Author: leonid
Date: 15:02:23 09/20/99
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On September 20, 1999 at 15:22:16, KarinsDad wrote: >On September 20, 1999 at 14:47:49, leonid wrote: > >[snip] >> >>My engin: 6 plys 0.22 sec. 8 plys 18 sec. 10 plys 14min. and 54 sec. >> >>Rebel 10: 2.6 sec 40 sec 12min. and 8 sec. >> >>If my "branching factor" between 6 plys and 8 is 82, for Rebel it is only >>15.3. This is how Rebel take over on the 10 ply. Number of positions per >>second are almost indentical but my are higher. Average number of nodes >>per ply is 36. >> > >Well, it appears that the branching factor for your program (2 ply) from ply 8 >to 10 is 49.7 whereas Rebel's is 18.2. So, your branching factor from ply 8 to >ply 10 is dropping relative to your branching factor from ply 6 to ply 8. Rebel >on the other hand has a slightly increasing branching factor from ply 8 to ply >10 relative to it's ply 6 to ply 8. > >So, whatever the problem is, it does appear to be based on the position (i.e. >some set of positions give you a much greater branching factor relative to Rebel >than another set 2 ply higher). Since pure Alpha Beta should have a ballpark of >a 2 ply branching factor of 36 for the position you are examining, I would guess >that you have a mistake somewhere in that portion of the algorithm. Maybe >assigning Beta to a bound when you should assign Alpha or something along those >lines. > >KarinsDad :) Will be nice if you could explain me the last sentence of your response. And also what is the "Ballpark"? Thanks, Leonid.
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