Tweak non-captures scoring

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 99f3614d1ea5f27c78d5c53eebb9d2062d69bd68..4d4653bbc2656201aff6ffca454443538145df71 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -214,7 +214,7 @@ namespace {
   int32_t FutilityMarginsMatrix[16][64]; // [depth][moveNumber]
   int FutilityMoveCountArray[32]; // [depth]
 
-  inline Value futility_margin(Depth d, int mn) { return Value(d < 7 * OnePly ? FutilityMarginsMatrix[Max(d, 0)][Min(mn, 63)] : 2 * VALUE_INFINITE); }
+  inline Value futility_margin(Depth d, int mn) { return Value(d < 7 * OnePly ? FutilityMarginsMatrix[Max(d, 1)][Min(mn, 63)] : 2 * VALUE_INFINITE); }
   inline int futility_move_count(Depth d) { return d < 16 * OnePly ? FutilityMoveCountArray[d] : 512; }
 
   // Step 14. Reduced search
@@ -235,7 +235,7 @@ namespace {
   const Value EasyMoveMargin = Value(0x200);
 
   // Last seconds noise filtering (LSN)
-  const bool UseLSNFiltering = false;
+  const bool UseLSNFiltering = true;
   const int LSNTime = 100; // In milliseconds
   const Value LSNValue = value_from_centipawns(200);
   bool loseOnTime = false;
@@ -353,7 +353,7 @@ void init_search() {
   }
 
   // Init futility margins array
-  for (d = 0; d < 16; d++) for (mc = 0; mc < 64; mc++)
+  for (d = 1; d < 16; d++) for (mc = 0; mc < 64; mc++)
       FutilityMarginsMatrix[d][mc] = 112 * int(log(double(d * d) / 2) / log(2.0) + 1.001) - 8 * mc + 45;
 
   // Init futility move count array
@@ -1061,7 +1061,7 @@ namespace {
     Depth ext, newDepth;
     Value bestValue, value, oldAlpha;
     Value refinedValue, nullValue, futilityValueScaled; // Non-PV specific
-    bool isCheck, singleEvasion, moveIsCheck, captureOrPromotion, dangerous;
+    bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous;
     bool mateThreat = false;
     int moveCount = 0;
     int threadID = pos.thread();
@@ -1257,11 +1257,12 @@ namespace {
     // Initialize a MovePicker object for the current position
     MovePicker mp = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta));
     CheckInfo ci(pos);
-    bool singularExtensionNode =   depth >= SingularExtensionDepth[PvNode]
-                                && tte && tte->move()
-                                && !excludedMove // Do not allow recursive singular extension search
-                                && is_lower_bound(tte->type())
-                                && tte->depth() >= depth - 3 * OnePly;
+    singleEvasion = isCheck && mp.number_of_evasions() == 1;
+    singularExtensionNode =   depth >= SingularExtensionDepth[PvNode]
+                           && tte && tte->move()
+                           && !excludedMove // Do not allow recursive singular extension search
+                           && is_lower_bound(tte->type())
+                           && tte->depth() >= depth - 3 * OnePly;
 
     // Step 10. Loop through moves
     // Loop through all legal moves until no moves remain or a beta cutoff occurs
@@ -1274,7 +1275,6 @@ namespace {
       if (move == excludedMove)
           continue;
 
-      singleEvasion = (isCheck && mp.number_of_evasions() == 1);
       moveIsCheck = pos.move_is_check(move, ci);
       captureOrPromotion = pos.move_is_capture_or_promotion(move);