diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 8a21b0bb..daf0c1d7 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -167,13 +167,13 @@ namespace {
   constexpr Score PawnlessFlank      = S( 19, 84);
   constexpr Score RookOnPawn         = S( 10, 30);
   constexpr Score SliderOnQueen      = S( 42, 21);
-  constexpr Score ThreatByKing       = S( 23, 76);
+  constexpr Score ThreatByKing       = S( 22, 78);
   constexpr Score ThreatByPawnPush   = S( 45, 40);
   constexpr Score ThreatByRank       = S( 16,  3);
   constexpr Score ThreatBySafePawn   = S(173,102);
   constexpr Score TrappedRook        = S( 92,  0);
   constexpr Score WeakQueen          = S( 50, 10);
-  constexpr Score WeakUnopposedPawn  = S(  5, 29);
+  constexpr Score WeakUnopposedPawn  = S( 15, 19);
 
 #undef S
 
diff --git a/src/search.cpp b/src/search.cpp
index d98ba4e4..2678f7d5 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -388,7 +388,7 @@ void Thread::search() {
           if (rootDepth >= 5 * ONE_PLY)
           {
               Value previousScore = rootMoves[pvIdx].previousScore;
-              delta = Value(18);
+              delta = Value(20);
               alpha = std::max(previousScore - delta,-VALUE_INFINITE);
               beta  = std::min(previousScore + delta, VALUE_INFINITE);
 
diff --git a/src/types.h b/src/types.h
index 9e0f8c3e..66be460d 100644
--- a/src/types.h
+++ b/src/types.h
@@ -180,7 +180,7 @@ enum Value : int {
   KnightValueMg = 784,   KnightValueEg = 868,
   BishopValueMg = 828,   BishopValueEg = 916,
   RookValueMg   = 1286,  RookValueEg   = 1378,
-  QueenValueMg  = 2528,  QueenValueEg  = 2698,
+  QueenValueMg  = 2529,  QueenValueEg  = 2687,
 
   MidgameLimit  = 15258, EndgameLimit  = 3915
 };