Author: Walter Faxon
Date: 13:16:22 12/22/05
Go up one level in this thread
On December 22, 2005 at 16:03:18, Stuart Cracraft wrote: >On December 21, 2005 at 10:49:43, Joshua Shriver wrote: > >>Look into 0x88: >> >>http://www.cis.uab.edu/info/faculty/hyatt/boardrep.html >> >>On December 21, 2005 at 09:04:17, David Rasmussen wrote: >> >>>I am most familiar with bitboards, but now I have to make a chess program with >>>an old C compiler (gcc 2.6.0) that doesn't support "long long". I could typedef >>>a struct with two 32-bit ints to be a bitboard and then implement the logical >>>operators in functions, but I want to consider other options. >>> >>>What would be a good representation for a "competitive" chess program (not a toy >>>project), on a platform with little memory and slow performance (C is compiled >>>into a interpreted language in this case). >>> >>>/David > > >Personally I always feel guilty thinking or doing anything other than >bitboard, at least as a goal, if not reality. > >The reason is that 64-bit chips and 64-bit OS ultimately being common >are the reason to make your program future-oriented. > >Bitboards, for example, as implemented by Crafty or GNU Chess 5, are really >artistic. Knowledge representation is very elegant. Crafty is immensely >stronger. I am not comparing that. > >They make encoding knowledge more-straightforward. > >I would advocate bitboard for everybody. Make your program 0x88 or >non-bitboard for moves and use bitboards for evaluation and then >rewrite your move generator in the future. You don't have to go bitboard >for everything at once. > >This way your learning curve isn't as steep so suddenly. > >Stuart Hi, Stuart. My understanding is that GNU chess v5 has a reputation of being weaker than v4. Is this true and if so is it just a matter of v4 having been tuned better? What's the status of GNU chess? Are you working or planning to work on it? Lots of ideas from other open-source engines are available now, esp. GNU-licensed Fruit and co. -Walter
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