🚀 go-pugleaf

There is a bug in PutInTTable() in ttable.c whereby mate scores are
incorrectly stored.  This was fixed in pl68, but reappeared in pl 69
and 70.  The patch for it appears below.

Kong Sian


*** /usr/people/kongsian/gnuchess-4.0/src/ttable.c	Tue May 10 05:44:23 1994
--- ttable.c	Sun May 15 16:17:58 1994
***************
*** 235,242 ****
  #endif
  	if(ptbl->depth > (UCHAR)depth) return false;
    /* adjust score so moves to mate is from this ply */
- 	if (score > 9000) score += ply;
- 	else if (score < -9000) score -= ply;
  	ptbl->hashbd = hashbd;
  	ptbl->depth = (UCHAR) depth;
  	ptbl->score = score;
--- 235,240 ----
***************
*** 254,260 ****
--- 252,262 ----
  		ptbl->score = beta + 1;
  	  }
  	else
+ 	  {
+ 	        if (score > 9000) score += ply;
+ 	        else if (score < -9000) score -= ply;
  		ptbl->flags = truescore;
+ 	  }
  
  #ifdef HASHSTATS
  	ttdepthin[ptbl->depth]++;