Author: Odd Gunnar Malin
Date: 19:38:40 03/27/04
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On March 27, 2004 at 21:13:53, Peter Berger wrote: >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 >:). Still a bit strange since if it runs as uci there isn't an otion to show a pv like you describe so it will/should be quiet if it don't use the ponder move. And running as WB CP have problem showing a pv that start with the players move so I guess you look at the pv in the log-window. >Yes, it will change the first move; else I would obviously make no sense at >all. Well playing the second move from a pv-line doesn't make sense neither, maybe it does some advanced pondering with switching pondermove if current pondermove lower the score for the player too much eg. is a bad move. Odd Gunnar
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