Bench: 3249278

jhonnold · Oct 21, 2023 · 1b882f9 · 1b882f9
1 parent 4b6b69b
commit 1b882f9
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/src/search.c b/src/search.c
@@ -61,7 +61,7 @@ void InitPruningAndReductionTables() {
     LMP[1][depth] = 2.7002 + 0.9448 * depth * depth;
 
     STATIC_PRUNE[0][depth] = -14.9419 * depth * depth; // quiet move cutoff
-    STATIC_PRUNE[1][depth] = -103.9379 * depth; // capture cutoff
+    STATIC_PRUNE[1][depth] = -103.9379 * depth;        // capture cutoff
   }
 }
 
@@ -279,7 +279,7 @@ void Search(ThreadData* thread) {
       if (thread->previousScore == UNKNOWN)
         searchScoreDiff *= 2, prevScoreDiff = 0;
 
-      double scoreChangeFactor = 0.0995 +                                              //
+      double scoreChangeFactor = 0.0995 +                                           //
                                  0.0286 * searchScoreDiff * (searchScoreDiff > 0) + //
                                  0.0261 * prevScoreDiff * (prevScoreDiff > 0);
       scoreChangeFactor = Max(0.4843, Min(1.4498, scoreChangeFactor));
@@ -655,13 +655,15 @@ int Negamax(int alpha, int beta, int depth, int cutnode, ThreadData* thread, PV*
       // prevent dropping into QS, extending, or reducing all extensions
       R = Min(depth - 1, Max(R, 1));
 
-      score = -Negamax(-alpha - 1, -alpha, newDepth - R, 1, thread, &childPv, ss + 1);
+      int lmrDepth = newDepth - R;
+      score        = -Negamax(-alpha - 1, -alpha, lmrDepth, 1, thread, &childPv, ss + 1);
 
       if (score > alpha && R > 1) {
         newDepth += (score > bestScore + 76);
         newDepth -= (score <= bestScore + 1);
 
-        score = -Negamax(-alpha - 1, -alpha, newDepth - 1, !cutnode, thread, &childPv, ss + 1);
+        if (newDepth - 1 > lmrDepth)
+          score = -Negamax(-alpha - 1, -alpha, newDepth - 1, !cutnode, thread, &childPv, ss + 1);
       }
     } else if (!isPV || playedMoves > 1) {
       score = -Negamax(-alpha - 1, -alpha, newDepth - 1, !cutnode, thread, &childPv, ss + 1);