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MatPlus.Net Forum Internet and Computing crazy queen
 
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(1) Posted by Marek Kwiatkowski [Saturday, Feb 13, 2010 01:58]; edited by Marek Kwiatkowski [10-02-13]

crazy queen


Probably all chess engines contain error (?) - “crazy queen“. It is important information for study composers.
Now it is known, why Stockfish can’t solve the 5th example of my IQ test.

The following 4 positions will not solve any UCI (or chess) engine.
All: black to move and win.

(= 5+5 )

1...Qxh7

(= 5+7 )

1...Qxa6 (Qxb5, Qxd4)

(= 5+4 )

1...Qxc3

(= 4+4 )

1...Kg5 [now or later]

There is a wrong high score, and the queen makes a sequence of moves without any benefit.
 
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(2) Posted by Marek Kwiatkowski [Saturday, Feb 13, 2010 22:20]

I joined all my work into the article: "Crazy queen" and other problems with chess engines.
http://free.of.pl/c/ccintorun/g/crazy%20queen.pdf
I see that nobody uses computer to create chess compositions.
 
 
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(3) Posted by Siegfried Hornecker [Sunday, Feb 14, 2010 00:43]

Thanks for the article and bug report, but I really don't know what one should reply. You're right so everyone would agree.
 
   
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(4) Posted by Marek Kwiatkowski [Sunday, Feb 14, 2010 01:45]

Thanks for thanks!
 
   
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(5) Posted by Marek Kwiatkowski [Saturday, Feb 27, 2010 11:48]; edited by Marek Kwiatkowski [10-03-05]

Unfortunately, I found two examples of „crazy rook” too.

(= 4+5 )

1...Rxg5 wins

(= 5+5 )

1...Kf7 wins

Be aware, because it concerns studies, mainly.
 
 
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MatPlus.Net Forum Internet and Computing crazy queen