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Comparative nodes per second
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Robert Hyatt



Joined: 27 Feb 2006
Posts: 15816
Location: Birmingham, AL
PostPost subject: Re: Comparative nodes per second    Posted: Sat Apr 14, 2012 4:28 am Reply to topic Reply with quote
lkaufman wrote:
bob wrote:
lkaufman wrote:
jdart wrote:
Quote:

Don't you have to do eval on the last four mainsearch plies in order to do futility pruning?


IIRC Crafty does futility based on material score only.

--Jon


What about for deciding whether to try null move or not? I don't see how Crafty could avoid calling the eval in the main search.


I always do null-move. I've tried all the alternatives and the only exception is that I use the hash table trick where entries with a draft that is too shallow can't be used to terminate the search, but they might have draft sufficient to tell me that a null-move search is hopeless.


Why would you want to waste time on null move if you are (let's say) a piece behind beta?


You can still have some unstoppable threat that the opponent can't fix even with two moves in a row... It is not really what I "want to do" but what has actually tested to be stronger in my program.

I do a null-move search unless any one of the following conditions is false:

1. previous ply did not try a null move;

2. hash table hit did not prove that a null-move would likely fail low and be worthless.

3. This is a null-window search (ie not the first move along a PV path, although once the PV-node window collapses to zero, null is done).

