[Retros] Two little SPG-challenges

Anders&Margareta uddgren at xpress.se
Wed Nov 10 12:59:22 EST 2004


For the record: Natch on P4 3 GHz 512 MB
A: 1 mn 18.13 s
B: 10 mn 11.87 s
not a great diff
/anders uddgren


----- Original Message -----
From: "Mario Richter" <mri_two at t-online.de>
To: <retros at janko.at>
Sent: Wednesday, November 10, 2004 2:39 PM
Subject: [Retros] Two little SPG-challenges



> Dear retro-friends,

>

> maybe I can use the current low traffic on this

> mailing-list to present to you two little challenges.

>

> While playing a little bit with the "At-Home-Proofgame"-

> theme, I found the following to positions:

>

> Position A:

>

>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

> | R | S | . | | K | B | S | R | (13 + 14)

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

>

> rnb1kbnr/pp1ppppp/8/8/8/8/PPPP1PPP/RN2KBNR

>

> SPG in 7.5 moves

>

>

> Position B:

>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

> | R | | B | Q | K | B | . | | (12 + 13)

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

>

> rnbqk1nr/pppppp2/8/8/8/8/PPPPPPP1/R1BQKB2

>

> SPG in 7.0 moves

>

> (If these problems are already published or

> otherwise anticipated, I would be grateful,

> if somebody could provide author and source.)

>

>

> First challenge:

>

> Can you do better than 'natch' on a 350MHz-PII-machine?

>

> (natch - with 128MB hash-table - solves

> - Pos A in 3min 50s

> - Pos B in 34min 04s)

>

>

> If some of you try to solve the two problems,

> I would be grateful if you can send me your

> solving times.

>

>

> Second challenge:

>

> Both proof games contain a rather paradoxical

> element (at least I consider them that way).

>

> Can you construct longer proof games (not

> necessarily of the "At-Home"-type), which show

> the same element?

>

>

> greetings

> mario

>

>

>

>

> _______________________________________________

> Retros mailing list

> Retros at janko.at

> http://www.pairlist.net/mailman/listinfo/retros





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