Author: John Merlino
Date: 17:14:50 04/13/02
Go up one level in this thread
On April 13, 2002 at 15:59:39, leonid wrote: >On April 13, 2002 at 15:15:07, John Merlino wrote: > >>On April 13, 2002 at 14:49:12, leonid wrote: >> >>>On April 13, 2002 at 14:36:31, John Merlino wrote: >>> >>>>On April 13, 2002 at 07:49:31, leonid wrote: >>>> >>>>>Hi! >>>>> >>>>>Recently I found that for many programs selective search for mate is pretty >>>>>different. At least, in few recent mate positions my default selective was >>>>>useless. I am curious to see how many other programs can solve this position by >>>>>selective. Mine was useless on this even if it look like to be ideal for >>>>>selective. Position in itself is not deep, or very difficult. >>>>> >>>>>[D]1qbqkbq1/QBRNBNQ1/1QnQpQn1/1q1RQ1p1/3rn3/2Q2Q2/Q6K/1r4r1 w - - >>>>> >>>>>Please indicate your result, never mind your way of solving this mate. >>>>> >>>>>Thanks, >>>>>Leonid. >>>> >>>>I don't know if it's the shortest mate, but it took Chessmaster a long time (on >>>>a PIII-733) to find Mate in 10 anyway (with some HUGE evals along the way), as >>>>the first seven moves are all non-checking moves: >>> >>> >>>So, actually Chessmaster took this position by selective and not that far from >>>shortest one. Pretty good! >>> >>>This position is mate in 9 moves. >>> >>>Cheers, >>>Leonid. >> >>I'm trying Chessmaster's Solve for Mate mode. It finished depth 8 in just a few >>minutes, but is taking quite a long time to finish depth 9. It still hasn't >>announced mate in 9, and it has been going for almost 40 minutes on my PIII-733 >>(over five minutes longer than it took to announce Mate in 10 via selective >>search). > > >What is exactly "Mate mode"? Is this forced mate, in other words search that >look for every possible mate and miss no mates? And how you indicated before to >your program to look for mate? > >I remember Chessmater 4000 as very good mate solver but I don't remember exactly >if its mate look like to be forced mate, or selective, or just both in sequence. >Few solutions that were presented here were quick and were found on Chessmater >8000. I am almost sure that they were found by selective search. Correct. Unless I say otherwise in the post, Chessmaster will be using the standard personality with the typical selective search to generate the analysis. But, Chessmaster also has a "Solve for Mate" feature which basically sets extensions to zero. So, instead of the depth being reported as 4/9 (for example), the depth will be reported as 9/9. You just tell the program the maximum number of moves you want it to look ahead, and it will report a mate as soon as it finds one. jm
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