Author: Laurence Chen
Date: 11:33:39 12/29/00
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On December 29, 2000 at 12:00:41, Uri Blass wrote: >This position is similiar to the position that crafty had no problem to solve > >[D]R7/8/6k1/4n3/5p2/5P2/5r1p/7K b - - 0 1 > >The test is to avoid Nxf3 that is leading to a draw. >Another test is to see the draw after Nxf3. > >I am interested to know if there is a program that can see the draw after Nxf3 >by search. >I am not interested in the result of littlegoliath because I know that this >program can evaluate as draws positions that are not draws because it assumes >that there is a perpetual check if it cannot prove that there is no perpetual >check. > > > >Did somebody try to do a program not for playing games but only to find if there >is a perpetual check? >The program can use selective search for white when it considers only checks for >white and replies for check for black. > >It needs to evaluate only positions when white cannot do a check or positions >when there is a repetition. > >It can evaluate repetitions as a draw and stalemates as a draw. > >I believe that a program like this can prove that there is a perpetual check >because the number of relevant positions that it needs is small enough to search >to the end of the checks. > >Did somebody try to build this program and how much time does it need to find >the pereptual check in the position after Nxf3? After the bad Nxf3, White's King is in a stalemate position. Therefore, White can give up his rook for the stalemate. It is a perpetual alright, but it is more interesting to see if any chess engine can find the rook sacrifice for stalemate in its evaluation. Can any chess engine find that? Regards, Laurence
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