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Chess / Skak




Most of the items here are from 1995 or older - before the internet was used by everyone.
But now I have put some of this old stuff out here.
Although it is old stuff, it might still interest someone.

Right now this page is a mix of english and danish (and german).

It should be divided into an english part and a danish part later.

A few of the links below are not ready yet.


 

Dabbaba

Her er et skakprogram, som jeg har lavet fra 1995 til 1998.
Dabbaba kan slå 4 ud af 5 klubspillere.

Dabbaba kan hentes her.
Udpak filerne, klik på DABBABA.EXE og du er kørende!


Dabbaba kan også spille nogle andre varianter af skak (så klik i stedet på VDABBABA.EXE).

Læs en stor artikel om Dabbaba her. (german/tysk/deutsch)

Der kan du læse hvordan Dabbaba kan gøre nogle specielle ting
- som fx at finde en mat i 8 træk på 0,16 sekund på min 2,6 GHz PC i denne stilling.
Selv om de første træk er meget overraskende!

1.Df7+! Kxf7 2.gxh8S+! Ke8 3.Sg7+ Kd8 4.Sf7+ Kc7
5.Se8+ Kc6 6.Se5+ Kb5 7.Sc7 Kxa5 8.Sc4+ og sorts konge er mat på a5!



Læs om knap 40 interessante teststillinger vedr. "utilstrækkeligt materiale"
her.
Read how the chessprogram Genius fails in a certain position.

Læs en meget tidlig beskrivelse af Dabbaba fra januar 1996 her.
Læs om ændringerne fra januar 1996 til november 1998
her.

Hvordan er Dabbaba programmeret:
Se diagram.
Se de ca. 7.000 programlinier skrevet i "C".

Læs om nogle spil Dabbaba har spillet pr. email mod Paulowich og Benjamin.

Læs evt. mere her: http://www.chessvariants.com/programs.dir/dabbaba.html

Dabbaba kører i et DOS-vindue med simpel grafik og uden brug af mus :o(


Men har man to PC'er, kan man forbinde dem med auto232.
Dabbaba på den ene, og på den anden et program (som der findes flere af på nettet) med et grafisk skak-interface.


 

The Nielsen Ratingtest.

From 1986 to 1991 I constructed a test based on more than 100 chess positions.
The goal was to be able to estimate the rating of the programs tested.
And use the test for improving the development of chess programs.

Many of the positions are too easy for the computers of today.

Perhaps someone makes a better test in the future...


My
article about the test in ICCA JOURNAL i 1991.
This is my original article.
The version in ICCA JOURNAL was edited very much and almost destroyed in my opinion.

The test:
Scheme for results and page 1.
Page 2 and 3.
Page 4 and 5.
Page 6 and 7.
Page 8 and 9.
Page 10 and 11.
Startvalue and the points (prototype 4 - the final version of the test) used for each position.
Read here how the points were
adjusted in the test.

The results for a number of programs - page 1 and page 2.

Some
notes about what could be wrong in such a test.

Although this test is very old, I have found some notes about it on the internet here and here.



Brutalis

Brutalis er et andet skakprogram, jeg har programmeret.

Hent programmet her.
Udpak filerne, klik på BRUTALIS.EXE og du er kørende!

Det kan løse en speciel type skakopgaver, der kaldes hjælpematter (normalt at sort hjælper hvid med at sætte mat).
Og det har forskellige specielle options til konstruktion af hjælpematter med nogle særlige løsningsforløb/fordringer.

Læs om eksempler på hjælpematter og brugen af Brutalis her.

Se hvordan Brutalis er programmeret i sproget C her.

I have constructed some tasks from the opening position.
Brutalis may help in constructing and solving such tasks.
You can see them
HERE.


En stilling løst med retrograd analyse

Løs en bestemt skakopgave - et bondeslutspil - ved retrograd analyse.
Hent programmet her.
Det skal køres i den gamle QBASIC.
Der er mere information i selve programmet.


Computer-Chess

In february 1993 (Baby) Deep Blue was in Copenhagen.
Deep Blue met GM Bent Larsen and other danish top players.
I had the pleasure to prepare the danish players by making 50 A4-pages,
that was copied to all the players.

Kasparov came the day before and played a little against Deep Blue.



After this exciting week programmer Joe Hoane & wife visited my house in Jutland
the following week-end.
I feared Deep Blue would play in a certain way against humans, but as expected it didn't.
I gave my advise of this kind of play to the Deep Blue Team.

You can read it HERE.... later..... See most of it below...


I have 4 hours video and many photos from the Deep Blue event.

Deep Blue ran (via Larry Kaufman) my computerratingtest (ca. 1988).

---------------------

Computers could be programmed to play especially good against humans.

As far as I know it has never been done.
It can be seen in this article here (
part1, part2, part3), that I wrote for the austrian magazine MODUL in 1988.
It is in german - not english :o(

The article also shows some other spektacular things about computerchess...

Computers could in short play better against humans in this way:
1) Among almost equal good moves, choose those that lead to open and tactical positions instead of closed and positional positions.
2) Among almost equal good moves, choose those with traps that may lead your opponent to fail. If you are in a lost position anyway, you may even choose a bad move if it gives your opponent a risk to fail. This also applies to a draw position, if the bad move still can hold the draw. See these 3 positions from my ratingtest (
pos. 39, 40 and 41) that I used in the above mentioned article.
3) Used the opponents time to prepare an immediate answer to 5 or 6 of his best moves. This means the program will only search one halfmove less ahead and a little weaker, but it will stress the human, make him tired and give him no time to ponder while the computer calculates its move.


Other variants of chess


Torben Osted and I have invented some new variants of chess, and you can read about them on the net here:

Twiknight chess.. : http://www.geocities.com/Colosseum/Field/2900/twik.htm

Transporter chess:
http://www.geocities.com/Colosseum/Field/2900/trasp.htm

Darkness chess....:
http://www.geocities.com/Colosseum/Field/2900/dark.htm (is mentioned in Wikipedia)

If you want to play some variants of chess, you could try THESE simple ones...


In progressive chess white makes 1 move, black 2 moves, white 3 moves etc.
This variant is played much in Italy.
In 1995 Italy challenged the rest of the world in a big match pr. mail.
My games from this match can be seen
HERE.




Nogle af mine egne skakpartier

I 1978 blev jeg klubmester i Viby skakklub.
Jeg valgte at bringe
DENNE partislutning i klubbladet.

Jeg har kun prøvet at spille et parti blindt (med ryggen til) 6-7 gange.
Et af disse partier kunne ses i Silkeborg skakklubs klubblad (
start og slut).

Mit parti mod Edmund Sjøgren, da jeg blev klubmester i Nørre Snede i 1973.
Edmund er Kim Sjøgrens far.
En af dem lærte mig at spille skak; sikkert Kim - men jeg husker det ikke.

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Nogle artikler for Skakbladet og for klubblade

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