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Subject: Re: DB will never play with REBEL, they simple are afraid no to do well

Author: Ratko V Tomic

Date: 16:11:48 10/15/99

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> IE alpha/beta alone reduces the effective branching factor
> from 38 to roughly sqrt(38) == 6.  Null move can reduce this by 1/2.

Does Crafty has really an effective branching factor of 3 in typical middle
games in the full width search? Also, what's your guess on the proportion of
junk searched in such case. For the sake of simplicity we could define "junk"
anything that is, say, 1/2 pawn worse than the root node value (it could be
the running value of PV for simpler test). Would the percentage of the non-junk
nodes (e.g. the nodes within 1/2 pawn from PV value) go exponentially to zero
with depth? (That was the original point of disagreement in this small
exchange.)

I think it would be interesting if you could find time to rig your development
Crafty with few counters and get the proportions of (non-)junk in relation to
depth and also possibly its dependence on the delta (such as 1/2 pawn)
separating the junk from the non-junk.

• Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 20:53:31 10/15/99
  • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 00:54:35 10/16/99
    • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 07:52:04 10/16/99
      • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 10:41:17 10/16/99
        • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 20:09:23 10/16/99
    • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 05:01:59 10/16/99
      • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 07:56:08 10/16/99
        • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 13:40:17 10/16/99
          • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 17:24:16 10/16/99
            • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 17:54:24 10/16/99
              • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 23:50:14 10/16/99
                • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 08:25:49 10/17/99
                  • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 09:48:54 10/17/99
                    • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 11:00:43 10/17/99
                      • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 12:57:06 10/17/99
                        • Re: DB will never play with REBEL, they simple are afraid no to do well Jeremiah Penery 13:12:03 10/17/99
                          • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 13:45:43 10/17/99
                            • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 21:13:03 10/17/99
                              • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 09:23:00 10/18/99
                                • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 12:15:24 10/18/99
    • Re: DB will never play with REBEL, they simple are afraid no to do well Dan Newman 01:21:02 10/16/99
      • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 01:40:54 10/16/99
        • Re: DB will never play with REBEL, they simple are afraid no to do well Dan Newman 11:40:53 10/16/99
          • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 12:36:06 10/16/99
            • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 07:34:33 10/17/99
              • Re: DB will never play with REBEL, they simple are afraid no to do well Ratko V Tomic 10:08:05 10/17/99
                • Re: DB will never play with REBEL, they simple are afraid no to do well Robert Hyatt 18:00:19 10/17/99

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