Author: Jesper Antonsson
Date: 17:32:13 05/05/01
Go up one level in this thread
On May 05, 2001 at 11:28:33, Ralf Elvsén wrote: >On May 05, 2001 at 11:00:25, Robert Hyatt wrote: >>If you believe that another ply gives a more accurate answer, which I do, >>then the rate of change should be obvious. If you change your mind, you >>find a better move due to the deeper depth. > >Of course, I should have explained myself better: the quantitative relation >is not known, i.e. how does the increase in playing strength relate to >this change-your-mind-rate. This is only guesswork as far as I know. I would guess that the change-your-mind-rate correlates well with playing strength. (Lower rate is better.) >If another ply is better, you must change your mind sometimes. >That the reverse is true isn't clear to me: change your mind to a >move that doesn't change the outcome of the game (on average). I don't >like this unclear link. We may have diminishing return between (say) >ply 15 - 20 and yet have a constant rate of new best-moves, or (more likely) >it may decrease but much slower. Well, the search could oscillate between moves if they are equally good (all lead to draw or all lead to mate in 50 or whatever), but that should be relatively rare. Also, the search could temporarily abandon a move/PV that is objectively best, because it originally chose that move without the depth necessary to understand *why* it was best. However, if you use many positions (or play a lot of games), another ply will give better moves most of the time (and a lower change-rate all of the time). Jesper
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