Author: Bruce Moreland
Date: 18:33:31 10/24/99
Go up one level in this thread
On October 24, 1999 at 16:02:34, Frank Schneider wrote: >On October 24, 1999 at 10:08:45, Robert Hyatt wrote: > >>On October 24, 1999 at 05:59:40, Frank Schneider wrote: >> >>> >>>I haven't tried the 'strings lapetite.exe', but I believe you that there are >>>lots of strings that were just translated. I agree that is strong evidence >>>that lapetite's I/O is based on Crafty. But is there any evidence that the >>>engine is still a crafty clone? >>> >>>Copying an engine is, from my point of view, much worse than reusing the >>>I/O stuff and structure of the userinterface. >>> >> >>Run the second test I mentioned: start "La Petite" under a debugger, and >>look for the area where all the 64 bit masks are in memory. You will find >>patterns like 80000000 00000000, 40000000 00000000, 20000000 00000000, etc. >>then look for the rotated masks which are like the above, but in a different >>order (64 bits, 1 bit set). Then compare to crafty.exe. Look at data.c to >>find the pre-initialized scoring array patterns. See if you can find 'em in >>La Petite. :) >> >>etc. >I don't have La Petite. > >But I have very similar bit masks in Gromit (only 16 bit, because Gromit >does not use bitboards) and I wonder how to write a bitboard-base program >without such bit masks. Is there anything special about the order of masks >in Crafty that is unlikely to be invented independently by others? > >Do other bit board based programs use such masks? How do they look in >Inmichess? Insomniac (if it uses bit boards)? > >I agree that it is something different if LaPetite uses the same scoring arrays. >Everyone uses them, but finding lots of identical scores would be surprising. > > >I'd really like to see a statement here, where G. Mueller gives her point >of view. > Bob is implying that this thing uses the same piece-square values, or at least that they are compiled in. bruce
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.