4. side on move is not in check

5. moving side has at least one piece left on the board.
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Subject Author Date/Time
Comparative nodes per second Larry Kaufman Tue Apr 10, 2012 7:49 pm
      Re: Comparative nodes per second Vincent Diepeveen Tue Apr 10, 2012 8:16 pm
      Re: Comparative nodes per second Marco Costalba Tue Apr 10, 2012 8:41 pm
            Re: Comparative nodes per second Larry Kaufman Tue Apr 10, 2012 9:02 pm
                  Re: Comparative nodes per second Thomas Petzke Tue Apr 10, 2012 9:30 pm
            Re: Comparative nodes per second Richard Vida Tue Apr 10, 2012 10:15 pm
                  Re: Comparative nodes per second Larry Kaufman Tue Apr 10, 2012 10:18 pm
                        Re: Comparative nodes per second Sam Hamilton Tue Apr 10, 2012 10:54 pm
                        Re: Comparative nodes per second Richard Vida Tue Apr 10, 2012 11:28 pm
                              Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 4:52 am
            Re: Comparative nodes per second Don Dailey Wed Apr 11, 2012 11:23 pm
                  Re: Comparative nodes per second Don Dailey Wed Apr 11, 2012 11:50 pm
                        Re: Comparative nodes per second Sam Hamilton Thu Apr 12, 2012 12:07 am
      Re: Comparative nodes per second Robert Hyatt Tue Apr 10, 2012 9:31 pm
            Re: Comparative nodes per second Larry Kaufman Tue Apr 10, 2012 9:35 pm
                  Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 1:10 am
      Re: Comparative nodes per second Daniel Shawul Tue Apr 10, 2012 11:41 pm
            Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 5:05 am
                  Re: Comparative nodes per second Sam Hamilton Wed Apr 11, 2012 5:28 am
                        Re: Comparative nodes per second Marco Costalba Wed Apr 11, 2012 5:58 am
                              Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 1:04 pm
                  Re: Comparative nodes per second Daniel Shawul Wed Apr 11, 2012 12:27 pm
      Re: Comparative nodes per second Jon Dart Wed Apr 11, 2012 1:59 pm
            Re: Comparative nodes per second Sam Hamilton Wed Apr 11, 2012 2:25 pm
                  Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 2:36 pm
                        Re: Comparative nodes per second Jon Dart Wed Apr 11, 2012 3:06 pm
            Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 2:28 pm
                  Re: Comparative nodes per second Jon Dart Wed Apr 11, 2012 3:10 pm
                        Re: Comparative nodes per second Larry Kaufman Wed Apr 11, 2012 3:59 pm
                              Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 1:19 am
                  Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 1:15 am
                        Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 1:35 am
                              Re: Comparative nodes per second Sam Hamilton Thu Apr 12, 2012 2:32 am
                                    Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 2:50 am
                                          Re: Comparative nodes per second Sam Hamilton Thu Apr 12, 2012 3:10 am
                                                Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 3:35 am
                              Re: Comparative nodes per second Jon Dart Thu Apr 12, 2012 2:37 pm
                                    Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 3:24 pm
                                          Re: Comparative nodes per second Jon Dart Thu Apr 12, 2012 4:25 pm
                                                Re: Comparative nodes per second Don Dailey Thu Apr 12, 2012 4:33 pm
                                                      Re: Comparative nodes per second Jon Dart Thu Apr 12, 2012 4:41 pm
                                                      Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 8:13 pm
                                                            Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 9:00 pm
                                                            Re: Comparative nodes per second Daniel Homan Thu Apr 12, 2012 9:52 pm
                                                                  Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 11:26 pm
                                                                        Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 11:40 pm
                                                                              Re: Comparative nodes per second Sam Hamilton Thu Apr 12, 2012 11:51 pm
                                                                              Re: Comparative nodes per second Robert Hyatt Sat Apr 14, 2012 4:23 am
                                                                        Re: Comparative nodes per second Uri Blass Sat Apr 14, 2012 5:05 pm
                                                                              Re: Comparative nodes per second Robert Hyatt Sat Apr 14, 2012 6:46 pm
                                                                                    Re: Comparative nodes per second Don Dailey Sat Apr 14, 2012 6:56 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Sun Apr 15, 2012 4:31 am
                                                                                    Re: Comparative nodes per second Larry Kaufman Sat Apr 14, 2012 7:47 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Sun Apr 15, 2012 4:36 am
                                                                                          Re: Comparative nodes per second Larry Kaufman Sun Apr 15, 2012 4:47 am
                                                                                          Re: Comparative nodes per second Robert Hyatt Mon Apr 16, 2012 7:14 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Tue Apr 17, 2012 3:02 pm
                                          Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 6:50 pm
                                                Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 8:12 pm
                                                      Re: Comparative nodes per second Robert Hyatt Sat Apr 14, 2012 4:28 am
                                                            Re: Comparative nodes per second Larry Kaufman Sat Apr 14, 2012 4:45 am
                                                                  Re: Comparative nodes per second Robert Hyatt Sat Apr 14, 2012 4:46 pm
                                                                        Re: Comparative nodes per second Larry Kaufman Sat Apr 14, 2012 5:10 pm
                                                                              Re: Comparative nodes per second Sam Hamilton Sat Apr 14, 2012 5:35 pm
                                                                              Re: Comparative nodes per second Robert Hyatt Sun Apr 15, 2012 4:38 am
                                                                                    Re: Comparative nodes per second Larry Kaufman Sun Apr 15, 2012 4:51 am
                                                                                          Re: Comparative nodes per second Robert Hyatt Mon Apr 16, 2012 7:20 pm
                                                                                    Re: Comparative nodes per second Don Dailey Sun Apr 15, 2012 12:14 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Mon Apr 16, 2012 7:21 pm
                                                                  Re: Comparative nodes per second Uri Blass Sat Apr 14, 2012 5:17 pm
                                                                        Re: Comparative nodes per second Larry Kaufman Sat Apr 14, 2012 5:22 pm
