# [Retros] series SPG

Goran Wicklund etxgwld at cbe.ericsson.se
Tue May 28 10:14:48 EDT 2002

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

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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