Fix futility pruning

[hachu.git] / hachu.c

diff --git a/hachu.c b/hachu.c
index 711ec43..a8828c5 100644 (file)
--- a/hachu.c
+++ b/hachu.c
@@ -1909,7 +1909,11 @@ if(PATH) printf("%d:%2d:%2d next victim %d/%d\n",level,depth,iterDep,curMove,msp
              if(to == ABSENT) continue;              // ignore if absent\r
              if(!attacks[2*to + stm]) continue;      // skip if not attacked\r
              group = p[nextVictim].value;            // remember value of this found victim\r
-             if(iterDep <= QSdepth + 1 && 2*group + curEval + 30 < alpha) { resDep = QSdepth + 1; goto cutoff; }\r
+             if(iterDep <= QSdepth + 1 && 2*group + curEval + 30 < alpha) {\r
+               resDep = QSdepth + 1; nextVictim -= 2;\r
+               if(bestScore < 2*group + curEval + 30) bestScore = 2*group + curEval + 30;\r
+               goto cutoff;\r
+             }\r
 if(PATH) printf("%d:%2d:%2d group=%d, to=%c%d\n",level,depth,iterDep,group,to%BW+'a',to/BW+ONE);\r
              GenCapts(to, 0);\r
 if(PATH) printf("%d:%2d:%2d first=%d msp=%d\n",level,depth,iterDep,firstMove,msp);\r
@@ -1950,6 +1954,7 @@ if(PATH) printf("# autofail end (%d-%d)\n", firstMove, msp);
          case 6: // non-captures\r
            nonCapts = msp;\r
            nullMove = GenNonCapts(oldPromo);\r
+           if(msp == nonCapts) goto cutoff;\r
 #ifdef KILLERS\r
            { // swap killers to front\r
              Move h = killer[level][0]; int j = curMove;\r
@@ -2318,6 +2323,7 @@ Convert (char *fen)
         *p++ = table[2* (*fen - 'A' - n)+1] + n;\r
       }\r
     } else *p++ = *fen;\r
+    if(!*fen) break;\r
     fen++;\r
   }\r
   printf("# converted FEN '%s'\n", fenArray);\r