Author: Uri Blass
Date: 02:14:07 03/28/04
Go up one level in this thread
On March 27, 2004 at 22:38:40, Odd Gunnar Malin wrote: >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 I assume based on reports that I read Ruffian performs worse with pondering on that it does something wrong so I will be surprised if it does something that make sense instead of what peter describes. Uri
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