Author: John Coffey
Date: 14:23:23 10/05/98
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On October 05, 1998 at 17:10:07, Cristian Zaslo wrote: >Hi everybody! >One day I made a comparison between some ZX Spectrum chess programs (Colossus >4.0, Superchess 3.5) and some medium - level PC programs (K-Chess, Now, Gnu >Chess) and found that these ZX programs use a pretty strange searching algorithm >(for me) , as follows : > 1. It seems to me that entire searching tree is built round the PV which is >often longer than current depth and it may contain “positional moves” (no >captures or checks) everywhere including in the Q-search part. > 2. The other branches are cut-of very quickly, sometimes just from the root, >and so, can overlook. good moves. > >I now that many programs (mine too) grow branches this way: > (Depth + Extension) + Q-Search >I’d like to now a little bit more about the search-engine (cut-off techniques) >used by these “old fashioned programs” and if this approach still (no)works on >any PC programs. > >Much obliged to you, >Cristian Zaslo I had a copy of Colossus 4 for the ZX-Spectrum. I dont' remember being very impressed wiht it, but it was a pretty slow computer. No doubt the search techniques were that way because of the slowness of the machine. From where did you get the documentation on the code? John Coffey
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