                                                                              Re: Comparative nodes per second Uri Blass Sat Apr 14, 2012 5:36 pm
                                                                                    Re: Comparative nodes per second Larry Kaufman Sat Apr 14, 2012 5:47 pm
                                    Re: Comparative nodes per second Sam Hamilton Thu Apr 12, 2012 4:49 pm
                                          Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 5:14 pm
                                                Re: Comparative nodes per second Jon Dart Thu Apr 12, 2012 6:00 pm
                                                      Re: Comparative nodes per second Uri Blass Thu Apr 12, 2012 6:37 pm
                                                            Re: Comparative nodes per second Jon Dart Thu Apr 12, 2012 6:50 pm
                                                            Re: Comparative nodes per second Uri Blass Thu Apr 12, 2012 6:53 pm
                                                                  Re: Comparative nodes per second Lucas Braesch Sun Apr 15, 2012 4:56 am
                                                                        Re: Comparative nodes per second Uri Blass Sun Apr 15, 2012 5:16 am
                                                                              Re: Comparative nodes per second Lucas Braesch Sun Apr 15, 2012 7:58 am
                                                                        Re: Comparative nodes per second Don Dailey Sun Apr 15, 2012 1:10 pm
                                                                              Re: Comparative nodes per second Uri Blass Sun Apr 15, 2012 2:48 pm
                                                                                    Re: Comparative nodes per second Don Dailey Sun Apr 15, 2012 3:26 pm
                                                                                    Re: Comparative nodes per second Robert Hyatt Tue Apr 17, 2012 5:17 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 6:05 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Tue Apr 17, 2012 7:11 pm
                                                                                          Re: Comparative nodes per second Don Dailey Tue Apr 17, 2012 6:06 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 6:16 pm
                                                                                          Re: Comparative nodes per second Don Dailey Tue Apr 17, 2012 6:45 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 6:55 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Tue Apr 17, 2012 7:16 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 7:25 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Tue Apr 17, 2012 7:59 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 8:14 pm
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Tue Apr 17, 2012 10:33 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Tue Apr 17, 2012 10:51 pm
                                                                                          Re: Comparative nodes per second Vincent Diepeveen Wed Apr 18, 2012 12:12 am
                                                                                          Re: Comparative nodes per second Sam Hamilton Wed Apr 18, 2012 12:28 am
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Wed Apr 18, 2012 2:28 am
                                                                                          Re: Comparative nodes per second Sam Hamilton Wed Apr 18, 2012 4:32 am
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Wed Apr 18, 2012 4:44 am
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Tue Apr 17, 2012 10:28 pm
                                                                              Re: Comparative nodes per second José C. Martínez Galán Wed Apr 18, 2012 6:16 am
                                                                                    Re: Comparative nodes per second Robert Hyatt Thu Apr 19, 2012 9:53 pm
                                                                                    Re: Comparative nodes per second Don Dailey Thu Apr 19, 2012 10:22 pm
                                                                                          Re: Comparative nodes per second José C. Martínez Galán Thu Apr 19, 2012 10:49 pm
                                                                                          Re: Comparative nodes per second Robert Hyatt Thu Apr 19, 2012 11:21 pm
                                                                                          Re: Comparative nodes per second Marco Costalba Fri Apr 20, 2012 5:18 am
                                                                                          Re: Comparative nodes per second Michel Van den Bergh Fri Apr 20, 2012 6:10 am
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Fri Apr 20, 2012 11:35 am
                                                                                          Re: Comparative nodes per second Don Dailey Fri Apr 20, 2012 10:57 am
                                                                                          Re: Comparative nodes per second Marco Costalba Fri Apr 20, 2012 1:58 pm
                                                                                          Re: Comparative nodes per second Sam Hamilton Fri Apr 20, 2012 2:19 pm
                                                                                          Re: Comparative nodes per second Miguel A. Ballicora Fri Apr 20, 2012 2:29 pm
                                                                                          Re: Comparative nodes per second Don Dailey Fri Apr 20, 2012 3:13 pm
                                                                                          Re: Comparative nodes per second Don Dailey Fri Apr 20, 2012 4:52 pm
                                                                                          Re: Comparative nodes per second Uri Blass Sat Apr 21, 2012 6:03 am
                                                                                          Re: Comparative nodes per second Marco Costalba Sat Apr 21, 2012 8:14 am
                                                                                          Re: Comparative nodes per second Ed Schroder Sat Apr 21, 2012 10:50 am
                                                                                          Re: Comparative nodes per second Marco Costalba Sat Apr 21, 2012 11:13 am
                                                                                          Re: Comparative nodes per second Don Dailey Fri Apr 20, 2012 12:31 pm
                                                                                          Re: Comparative nodes per second Dan Andersson Fri Apr 20, 2012 4:14 pm
                                                                                          Re: Comparative nodes per second Don Dailey Fri Apr 20, 2012 4:38 pm
                                                            Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 7:10 pm
                                                Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 6:55 pm
                                                      Re: Comparative nodes per second (early results) Robert Hyatt Thu Apr 12, 2012 7:36 pm
                              Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 7:13 pm
                                    Re: Comparative nodes per second Larry Kaufman Thu Apr 12, 2012 8:18 pm
                                          Re: Comparative nodes per second Robert Hyatt Thu Apr 12, 2012 8:55 pm
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