Bug in 4PL68 eval.c

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Article #5124

#5124

From: Roger Uzun
Date: Fri, 18 Feb 1994 11:16

46 lines
1918 bytes

There is a problem in gnuchess 4pl68 around line 661, the slk
code looks wrong, a mix of 2 fixes that will probably fail.

In 4pl68 at line 661 we see:

	if ( !slk && ply == 1 ||
#ifdef CACHE
    	(CheckEETable (side)) ||
#endif
	slk ||
        (flag.neweval ? ((
        (ply==Sdepth || (!ext && depth == 0 && s>=alpha-30 && s<=beta+30)) ||
        (ext && (s >= (alpha - 30) && s <= (beta + 30)) )) )
        :
        ((Sdepth ==  ply) ||
        (ply > Sdepth && (s >= (alpha - 30) && s <= (beta + 30)) )) )
        )

=====================
We should see:

        if ( !slk && (ply == 1 ||
#ifdef CACHE
        (CheckEETable (side)) ||
#endif
        (flag.neweval ? ((
        (ply==Sdepth || (!ext && depth == 0 && s>=alpha-30 &&
s<=beta+30)) ||
        (ext && (s >= (alpha - 30) && s <= (beta + 30)) )) )
        :
        ((Sdepth ==  ply) ||
        (ply > Sdepth && (s >= (alpha - 30) && s <= (beta + 30)) )) )
        ))


You should not do the code if slk is true...it would seem to me.
Can someone tell me if 4pl68 is correct as is?  would
you want to have the || slk after CheckEETable(side) ???


-Roger
uzun@crash.cts.com

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From: uzun@crash.cts.com (Roger Uzun)
Subject: Bug in 4PL68 eval.c
Organization: CTS Network Services (CTSNET/crash), San Diego, CA
Date: Fri, 18 Feb 1994 11:16:53 GMT
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