Computer Chess Club Archives




Subject: Re: So how do we tell when to avoid null-move?

Author: Dan Homan

Date: 14:57:59 11/05/99

Go up one level in this thread

On November 05, 1999 at 17:11:08, Dann Corbit wrote:

>On November 05, 1999 at 16:18:47, Dan Homan wrote:
>>I missed an obvious simplification in my verification search.  Here
>>is the output of my program with Null Move - ON + verification search.
>>At large depths the speed here is much faster than the previous post
>>due to the simplification I found.
>> - Dan
>>P.S.  Does anyone have any other good null-move killer positions to
>Don't know for sure if these are all null moves.  I ran a script that filtered
>for the word combination "null move" and also contained epd positions.  So these
>are probably null move problems.  I will run another one looking for Zugzwang.
>Your new code seems to do very well.  Would you be willing to show me exactly
>what you did?

Sure, I described it in a previous post, but I'll make up some pseudo-code
tonight to make it very clear what I did. Unfortunately I am short of
time right now.....

 - Dan

>2k1q3/2p3n1/p1Np4/3P3p/P2P1p2/1Q5P/1KP5/8 w - -
>2k2b1r/1p1b1p2/p2p1Pr1/q1p1p2N/P1P1Q3/1P3N2/2P2PPP/3RR1K1 w - - bm Nxe5;
>2r1r1k1/3p1p1p/p2Qp1p1/q1N2P2/Pn1B1P2/6P1/2P3bP/2KRR3 b - -
>2r2rk1/1bpR1p2/1pq1pQp1/p3P2p/P1PR3P/5N2/2P2PPK/8 w - -
>3Q4/kp4pp/p3qr2/8/P1N1p3/1P1nP2P/2R3P1/6K1 w - - bm a5;
>6k1/1R6/6Pp/3rbp1P/1P3B2/5K2/8/8 b - -
>6k1/2n2p2/7p/4PPPP/2K1P3/8/8/8 w - -
>7k/4K2p/7P/3p4/8/4Q3/1q6/8 w - -
>8/2B5/8/6pp/7k/7P/6P1/4q1K1 w - -
>8/p7/P5p1/7p/7P/4kpK1/8/8 w - -
>bn6/1q4n1/1p1p1kp1/2pPp1pp/1PP1P1P1/3N1P1P/4B1K1/2Q2N2 w - -
>kbK5/1p6/pP6/8/8/8/R7/8 w - -
>kbK5/pp6/1P6/8/8/8/R7/8 w - -
>r3k2r/p2qnpb1/1pp3p1/3pP1Bp/3P2n1/Q1NB4/PP2RPPP/R5K1 w kq -
>r3r1k1/3b1p1p/2p4q/p2p4/3P2p1/1PNPPpP1/P1RQ1P1P/5RK1 w - -

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