Author: Odd Gunnar Malin
Date: 03:52:45 11/28/03
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On November 28, 2003 at 06:44:48, Tord Romstad wrote: >On November 28, 2003 at 06:12:43, Odd Gunnar Malin wrote: > >>On November 28, 2003 at 05:00:49, martin fierz wrote: >>> >>>how much foreign code is allowed? >> >>None. > >My engine is completely different from Crafty in almost every possible >way. I don't have a single bitboard in my code. I do lots of >eval-based extensions, reductions and forward pruning. My qsearch is >quite big and contains many checks and other non-capturing moves. >Qsearch is hashed. My eval is used to locate mate threats, hanging >pieces, forks, pinned or overloaded pieces and similar tactical motifs. >My search algorithm is MTD(f) rather than PVS. In short, my whole >approach to chess programming is radically different to Bob Hyatt's, >and there is very little in Crafty's source code which has any interest >to me. > >But still, my 64-bit random number generator is copied directly from >Crafty's source code. Does this make my engine a clone? If you or >somebody else thinks the answer is "yes", I will consider replacing >the random number code in my next version, even though it will force >my users to download the opening book again. > >Tord If you took it as it is without testing, yes I would think so. If you took his idea and learned it from Knuth's book, I guess it would be right. I did allmost the same but I stoped because I didn't have the source of his magic numbers or any other magic number. I added instead the random generator two pages later in Knuth's book. But I have to admit that I have several random generators masked out in my code that I put in to check when I have debugged the hash for some days.
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