diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 9eebad9e..4667d515 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -158,7 +158,7 @@ namespace {
   constexpr Score BishopPawns        = S(  3,  7);
   constexpr Score CloseEnemies       = S(  6,  0);
   constexpr Score CorneredBishop     = S( 50, 50);
-  constexpr Score Hanging            = S( 52, 30);
+  constexpr Score Hanging            = S( 57, 32);
   constexpr Score HinderPassedPawn   = S(  8,  0);
   constexpr Score KingProtector      = S(  6,  6);
   constexpr Score KnightOnQueen      = S( 21, 11);
@@ -166,7 +166,7 @@ namespace {
   constexpr Score MinorBehindPawn    = S( 16,  0);
   constexpr Score Overload           = S( 13,  6);
   constexpr Score PawnlessFlank      = S( 19, 84);
-  constexpr Score RookOnPawn         = S(  8, 24);
+  constexpr Score RookOnPawn         = S( 10, 30);
   constexpr Score SliderOnQueen      = S( 42, 21);
   constexpr Score ThreatByKing       = S( 23, 76);
   constexpr Score ThreatByPawnPush   = S( 45, 40);
diff --git a/src/search.cpp b/src/search.cpp
index bd5eb260..0f27564a 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -82,7 +82,7 @@ namespace {
   // History and stats update bonus, based on depth
   int stat_bonus(Depth depth) {
     int d = depth / ONE_PLY;
-    return d > 17 ? 0 : 33 * d * d + 66 * d - 66;
+    return d > 17 ? 0 : 29 * d * d + 138 * d - 134;
   }
 
   // Skill structure is used to implement strength limit
@@ -747,7 +747,7 @@ namespace {
     // Step 9. Null move search with verification search (~40 Elo)
     if (   !PvNode
         && (ss-1)->currentMove != MOVE_NULL
-        && (ss-1)->statScore < 22500
+        && (ss-1)->statScore < 23200
         &&  eval >= beta
         &&  ss->staticEval >= beta - 36 * depth / ONE_PLY + 225
         && !excludedMove
diff --git a/src/types.h b/src/types.h
index 175bbbeb..43e9fbff 100644
--- a/src/types.h
+++ b/src/types.h
@@ -182,9 +182,9 @@ enum Value : int {
   VALUE_MATE_IN_MAX_PLY  =  VALUE_MATE - 2 * MAX_PLY,
   VALUE_MATED_IN_MAX_PLY = -VALUE_MATE + 2 * MAX_PLY,
 
-  PawnValueMg   = 171,   PawnValueEg   = 240,
+  PawnValueMg   = 175,   PawnValueEg   = 240,
   KnightValueMg = 764,   KnightValueEg = 848,
-  BishopValueMg = 826,   BishopValueEg = 891,
+  BishopValueMg = 815,   BishopValueEg = 905,
   RookValueMg   = 1282,  RookValueEg   = 1373,
   QueenValueMg  = 2500,  QueenValueEg  = 2670,