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Subject: mate threat extension/null move

Author: Rick Bischoff

Date: 07:30:52 09/25/04

Hi,

I am confused about the mate threat extension.  I have the following code:

search ( depth, alpha, beta )

->check extension
->else pawn extension

->if depth <= 0 do the queiscent

->if checkReps return draw
->if insufficnetMaterial return draw

->Probe the hash table and return if good

->if not in check and depth>3 and last move was not null and material is ok:
->-> do null move
->-> x = -search(depth - 3, -beta, -beta +1 )
->-> undo null move
->-> if ( x >= beta ) return beta
->-> if ( x < (-MATE+MAXPLY) ) cout << "found mate"

->normal alpha/beta stuff

end search

"found mate" never gets printed out in WAC141 unless I change the null move to a
full width search... Why?  Well, I shouldn't say never, but I let it run to ply
9.

Re: mate threat extension/null move Michael Henderson 13:10:30 09/25/04
- Re: mate threat extension/null move Rick Bischoff 21:07:00 09/25/04
Re: mate threat extension/null move Andrew Platt 13:02:08 09/25/04
- Re: mate threat extension/null move Rick Bischoff 20:56:39 09/25/04
  - Re: mate threat extension/null move Andrew Platt 10:20:54 09/26/04
    - Re: mate threat extension/null move Rick Bischoff 10:39:01 09/26/04
- Re: mate threat extension/null move Stuart Cracraft 13:35:05 09/25/04
  - Re: mate threat extension/null move Robert Hyatt 15:17:19 09/27/04
    - Re: mate threat extension/null move Stuart Cracraft 21:01:15 09/27/04
      - Re: mate threat extension/null move Robert Hyatt 07:25:16 09/28/04
        
