[Retros] Massacre K+K proof games once again

[Norbert Geissler]

Hello Mario,

Answers to your questions:
1) You are right, at that time we had calculated 33 and 34 plies
    But two years later even 35 plies were calculated.
    Result: no sound K+K proof game ...
2) I didn't publish anything, this was always done by Gerd.
     So it's up to him to answer this question.
3) As far as I remember:
    33 plies:       2 hours
    34 plies:       4 weeks
    35 plies:       9 months
    Of course, for 35 plies we had better hardware at hand ...

Hope that's what you wanted to know.

All the best,
    Norbert


Mario Richter wrote:


>Dear retro friends,

>

>in the award for the retros section of the year 1994,

>published in "Die Schwalbe", october 2004, Gerd Wilts

>and Norbert Geissler received a special award

>(congratulations!) for the following problem:

>(s.

>www.dieschwalbe.de/unserezeitschrift/archiv/2004_209/2004_209.html#retro)

>

>White: Kc2

>Black: Kg8

>

>PG 17.0, Black captured on move 2

>

>Spezialpreis: Nr. 8491 von Gerd Wilts & Norbert Geissler

>

>1.e4 d5 2.exd5 Qxd5 3.Qh5 Qxa2 4.Qxh7 Qxb2

>5.Rxa7 g5! 6.Qxf7+ Kxf7 7.Rxb7 Rxh2 8.Rxc7 Rxg2

>9.Rxc8 Rxf2 10.Rxb8 Rxd2 11.Kxd2 Qxc2 12.Kxc2 Rxb8

>13.Bg5 Rxb1 14.Bxe7 Rxf1 15.Bxf8 Rg1 16.Rxg1 Kxf8

>17.Rxg8+ Kxg8

>

>The jugde (Werner Keym) wrote:

>

>"Die Autoren haben herausgefunden, dass es keine exakte

>Beweispartie mit nur 2 Steinen gibt und mittels einer

>Zusatzbedingung die erste dargestellt..."

>

>"The authors detected that there is no exact two-men proof

>game [mri: aka K+K massacre proof game], and realized the

>first exact one with an additional constraint ..."

>[mri: black captured on move 2].

>

>

>My questions are:

>

>(1) The correct statement with respect to the K+K proof games

>    should be:

>    ..."The authors detected that there is no exact two-men

>    proof game *with 33 or 34 plies*".

>    Right?

>

>(2) Have the methods and results of that research been

>    published somewhere?

>    I was only able to find the following article by Torsten

>    Linss, which refers to the research of Gerd and Norbert:

>    www.math.tu-dresden.de/~torsten/problem/coco_txt.html

>    (and an older one by Karlheinz Bachmann in "Die Schwalbe",

>    Nr.141, Juni 1993).

>

>(3) With today's (home) computers it is possible to do the

>    complete search for the 33-plies-K+K-proof games in

>    less than 2 seconds, and that for 34 plies in approx.

>    10 minutes.

>    It would be nice to compare that times to those needed

>    11 years ago. (Especially to Gerd+Norbert, if they

>    are reading this) Is any info about that still available?

>

>Thanks for any clarification,

>

>  mario

>

>

>

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