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Subject: "Parallel chess searching and bitboards"

Author: Dann Corbit

Date: 11:33:41 09/17/04

http://www.imm.dtu.dk/pubdb/views/publication_details.php?id=3267

I got ~96% efficiency, going from 1 thread to 2 threads on a dual CPU machine.
1172442 / 599317 = 1.9563


WindowsNT Mgibian 0 5 x86
Reading 'WAC230.EPD'
Thread 0 created (main thread)
Threads started: 1
Setting up FEN: 2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - bm Rb4; id
"WAC.230";
time nodes depth score pv
00:00:00.00             1 01|01|01 +1.095 Kd7
00:00:00.00            16 ---------------------------------------------------
 --
00:00:00.00           104 02|02|03 +0.595 Kd7 Kg2
00:00:00.00           149 ---------------------------------------------------
 ++
00:00:00.00           293 03|03|03 +1.395 Kd7 Kg2 Ke8
00:00:00.00           323 ---------------------------------------------------
 --
00:00:00.00           579 04|04|05 +0.895 Kd7 Kg2 Ke8 Kg1
00:00:00.00           745 ---------------------------------------------------
00:00:00.00          1060 05|05|06 +0.955 Kd7 Kg2 Ke8 Kg1 Bd7
00:00:00.00          1573 ---------------------------------------------------
00:00:00.00          2913 06|06|07 +0.940 Kd7 Kg2 Ke8 Kg1 Bd7 f4
00:00:00.00          3350 ---------------------------------------------------
00:00:00.01          4919 07|07|08 +0.950 Kd7 Kg2 Ke8 Kg1 Bd7 f4 Bc6
 ++
00:00:00.03         19587 07|07|09 +1.380 Rf7 Kg2 Kb7 Rd2 Rf5 Kg1 Rxg5
00:00:00.03         20127 ---------------------------------------------------
00:00:00.07         46353 08|09|11 +1.090 Rf7 Kg2 Kd7 Kg1 Rf5 f4 Rxf4 Rd2
00:00:00.07         49469 ---------------------------------------------------
00:00:00.20        122131 09|12|13 +0.965 Rf7 Rb1 Kd7 Ra1 b2 Rb1 Ke8 Rxb2 Bd7
00:00:00.28        161342 ---------------------------------------------------
00:00:00.57        340212 10|13|16 +0.950 Rf7 Rb1 Bb7 Ra1 Kd7 Rxa5 Ke8 f4 b2 Rb5
00:00:00.84        512496 10|13|16 +1.060 Kd7 f4 Ke8 Kh2 Rh7 Kg1 Rh3 Bc7 Rg3 Kh1
Rxc3 Bxa5
00:00:00.84        514536 ---------------------------------------------------
00:00:00.95        589447 11|14|16 +0.955 Kd7 Kg2 Ke8 Rb1 Bd7 Kg1 Bc6 f4 Rf7 Rf1
Rd7
00:00:01.54        922874 11|14|17 +0.975 Rf7 Rb1 Rf5 Be7 Kd7 Bf6 Ke8 Ra1 Bd7
Rxa5 Bc6
00:00:01.62        970894 ---------------------------------------------------

 time used: 00:00:01.62
 nps: 599317 nodes: 970894 Q-nodes: 95579 (9%)
 move order: 89%
 hash probes: 338964 hash hits: 199491 (58%)
 hash usage: 20%

