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stand pat or side to move bonus
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Sune Fischer



Joined: 17 Sep 2009
Posts: 109
PostPost subject: Re: stand pat or side to move bonus    Posted: Sat Mar 24, 2012 10:38 am Reply to topic Reply with quote
lkaufman wrote:
In at least 99% of chess positions, it's better to be on move than not. Therefore all strong programs take this into consideration when evaluating positions or making decisions. There appear to be three possibilities:

A. Simply give the side to move a bonus when doing an evaluation, which can either be a constant or may depend on something else.
B. When reaching quies, if you are below beta but within for example 10 centipawns of beta allow the cutoff.
C. Do both of the above.

What are the pros and cons of the three methods? We currently use method A, but I notice that some strong programs appear to use B or C. Are there any other possibilities in use for handling this issue?


Frenzee uses method A. Originally I used it to make the aspiration a bit more stable. Instead of having scores alternate between 0 and +0,30 at every iteration in the opening, by setting tempo to the mean 0,15 it stabilized around +0,15. This allowed me to tighten the aspiration window a tad. Also given two leaf positions with equal score (not counting a tempo bonus) you'd probably prefer the position with you in the move. So it seems a small bonus is justified.

If you're asking for a heuristic to make the bonus dynamic, I have none... Maybe if we had a measure of the amount of the volatility/tension/complexity of the position we could base it on that...
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Subject Author Date/Time
stand pat or side to move bonus Larry Kaufman Thu Mar 22, 2012 9:15 pm
      Re: stand pat or side to move bonus Sam Hamilton Thu Mar 22, 2012 10:49 pm
      Re: stand pat or side to move bonus Daniel Shawul Thu Mar 22, 2012 11:27 pm
            Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 12:40 am
                  Re: stand pat or side to move bonus Daniel Shawul Fri Mar 23, 2012 1:27 am
                        Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 2:06 am
                              Re: stand pat or side to move bonus Daniel Shawul Fri Mar 23, 2012 3:07 am
                                    Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 3:26 am
                                          Re: stand pat or side to move bonus Richard Vida Fri Mar 23, 2012 2:07 pm
                                                Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 2:42 pm
                                                      Re: stand pat or side to move bonus Richard Vida Sat Mar 24, 2012 9:59 am
                                                            Re: stand pat or side to move bonus Larry Kaufman Sat Mar 24, 2012 2:44 pm
                                                                  Re: stand pat or side to move bonus Richard Vida Sun Mar 25, 2012 1:51 pm
                                                                        Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 2:44 pm
                                                                              Re: stand pat or side to move bonus Richard Vida Sun Mar 25, 2012 3:21 pm
                                                                                    Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 3:40 pm
                                                Re: stand pat or side to move bonus Marek Kwiatkowski Fri Mar 23, 2012 2:46 pm
                              Re: stand pat or side to move bonus Richard Vida Fri Mar 23, 2012 2:01 pm
      Re: stand pat or side to move bonus Robert Hyatt Fri Mar 23, 2012 2:38 pm
            Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 2:47 pm
                  Re: stand pat or side to move bonus Uri Blass Fri Mar 23, 2012 3:39 pm
                        Re: stand pat or side to move bonus Larry Kaufman Fri Mar 23, 2012 3:45 pm
                              Re: stand pat or side to move bonus Robert Hyatt Sat Mar 24, 2012 3:03 am
                                    Re: stand pat or side to move bonus Larry Kaufman Sat Mar 24, 2012 3:14 am
                                          Re: stand pat or side to move bonus Robert Hyatt Sat Mar 24, 2012 4:41 am
                                                Re: stand pat or side to move bonus Marco Costalba Sat Mar 24, 2012 8:12 am
                                                      Re: stand pat or side to move bonus Robert Hyatt Mon Mar 26, 2012 5:32 am
                                                            Re: stand pat or side to move bonus Sam Hamilton Mon Mar 26, 2012 2:12 pm
                  Re: stand pat or side to move bonus Robert Hyatt Sat Mar 24, 2012 3:00 am
                        Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 7:53 pm
      Re: stand pat or side to move bonus Sune Fischer Sat Mar 24, 2012 10:38 am
      Re: stand pat or side to move bonus Vincent Diepeveen Sun Mar 25, 2012 9:08 am
            Re: stand pat or side to move bonus Uri Blass Sun Mar 25, 2012 11:24 am
                  Re: stand pat or side to move bonus Vincent Diepeveen Sun Mar 25, 2012 2:15 pm
            Re: stand pat or side to move bonus Ed Schroder Sun Mar 25, 2012 1:02 pm
                  Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 7:43 pm
                        Re: stand pat or side to move bonus Ed Schroder Sun Mar 25, 2012 8:37 pm
                              Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 8:51 pm
                                    Re: stand pat or side to move bonus Richard Vida Sun Mar 25, 2012 9:33 pm
                                          Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 9:48 pm
                                          Re: stand pat or side to move bonus Don Dailey Sun Mar 25, 2012 10:15 pm
                                          Re: stand pat or side to move bonus Vincent Diepeveen Mon Mar 26, 2012 10:48 pm
                                                Re: stand pat or side to move bonus Richard Vida Tue Mar 27, 2012 9:59 am
                                                      Re: stand pat or side to move bonus Vincent Diepeveen Tue Mar 27, 2012 11:38 am
                                    Re: stand pat or side to move bonus Ed Schroder Sun Mar 25, 2012 10:39 pm
            Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 3:49 pm
                  Re: stand pat or side to move bonus Vincent Diepeveen Sun Mar 25, 2012 4:20 pm
                        Re: stand pat or side to move bonus Larry Kaufman Sun Mar 25, 2012 4:47 pm
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