        Re: mate threat extension/null move Stuart Cracraft 07:23:20 09/29/04
        
        Re: mate threat extension/null move Don Beal 19:04:41 09/29/04
        
        Re: mate threat extension/null move Stuart Cracraft 09:43:48 10/01/04
        
        Re: mate threat extension/null move Don Beal 12:02:40 10/01/04
        
        Re: mate threat extension/null move Stuart Cracraft 16:13:55 10/01/04
        
        Re: mate threat extension/null move Don Beal 16:44:31 10/02/04
        
        Re: mate threat extension/null move Stuart Cracraft 09:11:56 10/04/04
        
        Re: mate threat extension/null move Don Beal 17:23:27 10/04/04
        
        Re: mate threat extension/null move Stuart Cracraft 15:41:58 10/05/04
        
        Re: mate threat extension/null move Michael Henderson 11:49:29 10/07/04
        
        Re: mate threat extension/null move Michael Henderson 12:03:58 10/07/04
        
        Re: mate threat extension/null move Uri Blass 02:19:27 10/06/04
        
        Re: mate threat extension/null move Tony Werten 03:38:28 10/06/04
        
        Re: mate threat extension/null move Uri Blass 04:29:41 10/06/04
        
        Re: mate threat extension/null move Don Beal 02:57:36 10/05/04
        
        Re: mate threat extension/null move Stuart Cracraft 16:12:13 10/05/04
        
        Re: mate threat extension/null move Gerd Isenberg 12:49:00 10/05/04
        
        Re: mate threat extension/null move Don Beal 14:02:35 10/05/04
        
        Re: mate threat extension/null move Steve Maughan 06:21:54 10/05/04
        
        Re: mate threat extension/null move Don Beal 13:36:29 10/05/04
        
        Re: mate threat extension/null move Uri Blass 10:17:27 10/01/04
        
        Re: mate threat extension/null move Stuart Cracraft 10:32:27 10/01/04
        
        Re: mate threat extension/null move Uri Blass 14:09:08 10/01/04
        
        Re: mate threat extension/null move Stuart Cracraft 16:37:34 10/01/04
        
        Re: mate threat extension/null move Robert Hyatt 07:37:08 09/29/04
        
        Re: mate threat extension/null move Stuart Cracraft 11:16:23 09/29/04
        
        Re: mate threat extension/null move Dan Honeycutt 11:51:16 09/29/04
        
        Re: mate threat extension/null move Uri Blass 13:06:36 09/29/04
        
        Re: mate threat extension/null move Dan Honeycutt 14:36:16 09/29/04
        
        Re: mate threat extension/null move Stuart Cracraft 14:29:57 09/29/04
        
        Re: mate threat extension/null move Michael Henderson 15:52:45 09/29/04
        
        Re: mate threat extension/null move Stuart Cracraft 16:32:27 09/29/04
        
        Re: mate threat extension/null move Michael Henderson 17:12:26 09/29/04
  - Re: mate threat extension/null move Andrew Platt 14:19:04 09/25/04
    - Re: mate threat extension/null move Stuart Cracraft 19:35:37 09/25/04
      - right now, at this very moment wac 141? David B Weller 12:53:53 09/26/04
        
        Re: right now, at this very moment wac 141? Stuart Cracraft 22:04:52 09/27/04
        
        Re: right now, at this very moment wac 141? Henk Bossinade 10:39:44 09/28/04
        
        Re: right now, at this very moment wac 141? Stuart Cracraft 19:45:47 09/28/04
        
        Re: right now, at this very moment wac 141? Uri Blass 13:21:43 09/29/04
        
        Re: right now, at this very moment wac 141? martin fierz 15:20:45 09/29/04
        
        Re: right now, at this very moment wac 141? Uri Blass 15:34:40 09/29/04
        
        Re: right now, at this very moment wac 141? Stuart Cracraft 16:54:50 09/29/04
        
        Re: right now, at this very moment wac 141? Robert Hyatt 15:19:01 09/30/04
        
        Re: right now, at this very moment wac 141? Uri Blass 20:02:42 09/30/04
        
        Re: right now, at this very moment wac 141? Robert Hyatt 21:01:02 09/30/04
        
        Re: right now, at this very moment wac 141? Uri Blass 00:00:25 10/01/04
        
        Re: right now, at this very moment wac 141? Robert Hyatt 07:15:31 10/01/04
        
        Re: right now, at this very moment wac 141? Stuart Cracraft 16:58:54 09/29/04
        
        Re: right now, at this very moment wac 141? Uri Blass 01:53:48 09/30/04
        
        Re: right now, at this very moment wac 141? Stuart Cracraft 15:20:32 09/30/04
        
        I WISH I KNEW!!! David B Weller 11:53:41 09/29/04
        
        Re: I WISH I KNEW!!! Stuart Cracraft 16:51:47 09/29/04
      - Re: mate threat extension/null move Stuart Cracraft 21:50:45 09/25/04
        
        Re: mate threat extension/null move Rick Bischoff 05:25:04 09/26/04
        
        Re: mate threat extension/null move Robert Hyatt 20:57:31 09/26/04
        
        Re: mate threat extension/null move Uri Blass 22:40:41 09/26/04
        
        Re: mate threat extension/null move Robert Hyatt 08:26:44 09/28/04
        
        Re: mate threat extension/null move Stuart Cracraft 20:58:24 09/27/04
Re: mate threat extension/null move Peter Fendrich 09:32:26 09/25/04
- Re: mate threat extension/null move Zach Wegner 10:51:39 09/25/04
  - Re: mate threat extension/null move Peter Fendrich 11:46:06 09/25/04
    - Re: mate threat extension/null move Zach Wegner 11:59:07 09/25/04
      - Re: mate threat extension/null move Stuart Cracraft 12:18:22 09/25/04
        
        Re: mate threat extension/null move Zach Wegner 13:08:10 09/25/04
        
        Re: mate threat extension/null move Stuart Cracraft 21:09:10 09/25/04
Re: mate threat extension/null move Bas Hamstra 07:58:13 09/25/04
- Re: mate threat extension/null move Rick Bischoff 20:59:27 09/25/04
  - Re: mate threat extension/null move Bas Hamstra 06:20:52 09/26/04
  - Re: mate threat extension/null move Stuart Cracraft 21:13:20 09/25/04
    - Re: mate threat extension/null move Bas Hamstra 06:29:12 09/26/04

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