Author: Robert Hyatt
Date: 16:30:07 08/07/03
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On August 07, 2003 at 19:02:34, Rick Bischoff wrote: >Hi everyone, > >I am reading up on the PVS and had a question regarding different code found at >different places... At this webiste: >http://www.xs4all.nl/~verhelst/chess/search.html#principal the value of "alpha" >is never changed inside the loop; the best score found so far is in a seperate >variable. But, in Bruce Moreland's webiste: >http://www.seanet.com/~brucemo/topics/pvs.htm, alpha is being updated instead. > >This *has* to have an impact as both functions mentioned above use alpha for the >window. Which is the correct way? > >Thanks, >Rick Done correctly, they are the same. If you don't modify the alpha value, but use another variable, then you pass _that_ value as beta to the next search ply. It is simpler to just modify alpha each time, which makes the code more understandable, IMHO.
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