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How to get futility pruning to work?
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Robert Purves



Joined: 15 Feb 2010
Posts: 155
Location: New Zealand
PostPost subject: Re: How to get futility pruning to work?    Posted: Thu Mar 08, 2012 8:55 am Reply to topic Reply with quote
Ferdy wrote:
I am trying to implement some bitboard routines in my engine, and have difficulty figuring out if ttd is a good measure for improvement, though I eventually test it in real games. What specific position should one choose for doing some initial test to measure ttd?

One position is no good. Some or all of the PV will likely be different with and without pruning, and the time to a particular depth is on occasion actually increased by pruning.
What I did was to measure the time for all 300 WAC.epd problems at fixed depth, to get a broader picture. The number of correct solutions was not much affected by pruning.
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Subject Author Date/Time
How to get futility pruning to work? Robert Purves Mon Mar 05, 2012 5:16 am
      Re: How to get futility pruning to work? Ferdinand Mosca Mon Mar 05, 2012 6:24 am
      Re: How to get futility pruning to work? Don Dailey Mon Mar 05, 2012 1:52 pm
            Re: How to get futility pruning to work? Robert Purves Mon Mar 05, 2012 10:16 pm
                  Re: How to get futility pruning to work? Don Dailey Mon Mar 05, 2012 10:42 pm
                        Re: How to get futility pruning to work? Robert Purves Wed Mar 07, 2012 11:40 pm
                              Re: How to get futility pruning to work? Ferdinand Mosca Thu Mar 08, 2012 4:30 am
                                    Re: How to get futility pruning to work? Robert Purves Thu Mar 08, 2012 8:55 am
                        Re: How to get futility pruning to work? Ferdinand Mosca Thu Mar 08, 2012 4:36 am
            Re: How to get futility pruning to work? Vincent Diepeveen Thu Mar 08, 2012 7:04 am
                  Re: How to get futility pruning to work? Robert Purves Sat Mar 10, 2012 12:38 am
                        Re: How to get futility pruning to work? Vincent Diepeveen Sun Mar 11, 2012 4:14 am
                              Re: How to get futility pruning to work? Vincent Diepeveen Sun Mar 11, 2012 4:41 am
                        Re: How to get futility pruning to work? Vincent Diepeveen Sun Mar 11, 2012 5:01 pm
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