Author: Howard Exner
Date: 09:12:03 03/09/00
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On March 09, 2000 at 12:00:40, Brian Richardson wrote: >On March 08, 2000 at 05:11:11, Howard Exner wrote: > >>Test your chess engine if it handles this repition theme correctly. To do this >>set up the position below and play the white side yourself. Do not enter the >>winning move Kh5 but instead play the blunder Kg5. Now let your program play the >>black side at say game/15. It will of course play Kd5+ which forces perpetual >>check. After it does that try to trick the program and reply Kg4. >>Now the test - does your program play the correct Qd1+ or does it blunder and >>mistakenly repeat the position with Qe4+, assuming that the opponent will >>blunder again with Kg5? Rebel Century failed this test and assumed white would >>play again the poor move Kg5. >>Why would a program do this? Do other programs fall into this trap of assuming >>a repetition of moves even when not forced? >> >>[D]8/4k3/7Q/8/4q1KP/6P1/8/8 w - - > >OK, the 3-rep question is an interesting one, but in this position, black is two >pawns down--why wouldn't a draw be the "right" thing--so how could Qe4+ be a >blunder? (my own chess is relatively poor, so please excuse my missing >something obvious). > >Thanks. As stated in the original the second time around Qe4 is a blunder because Qd1 instead is a sure draw. If Qe4 then white wins with Kh5. This is a position taken from the book "The Secrets of Chess Training" by Mark Dvoretsky.
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