the best move Bf8+! Ernest Bonnem Wed Apr 11, 2012 2:49 pm
            Re: What engine can see the best move Bf8+! Uri Zlatnik Thu Apr 12, 2012 1:56 am
                  Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 2:12 am
                  Re: What engine can see the best move Bf8+! Ernest Bonnem Thu Apr 12, 2012 7:54 am
                        Re: What engine can see the best move Bf8+! Uri Zlatnik Thu Apr 12, 2012 8:05 am
                        Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 12:20 pm
                              Re: What engine can see the best move Bf8+! Uri Zlatnik Thu Apr 12, 2012 1:24 pm
                                    Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 2:58 pm
                                          Re: What engine can see the best move Bf8+! Matthew R. Brades Thu Apr 12, 2012 5:05 pm
                                                Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 5:15 pm
                                                      Re: What engine can see the best move Bf8+! Martin Hertz Thu Apr 12, 2012 5:58 pm
                                                      Re: What engine can see the best move Bf8+! Tano-Urayoan Russi Roman Thu Apr 12, 2012 8:14 pm
                                                            Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 9:45 pm
                                                            Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 9:45 pm
                                                            Re: What engine can see the best move Bf8+! Graham Banks Thu Apr 12, 2012 9:53 pm
                                                                  Re: What engine can see the best move Bf8+! Marek Kwiatkowski Fri Apr 13, 2012 10:14 am
                                                                        Re: What engine can see the best move Bf8+! Gary Fri Apr 13, 2012 2:08 pm
                                                                              Re: What engine can see the best move Bf8+! Marek Kwiatkowski Fri Apr 13, 2012 7:17 pm
                                                                                    Re: What engine can see the best move Bf8+! Gary Sat Apr 14, 2012 2:10 am
                                                                        Re: What engine can see the best move Bf8+! Marek Kwiatkowski Fri Apr 13, 2012 3:28 pm
                                                                              Re: What engine can see the best move Bf8+! Jorge Pichard Sat Apr 14, 2012 1:39 am
                                                                                    Re: What engine can see the best move Bf8+! Lucas Braesch Sat Apr 14, 2012 6:41 am
                                                                                          Re: What engine can see the best move Bf8+! Jorge Pichard Sat Apr 14, 2012 7:19 am
                                                                                          Re: What engine can see the best move Bf8+! Jorge Pichard Sat Apr 14, 2012 6:44 pm
            Re: What engine can see the best move Bf8+! Jorge Pichard Sun Apr 22, 2012 11:33 pm
      Re: What engine can see the best move Bf8+! Louis Zulli Tue Apr 10, 2012 10:21 am
            Re: What engine can see the best move Bf8+! Andrea Sorcinelli Tue Apr 10, 2012 11:41 am
                  Re: What engine can see the best move Bf8+! Zlatin Stoyanov Tue Apr 10, 2012 12:13 pm
                        Re: You don't consider Komodo and Hannibal Modern Engines ? Jorge Pichard Tue Apr 10, 2012 12:52 pm
                              Re: You don't consider Komodo and Hannibal Modern Engines ? Jorge Pichard Tue Apr 10, 2012 7:05 pm
                        Re: What engine can see the best move Bf8+! Louis Zulli Tue Apr 10, 2012 8:03 pm
      Re: What engine can see the best move Bf8+! Jesús Muñoz Wed Apr 11, 2012 11:07 am
      Re: What engine can see the best move Bf8+! Gary Wed Apr 11, 2012 12:16 pm
            Re: What engine can see the best move Bf8+! Jorge Pichard Thu Apr 12, 2012 12:10 am
                  Re: Can you make this version available for more testing ? Jorge Pichard Thu Apr 12, 2012 4:54 pm
                        Re: Can you make this version available for more testing ? Gary Fri Apr 13, 2012 3:20 pm
                              Re: Can you make this version available for more testing ? Jorge Pichard Sat Apr 14, 2012 12:57 am
                                    Re: Can you make this version available for more testing ? Gary Sat Apr 14, 2012 2:12 am
      Re: Komodo Finally solve this position Jorge Pichard Mon Apr 23, 2012 9:06 pm
            Re: Komodo Finally solve this position Jorge Pichard Thu Apr 26, 2012 11:04 am
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