X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=6a39e688c62e1f5f68ca6ebf648ee78fa01a9124;hp=2b58eda81891fb2c2709e5096fdd1e4889adae91;hb=8631b08d9704dac256462f6b5b885a4d8b0a9165;hpb=3d2aab11d89493311e0908a9ee1a8288b9ff9b42

diff --git a/src/search.cpp b/src/search.cpp
index 2b58eda8..6a39e688 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -116,28 +116,26 @@ namespace {
 
 void Search::init() {
 
-  int d;  // depth (ONE_PLY == 2)
-  int hd; // half depth (ONE_PLY == 1)
-  int mc; // moveCount
-
   // Init reductions array
-  for (hd = 1; hd < 64; ++hd) for (mc = 1; mc < 64; ++mc)
-  {
-      double    pvRed = 0.00 + log(double(hd)) * log(double(mc)) / 3.00;
-      double nonPVRed = 0.33 + log(double(hd)) * log(double(mc)) / 2.25;
+  for (int d = 1; d < 64; ++d)
+      for (int mc = 1; mc < 64; ++mc)
+      {
+          double    pvRed = 0.00 + log(double(d)) * log(double(mc)) / 3.00;
+          double nonPVRed = 0.33 + log(double(d)) * log(double(mc)) / 2.25;
 
-      Reductions[1][1][hd][mc] = int8_t(   pvRed >= 1.0 ?    pvRed + 0.5: 0);
-      Reductions[0][1][hd][mc] = int8_t(nonPVRed >= 1.0 ? nonPVRed + 0.5: 0);
+          Reductions[1][1][d][mc] = int8_t(   pvRed >= 1.0 ?    pvRed + 0.5: 0);
+          Reductions[0][1][d][mc] = int8_t(nonPVRed >= 1.0 ? nonPVRed + 0.5: 0);
 
-      Reductions[1][0][hd][mc] = Reductions[1][1][hd][mc];
-      Reductions[0][0][hd][mc] = Reductions[0][1][hd][mc];
+          Reductions[1][0][d][mc] = Reductions[1][1][d][mc];
+          Reductions[0][0][d][mc] = Reductions[0][1][d][mc];
 
-      if (Reductions[0][0][hd][mc] >= 2)
-          Reductions[0][0][hd][mc] += 1;
-  }
+          // Increase reduction when eval is not improving
+          if (Reductions[0][0][d][mc] >= 2)
+              Reductions[0][0][d][mc] += 1;
+      }
 
   // Init futility move count array
-  for (d = 0; d < 32; ++d)
+  for (int d = 0; d < 32; ++d)
   {
       FutilityMoveCounts[0][d] = int(2.4 + 0.773 * pow(d + 0.00, 1.8));
       FutilityMoveCounts[1][d] = int(2.9 + 1.045 * pow(d + 0.49, 1.8));