[Retros] series SPG

[Goran Wicklund]

> Jonathan Mestel found a cook, using 0-0.

> Here is another (shorter) try:

> 

> 

> 8/8/2B5/2BR3R/Q1PP3P/PPK1P1P1/3N1P2/7N

> +---+---+---+---+---+---+---+---+

> |   | . |   | . |   | . |   | . |

> +---+---+---+---+---+---+---+---+

> | . |   | . |   | . |   | . |   |

> +---+---+---+---+---+---+---+---+

> |   | . | B | . |   | . |   | . |

> +---+---+---+---+---+---+---+---+

> | . |   | B | R | . |   | . | R |

> +---+---+---+---+---+---+---+---+

> | Q | . | P | P |   | . |   | P |

> +---+---+---+---+---+---+---+---+

> | P | P | K |   | P |   | P |   |

> +---+---+---+---+---+---+---+---+

> |   | . |   | N |   | P |   | . |

> +---+---+---+---+---+---+---+---+

> | . |   | . |   | . |   | . | N |

> +---+---+---+---+---+---+---+---+

>  16 + 0  SPG 26



Jonathan found a cook also in this one, moving Bf1 via b5 instead
if via g2, and Ra1 via h1 instead of a2. This should fix it:

 +---+---+---+---+---+---+---+---+
 | B | . |   | . |   | . |   | . |
 +---+---+---+---+---+---+---+---+
 | . |   | . |   | . |   | . |   |
 +---+---+---+---+---+---+---+---+
 |   | . |   | . |   | . |   | . |
 +---+---+---+---+---+---+---+---+
 | . |   | B | R | . |   | . | R |
 +---+---+---+---+---+---+---+---+
 | Q | . | P | P |   | . |   | P |
 +---+---+---+---+---+---+---+---+
 | P | P | K |   | P |   | P |   |
 +---+---+---+---+---+---+---+---+
 |   | . |   | N |   | P |   | . |
 +---+---+---+---+---+---+---+---+
 | . |   | . |   | . |   | . | N |
 +---+---+---+---+---+---+---+---+
  16 + 0  SPG 26
  
  The bishop is now forced to go via g2.
  This does not work with the black units on board, but this should
  do:
 
  
 +---+---+---+---+---+---+---+---+
 |*R |*N |*B |*Q |*K |*B |*N |*R |
 +---+---+---+---+---+---+---+---+
 |*P |*P |*P |*P |*P |*P |*P | R |
 +---+---+---+---+---+---+---+---+
 |   | . | B | . |   | . |   | . |
 +---+---+---+---+---+---+---+---+
 | . |   | B | R | . |   | . |   |
 +---+---+---+---+---+---+---+---+
 | Q | . | P | P |   | . |   | P |
 +---+---+---+---+---+---+---+---+
 | P | P | K |   | P |   | P |   |
 +---+---+---+---+---+---+---+---+
 |   | . |   | N |   | P |   | . |
 +---+---+---+---+---+---+---+---+
 | . |   | . |   | . |   | . | N |
 +---+---+---+---+---+---+---+---+
  16 + 0  Onesided SPG 26
  
  Ra1 has to move hX-h7 which means 6 moves if it goes via h1.
  
  /Göran
  




  

>  Göran Wicklund

> 

> 

> > 

> > > From: Richard Stanley <rstan at math.mit.edu>

> > > To: retros at janko.at

> > > Date: Thu, 2 May 2002 11:22:12 -0400 (EDT)

> > > 

> > > 

> > > Here is a variation of Noam Elkies' request for a dual-free SPG in

> > > which every unit moves. Remove all Black units from the board. What is

> > > the maximum number of White units that can move in a dual-free series

> > > SPG? I can do 14 (if sound), but presumably that can be improved. The

> > > same question can be asked without first removing the Black units.

> > > 

> > > Richard

> > > 

> > 

> > Here is try to move 15 white units. It should also work with the

> > black units on board: 

> > 

> > 8/6Q1/5B2/R3RBN1/P3PP1K/1P1P2PP/2P5/N7

> > +---+---+---+---+---+---+---+---+

> > |   | . |   | . |   | . |   | . |

> > +---+---+---+---+---+---+---+---+

> > | . |   | . |   | . |   | Q |   |

> > +---+---+---+---+---+---+---+---+

> > |   | . |   | . |   | B |   | . |

> > +---+---+---+---+---+---+---+---+

> > | R |   | . |   | R | B | N |   |

> > +---+---+---+---+---+---+---+---+

> > | P | . |   | . | P | P |   | K |

> > +---+---+---+---+---+---+---+---+

> > | . | P | . | P | . |   | P | P |

> > +---+---+---+---+---+---+---+---+

> > |   | . | P | . |   | . |   | . |

> > +---+---+---+---+---+---+---+---+

> > | N |   | . |   | . |   | . |   |

> > +---+---+---+---+---+---+---+---+

> >  16 + 0  SPG 28  No black units on board

> >  

> >  

> >  Göran Wicklund

> > 

> > 

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