[Retros] Probleemblad 1-2007 (jan-mar 2007)

[Rol, Guus]

My composition in PB is an illustration of the appreciation of
"available game state information". Two well-known retractor-problems by
R.Kofman (also -1 and #3) use contradicting principles on the treatment
of retraction information. I have combined elements from both of them in
2 of the 4 variants of my problem to demonstrate the impact of
rule-consistency. In my view one of Kofman's originals is a misdirected
interpretation of the mutex (mutually exclusive castling) convention.
Which in turn shown that the mutex convention is not just redundant but
also dangerous when it causes confusion amongst retro-composers.

Guus Rol.



> -----Oorspronkelijk bericht-----

> Van: retros-bounces at janko.at [mailto:retros-bounces at janko.at] 

> Namens Joost de Heer

> Verzonden: dinsdag 3 april 2007 10:50

> Aan: The Retrograde Analysis Mailing List

> Onderwerp: [Retros] Probleemblad 1-2007 (jan-mar 2007)

> 

> 

> Due to too little time for the Probleemblad editorial staff, 

> Probleemblad will have four issues per year, instead of six.

> 

> R320 - Guus Rol

> 4k2r/2pb1p1r/Pp2pBpp/2P3RP/2p5/8/5PPP/R3K3

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

> |   | . |   | . |*K | . |   |*R |

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

> | . |   |*P |*B | . |*P | . |*R |

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

> | P |*P |   | . |*P | B |*P |*P |

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

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

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

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

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

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

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

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

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

> | R |   | . |   | K |   | . |   |

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

>   10 + 11

> -1 & #3

> (b) wRg5->d4

> (c)=(b)+'000' (not the move but the replacement of two 

> pieces!) (d)=(c)+bPh6->a7

> 

> R321 - Klaus Wenda

> 7q/3P2P1/8/P7/1p4K1/kp6/Pp4PP/2B4s

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

> | . |   | B |   | . |   | . |*S |

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

>   8 + 6

> -6 & #1, Proca retractor, Anticirce

> 

> R322 - Dirk Borst rs4rk/ppp1spp1/3bp3/5b2/7p/6Pq/PPPPPP1P/RSBQ1RK1

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

> |*R |*S |   | . |   | . |*R |*K |

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

> |*P |*P |*P |   |*S |*P |*P |   |

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

> |   | . |   |*B |*P | . |   | . |

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

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

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

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

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

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

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

> | P | P | P | P | P | P |   | P |

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

> | R | S | B | Q | . | R | K |   |

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

>   14 + 15

> (a) Proofgame in 11.0

> (b) Proofgame in 11.5 _______________________________________________

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