Author: Peter Berger
Date: 18:13:53 03/27/04
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On March 27, 2004 at 21:07:11, Odd Gunnar Malin wrote: >On March 27, 2004 at 19:51:33, Peter Berger wrote: > >>For about a month I have waited for someone to bring this up now. Occasionally I >>thought I should post about it, but then I thought someone else (a much more >>knowledgeable guy at best) would do it anyway sooner or later. I decided to just >>do it now and not bother to do it very well at all. >> >>This is about Ruffian 2.1.0 I bought at Lokasoft's ( it probably applies to >>other Ruffian 2 versions too). >> >>Now how does Ruffian 2 ponder? >> >>Usually programs assume the second move of the PV as being played, and then >>think as if it were their own move in the meantime. If the expected move gets >>played indeed, some (loads of at times ) time has been saved - else the time is >>lost (despite some potentially useful entries in the hashtable). >> >>Another approach ( inferior) is to just think as if you were the opponent during >>ponder and rely on savings from the hashtable you achieved -you get some useful >>entries in the hashtable anyway, but this can't be an optimal strategy IMHO. >> >>Now Ruffian _does_ think as if it were the opponent during pondering, too, but >>in case the expected move is played it does the same as the usual strategy does >>during pondering but one ply further. The second move in the PV is the move to >>be played in case time has already run out, else some time has been saved of >>course. Again, if another move has been played, the time is lost. >> > >If the engine is running as wb engine there is two methods to show the pv-line: > >1. Send a hint-move for your opponent move and then send the pv in normal way >eg. starting with your next move. >2. Put the hintmove in front of the pv for each time you send the pv. > >You are sure it isn't this second method you observe, eg. do it ever change the >first move in the pv. > Feeling more positive now as I at least thought about this obvious explanation :). Yes, it will change the first move; else I would obviously make no sense at all. Daylight saving - it's 4 AM now - time for bed :). Cheers, Peter
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