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Subject: Re: Turning null-move off

Author: Bernhard Bauer

Date: 04:29:04 10/08/01

Go up one level in this thread

On October 07, 2001 at 21:39:52, Robert Hyatt wrote:

>
>2.  You can tone down (or even disable) the null-move search.  You can
>try sel=2/3 (the default) then sel=2/2, sel=1/1, and finally sel=0/0 which
>will turn null-move off.  This will further reduce the search depth and overall
>strength.
>

From my experience sel=0/0 doesn't turn null-move completely off.
Here an example with sel=0/0

[D]4B/8/6N/5p/1r4p/6pk/7b/4K2Q w - -


        (4)    6->   1.90  -0.44   1. Bc6 Rb1+ 2. Ke2 Rxh1 3. Nf4+ Kh4
                                   4. Bxh1 Kg5 5. Ke3
        (3)    7     1.96  -0.22   1. Bc6 Rb1+ 2. Ke2 Rxh1 3. Nf4+ Kh4
                                   4. Bxh1 Bg1 5. Bg2 Bd4
               7     2.75     ++   1. Kd2!!
        (2)    7     3.79   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3
        (2)    7->   6.29   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3
               8     8.14   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3
        (2)    8->  14.57   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3
               9    20.50   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3 10. Nf4
        (2)    9->  42.50   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3 10. Nf4
              10     1:05   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3 10. Nf4 Bxf4
        (2)   10->   2:22   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3 10. Nf4 Bxf4
              11     3:35   0.00   1. Kd2 g2 2. Qe1 g1=Q 3. Qh4+ Kg2 4.
                                   Bc6+ Re4 5. Bxe4+ fxe4 6. Qxg4+ Kh1
                                   7. Qxe4+ Qg2+ 8. Ke3 Qxe4+ 9. Kxe4
                                   Bg3 10. Nf4 Bxf4 11. Kxf4 Kh2
             time=5:00  cpu=201%  mat=4  n=142525014  fh=89%  nps=474k
             ext-> chk=10823921 cap=287226 pp=207595 1rep=668532 mate=112510
             predicted=0  nodes=142525014  evals=28834988
             endgame tablebase-> probes done=0  successful=0
             hashing-> trans/ref=47%  pawn=99%  used=99%
             SMP->  split=1018  stop=90  data=7/32  cpu=10:05  elap=5:00


Kind regards
Bernhard

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