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Subject: Re: Nullmove implementation

Author: Benny Antonsson

Date: 07:23:13 05/20/02

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Alarm analyzis on a P3/533 MHz with 32 MB hash.

[D]r1b1r1k1/p1p3pp/2p2n2/2bp4/5P2/3BBQPq/PPPK3P/R4N1R b - - 0 1

With nullmoves:
1       92      0       127      Bg4
2       109     2       811      Bg4 Qf2
3       99      7       4680     Bg4 Qf2 Bb6
4       66      35      25457    Bg4 Qf2 Bb6 Kc1
5       110     66      44565    Bg4 Qf2 Bb6 Kc1 Ne4 Bxb6 cxb6 Bxe4 Rxe4
6       110     249     278029   Bg4 Qf2 Bb6 Kc1 Ne4 Bxb6 cxb6 Bxe4 Rxe4
7       108     921     1237281  Bg4 Qf2 Bb6 Bxb6 cxb6 Ne3 c5 Nxg4 Nxg4
8       97      3387    4760024  Bg4 Qf2 Bb6 Bxb6 cxb6 Ne3 c5 c3

Without nullmoves:
1       92      0       127      Bg4
2       109     2       798      Bg4 Qf2
3       99      7       4322     Bg4 Qf2 Bb6
4       66      44      28050    Bg4 Qf2 Bb6 Kc1
5       110     87      74448    Bg4 Qf2 Bb6 Kc1 Ne4 Bxb6 cxb6 Bxe4 Rxe4
6       110     478     667798   Bg4 Qf2 Bb6 Kc1 Ne4 Bxb6 cxb6 Bxe4 Rxe4
7       108     2491    3970606  Bg4 Qf2 Bb6 Bxb6 cxb6 Ne3 c5 Nxg4 Nxg4
8       97      13183   20784340 Bg4 Qf2 Bb6 Bxb6 cxb6 Ne3 c5 c3

In this position alam really benefits from nullmove pruning :)



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