[Retros] Massacre K+K proof games once again

Mario Richter mri_two at t-online.de
Sat Oct 8 08:46:16 EDT 2005

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:

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*".

(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:
(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,


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