My move: Rf7



WindowsNT Mgibian 0 5 x86
Reading 'WAC230.EPD'
Thread 0 created (main thread)
Creating worker thread 1
Threads started: 2
Setting up FEN: 2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - bm Rb4; id
"WAC.230";
time nodes depth score pv
00:00:00.00             1 01|01|01 +1.095 Kd7
00:00:00.00            16 ---------------------------------------------------
 --
00:00:00.00           104 02|02|03 +0.595 Kd7 Kg2
00:00:00.00           149 ---------------------------------------------------
 ++
00:00:00.00           293 03|03|03 +1.395 Kd7 Kg2 Ke8
00:00:00.00           323 ---------------------------------------------------
 --
00:00:00.00           580 04|04|05 +0.895 Kd7 Kg2 Ke8 Kg1
00:00:00.00           746 ---------------------------------------------------
00:00:00.00          1063 05|05|06 +0.955 Kd7 Kg2 Ke8 Kg1 Bd7
00:00:00.00          1585 ---------------------------------------------------
00:00:00.00          2948 06|06|07 +0.940 Kd7 Kg2 Ke8 Kg1 Bd7 f4
00:00:00.00          3385 ---------------------------------------------------
00:00:00.00          5013 07|07|08 +0.950 Kd7 Kg2 Ke8 Kg1 Bd7 f4 Bc6
 ++
00:00:00.06         22019 07|07|09 +1.380 Rf7 Kg2 Kb7 Rd2 Rf5 Kg1 Rxg5
00:00:00.06         22573 ---------------------------------------------------
00:00:00.08         50490 08|09|11 +1.090 Rf7 Kg2 Kd7 Kg1 Rf5 f4 Rxf4 Rd2
00:00:00.09         53702 ---------------------------------------------------
00:00:00.17        147570 09|12|13 +0.965 Rf7 Rb1 Kd7 Ra1 b2 Rb1 Ke8 Rxb2 Bd7
00:00:00.20        190707 ---------------------------------------------------
00:00:00.36        374858 10|13|16 +0.950 Rf7 Rb1 Bb7 Ra1 Kd7 Rxa5 Ke8
00:00:00.52        575781 10|13|16 +1.060 Kd7 f4 Ke8 Kh2 Rh7 Kg1 Rh3 Bc7 Rg3 Kh1
Rxc3 Bxa5
00:00:00.52        577991 ---------------------------------------------------
00:00:00.63        711651 11|15|16 +0.960 Kd7 Kg2 Ke8 Rb1 Bd7 Kg1 Bc6 f4 b2
00:00:01.03       1202303 11|15|17 +0.975 Rf7 Rb1 Rf5 Be7 Kd7 Bf6 Ke8 Ra1 Bd7
Rxa5 Bc6
00:00:01.06       1242789 ---------------------------------------------------

 time used: 00:00:01.06
 nps: 1172442 nodes: 1242789 Q-nodes: 122113 (9%)
 move order: 90%
 hash probes: 457029 hash hits: 269083 (58%)
 hash usage: 25%

My move: Rf7

Re: "Parallel chess searching and bitboards" Gerd Isenberg 00:39:00 09/18/04
- Re: "Parallel chess searching and bitboards" Robert Hyatt 14:24:55 09/18/04
- Re: "Parallel chess searching and bitboards" Gian-Carlo Pascutto 01:26:55 09/18/04
  - Re: "Parallel chess searching and bitboards" Gerd Isenberg 02:23:46 09/18/04
Re: "Parallel chess searching and bitboards" Omid David Tabibi 14:49:22 09/17/04
- Re: "Parallel chess searching and bitboards" Dann Corbit 14:54:59 09/17/04
  - Re: "Parallel chess searching and bitboards" Omid David Tabibi 15:05:59 09/17/04
    - Re: "Parallel chess searching and bitboards" Jorge Pichard 07:19:20 09/18/04
      - Re: "Parallel chess searching and bitboards" Dann Corbit 10:43:41 09/20/04
This is funny (inside) Gian-Carlo Pascutto 13:56:52 09/17/04
- Re: This is funny (inside) Dann Corbit 14:49:50 09/17/04
  - Re: This is funny (inside) Uri Blass 15:09:23 09/17/04
    - Re: This is funny (inside) Omid David Tabibi 05:48:52 09/18/04
    - Re: This is funny (inside) Robert Hyatt 17:43:54 09/17/04
    - Re: This is funny (inside) Dann Corbit 15:21:10 09/17/04
  - Re: This is funny (inside) Gian-Carlo Pascutto 14:54:03 09/17/04
    - Re: This is funny (inside) Robert Hyatt 17:46:26 09/17/04
    - Re: This is funny (inside) martin fierz 15:23:16 09/17/04
      - Re: This is funny (inside) Dann Corbit 15:33:53 09/17/04
        
        Re: This is funny (inside) Uri Blass 20:23:33 09/17/04
    - Re: This is funny (inside) Dann Corbit 14:57:15 09/17/04
      - Re: This is funny (inside) Gian-Carlo Pascutto 15:05:02 09/17/04
        
        Re: This is funny (inside) Dann Corbit 15:55:53 09/17/04
        
        Re: This is funny (inside) Robert Hyatt 17:47:51 09/17/04
        
        Re: This is funny (inside) Dann Corbit 15:07:02 09/17/04
  - Re: This is funny (inside) Dann Corbit 14:51:46 09/17/04
Re: "Parallel chess searching and bitboards" Gian-Carlo Pascutto 13:37:12 09/17/04
Rasmussen's thesis: There is a parallel chess program known as Crafty(?) Anthony Cozzie 13:37:01 09/17/04
- Not at all Gian-Carlo Pascutto 13:49:29 09/17/04
Re: "Parallel chess searching and bitboards" Stuart Cracraft 13:24:41 09/17/04

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